CN201867391U - Device for qualitatively, quantitatively and fast detecting pesticide residue in site - Google Patents
Device for qualitatively, quantitatively and fast detecting pesticide residue in site Download PDFInfo
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- CN201867391U CN201867391U CN2010206193819U CN201020619381U CN201867391U CN 201867391 U CN201867391 U CN 201867391U CN 2010206193819 U CN2010206193819 U CN 2010206193819U CN 201020619381 U CN201020619381 U CN 201020619381U CN 201867391 U CN201867391 U CN 201867391U
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Abstract
The utility model provides a device for qualitatively, quantitatively and fast detecting pesticide residue in site, which comprises a cavity, wherein a gas inlet, a gas outlet and a gas pump are arranged on the cavity. The utility model is characterized in that a dust filter communicated with the gas inlet is arranged in the cavity, the dust filter is communicated with a suction type ionic migration spectrum measuring device and a photoionization detector, a multi-pole plate is arranged in the suction type ionic migration spectrum measuring device, an ultraviolet lamp, a polarization pole plate and a collection pole are arranged in the photoionization detector, the photoionization detector is communicated with a metal oxide semiconductor gas sensor, and in addition, the multi-pole plate of the suction type ionic migration spectrum measuring device, the collection pole of the photoionization detector, a signal pole of the metal oxide semiconductor gas sensor and the gas pump are electrically connected with a central control processor. Pesticide residue sample gas on articles such as vegetables, fruits and the like is sucked in a smelling way, the sucked gas of objects to be detected can be conveniently, fast and accurately detected in real time without pretreatment and sample preparation to obtain the components and the concentration value of the objects to be detected, fast, reliable and effective assurance is provided for the safety of listed food, and in addition, trace gas of poisonous and harmful substances can be effectively and fast detected.
Description
Technical field
The utility model relates to a kind of Detecting Pesticide device, and especially a kind of on-the-spot qualitative, quantitative carries out the device of fast detecting to pesticide residue, belongs to the detection technique field.
Background technology
The invention of agricultural chemicals and use have improved the output of crops undoubtedly greatly, but a large amount of and use unreasonably of simultaneous agricultural chemicals brings because of the direct healthy negative effect of harm humans of the increase of the persticide residue in the food.Especially in populous China, because of the production, the use present situation that are subject to agricultural chemicals, the average annual agricultural chemicals acute poisoning incident that takes place reaches tens thousand of, is startling.Announce 2010 315 survey reports according to international " Green Peace " environmental protection organization, in 83 vegetables and fruits samples that comprise the sampling of supermarket, South China, all there are problems such as residues of pesticides exceed standard in great majority.Testing result is found, expressing the fresh fruits and vegetables of the supermarket of very big trust buying the public detects and contains the bigger a few class agricultural chemicals of harm to mix residual be a common problem, in residual even comprise that country has prohibited the agricultural chemicals of producing or using, these agricultural chemicals comprise that FAO's suggestion should not be in severe toxicity and the hypertoxic type agricultural chemicals that developing country uses.Agricultural products in China, food production number of the enterprise are big, small scale, dispersion, and ruling by law and self-discipline consciousness are very weak, and populous, consumer groups and channel are also many, thereby have constituted the food-safety problem pilosity.Except the objective factor of environmental protection factor and working condition, come from separated usefulness, abuse mostly to agricultural chemicals, veterinary drug, adjuvant etc.In the control agricultural product one of key link of persticide residue be exactly to persticide residue in the agricultural product in time, analyzing and testing exactly, with the reasonable use of monitoring agricultural chemicals, stop the launch sale that pesticide residue exceeds standard simultaneously.
The method of testing of residues of pesticides can be divided into laboratory conventionally test method and on-the-spot fast determining method two classes on the whole.
Conventional laboratory pesticide residue analysis method of testing has: vapor-phase chromatography (GC), it is the analytical approach that a kind of classics are suitable for, and also is the national standard method that organophosphorus pesticide detects in China.Thin-layered chromatography (TLC), gas chromatography and mass spectromentry method (GC-MS), high performance liquid chromatography (HPLC), liquid chromatography one mass spectroscopy (LC-MS), capillary electrophoresis (CE) etc.The advantage of the laboratory pesticide residue analysis detection method that these are conventional is accurate, various, but shortcoming is that the instrument investment is big, technical level of operators is required high, need carry out complexity, loaded down with trivial details sample preparation in early stage is handled, detection cost height, detection time is long or the like, especially above-mentioned analytical instrument really is used for the less of field quick detection, and supervision work before, during and after the production process has brought many inconvenience to agricultural product to give food safety regulator.Only depend on above-mentioned a series of laboratories detection method and instrument to be difficult in time, to monitor from the source fast and all sidedly the food security situation.The laboratory residual another one advantage of conventional sense farming is: can provide qualitative, the quantitative result of residues of pesticides in vegetables, the fruit, the legal arbitration foundation is provided.
Conventional at present on-the-spot fast determining method mainly contains enzyme and suppresses method, it is the method that is used for detecting organic phosphates and carbamate chemicals for agriculture, it is the technology of utilizing its residual quantity in food, because of this two classes agricultural chemicals can acetylcholine esterase inhibition or the activity of butyrylcholine esterase, promptly when above-mentioned two class agricultural chemicals exist, will produce enzyme and suppress, make its active decline, the color relation of reaction solution can change.Therefore, can draw non agricultural chemical residuum according to change color.This class fast determining method has at short notice can detect great amount of samples, the detection cost is low, less demanding to testing staff's technical merit, be easy to (as: vegetables in basic unit, fruit production base and wholesale market etc.) characteristics such as popularization, can partly satisfy the detection needs of China grass-roots unit to residues of pesticides in the fruits and vegetables, but the Pesticide Residue requirement in the food that its detection sensitivity can not satisfy China 2005 and European Union issued in 2004, difficult point is summed up as follows: sample substrate background complexity, the pre-treatment process is loaded down with trivial details, remains of pesticide is the trace concentration level, the detectability of analytical instrument is low, the instrument detecting insufficient sensitivity, be only limited to the detection of organophosphorus and carbamate chemicals for agriculture, and can not provide qualitative, detection by quantitative result, detect and only limit the Pesticide Residue standard value that generally is higher than international and domestic regulation, therefore can not be as the legal arbitration foundation.
Summary of the invention
Detection is difficult to be directly used in field quick detection at existing laboratory pesticide residue analysis; Though and conventional enzyme inhibition method can be carried out scene speed survey, but can only detect organophosphorus and carbamate chemicals for agriculture, other class agricultural chemicals then can't detect, simultaneously, can not provide problems such as qualitative and quantitative analysis result, it can be media with residual escaping gas of farming or steam that the utility model provides a kind of, need not to carry out the pre-service sample preparation, just can be quickly and easily at the scene qualitative, quantitative detect the device of residues of pesticides in real time.
The utility model provides a kind of like this device of on-the-spot qualitative, quantitative fast detecting pesticide residue thing, comprise and bring gas port on it into, the cavity of gas outlet and air pump, it is characterized in that being provided with in the cavity dust filter that is communicated with air intake opening, dust filter with its in be provided with multipole plate suction-type ion migration survey the spectrum device and be communicated with, dust filter also with its in be provided with uviol lamp, the photoionization detector of polarization pole plate and collector is communicated with, photoionization detector is communicated with the metal-oxide semiconductor (MOS) gas sensor, and the multipole plate of spectrum device is surveyed in the migration of suction-type ion, the collector of photoionization detector, the pickup electrode of metal-oxide semiconductor (MOS) gas sensor, air pump is electrically connected with central control processor.
Described suction-type ion migration is surveyed the spectrum device and is comprised the chamber of bringing gas port and gas outlet on it into, be provided with the chamber of band radiation source in the chamber, the ion migration groove that is communicated with chamber, upper and lower two parallel plate electrodes of ion migration groove are respectively equipped with many to electrode pair, be provided with the detecting amplifier that one group of electricity is isolated on electrode pair, the data acquisition unit of the single-chip microcomputer in detecting amplifier and the central control processor is electrically connected.
Described photoionization detector comprises that its underpart establishes window, the photoionization chamber of polarization pole plate and collector is established on top, be provided with vacuum UV lamp on the cavity of described this window correspondence, the collector on photoionization chamber top is electrically connected by the data acquisition unit of the single-chip microcomputer in micro current amplifier and the central control processor.
Described metal-oxide semiconductor (MOS) gas sensor adopts with tungstic acid WO
3For the gas sensor on basis with tin ash SnO
2Be the gas sensor on basis, the data acquisition unit of the single-chip microcomputer in its signal level and the central control processor is electrically connected.
Described central control processor comprises single-chip microcomputer, the power-supply controller of electric that links to each other with single-chip microcomputer, pattern-recognition database, storer, operation and display screen, communication interface.
The utility model adopts the migration of suction-type ion to survey spectrum device, photoionization detector, these three kinds of different gas detection technologies of metal-oxide semiconductor (MOS) gas sensor, and analyze residues of pesticides gas with parallel function mode, the complementation of integrated a plurality of sensors on identical platform, and the chief who gives full play to each technology, can provide higher accuracy than any single sensor, reduce wrong report.
The principle method of suction-type ion migration survey spectral technology and photoionization detection technique all is similar to the principle and the method for laboratory conventionally test instrument, and the pre-treatment sample preparation of having save very complicated, detection sensitivity and degree of accuracy are not failed in laboratory conventionally test method; Suppress agricultural residual rapid method with enzyme and compare, abandoned all enzyme is suppressed the disturbing effect factor of agricultural residual rapid method, need not sample preparation just realize directly detection; It is highly sensitive that this method possesses residues of pesticides, fast speed, the on-the-spot technical foundation that detects in real time.
Inner air pump sucks ambient air and offers sensor groups, comprises ion mobility spectrometry groove (IMS) in the sensor groups, the gas sensor (MOS) of a photoionization detector (PID) and array.This device can be a media with residual escaping gas of farming or steam, realizes need not the on-the-spot quickly and easily detection in real time of pre-service sample preparation.Technical feature is better than fast detecting " enzyme inhibition method " national standard, realize a kind of sample preparation that need not, directly " hear, smell " the super-sensitive high speed detector of qualitative, quantitative that sample can be proved conclusively, realize the scene check and analysis real-time of poisonous and harmful substance trace trace gas such as organic class agricultural chemicals, instrument has extremely low cost when recycling and work.Adopt IMS/MOS/PID three to integrate and integratedly will bring up the serial instrument of brand-new generation residues of pesticides qualitative and quantitative detection.
The utility model is based on following technology:
1, the spectrometry detection technique is surveyed in the ion migration
Spectrum detection technique---IMS technology is surveyed in ion migration, has ionization under atmospheric pressure, and the ion that produces with air medium or the mobility of ion cluster is analyzed under the environment temperature around.Ion mobility spectrometry is measured by a plurality of electric fields, and its selectivity is by quality and two parameter decisions of electric charge of ion.The air-flow of the ion of flowing through migration groove is continuous.Induction type IMS is classified in open loop IMS (open loop IMS), its characteristic and equipment and the technology approved as: mass spectrometry (MS) or gas chromatography/mass spectrometry analytic approach (GC/MS) relatively, the consideration (size, weight and power standard) of characteristic of IMS inherence (splendid sensing range) and practicality makes it form the upsurge of one research and development application.When detection sample gas enters instrument, less in radiation source harm
241Produce ion and electronics under the intensifying of Am α radiation source, form ion flow.Under the acting in conjunction of air-flow and electric field, ion flow shows the ion migration dactylogram signal of corresponding related substances in the different spaces of ion migration groove, have uniqueness and repeatability between these " dactylogram signals " and the object, after the standard spectrum of storage carries out pattern-recognition and calculating in advance in detected " dactylogram " signal and the instrument, can distinguish kind, character and the summary concentration value of on-the-spot material gas.
Detecting device is continuously sampled to atmospheric environment in the IMS technology, gas sample is by the flow rate suction detecting device of transfer air pump with per minute 1～2L, after ionization, the ion flow continuous flow that produces enters a groove shape orthogonal electric field, in this electric field, ion flow with mass-to-charge ratio different produce deflection and by multi-electrode to collecting respectively.The ion flow mass-to-charge ratio has higher mobility when low, and the migration rate when higher with the ion flow mass-to-charge ratio is compared many soon.The ion migration channel mould piece of 16 passages is by the sample composition of interelectrode multistage electric field separates ionization, and sample composition is that quality, carried charge, the affinity according to ionic group obtains separating in multistage electric field.After the processing of 16 channel ions migration groove, each chemical constitution that need analyze all has its specific ' fingerprint ' collection of illustrative plates.Usually, the output packet in channel contains the information of ion mobility and ion polarity.In all individual total channels, can provide the real-time summary value of an IMS response usually.Program process was formed when spectrometry was surveyed in ion migration by control and two.Here it is:
A) ionization of gaseous state realizes exchange or ion---molecular reaction by collision in the air under atmospheric pressure
B) evaluation of ion is the migration of gaseous state ion flow in a faint electric field, and IMS utilizes Chemical Decomposition as its base form.
This suction-type detecting device is very sensitive, and response speed is fast, and simple in structure.For the terminal user, advantage such as reliable, easy to use and low life cycle costing is the advantage of this sensor.
2, photoionization detector technology
The work of photoionization detection technique---PID technology is equally based on electrochemical principle.That is, material molecule can be with positive and negative charge, thereby can form electric current.The Response Mechanism that it has been generally acknowledged that PID is that the compound that ionization potential is equal to or less than luminous energy sends photoionization in gas phase.The ionization of different compounds needs different energy, makes the energy size of specific compound ionization be called the ionization potential (IP) of this material, and (eV) measures with electron-volt.Ultraviolet light source sends the photon stream of certain wavelength, injects ionization chamber through window, if the ionization potential of carrier gas molecules is higher than luminous energy, then is not ionized.The component that is equal to or less than luminous energy when ionization potential enters ionization chamber, and direct or indirect photoionization promptly takes place.
The PID technology can accurately be measured 1ppb (10
-9) to 10000ppm (10
-2) volatile organic compound (be called for short VOC) and the concentration of other toxic gas, be a kind of super-sensitive wide spectrum detecting device, it can detect the most volatile organic compounds and the concentration of other residues of pesticides; But PID can not provide information qualitatively, and it is a kind of detecting device of small and exquisite, continuous coverage, with the auxiliary detection by quantitative of finishing respective substance.
Outstanding feature of photoionization be exactly gas detected after, ion is combined into original gas and steam again, promptly it is not disruptive detecting device.Popular theory, PID is exactly a portable chromatogram that does not have chromatographic column.
Photoionization detector uses the vacuum UV lamp with specific ionization energy (as 10.6eV) to produce ultraviolet source, in ionization chamber, gas molecule is bombarded, the organic molecule ionization that contains in the gas is smashed into the ion and the electronegative electronics of positively charged, under the electric field action of polarization pole plate, ion and electronics clash into to pole plate, thereby form the faint gas current that can be detected.These ion current signals are collected the data acquisition mouth of directly sending into single-chip microcomputer after utmost point collection send micro current amplifier to amplify, by the analysis and Control platform measurement result are analyzed and are handled.Particular circuit configurations mainly is made up of several parts such as uviol lamp, photoionization chamber, micro current amplifier and data acquisitions as shown in Figure 1.Its detection sensitivity is than the about order of magnitude of IMS skill upgrading, its volume is small and exquisite, in light weight, response speed fast (the several seconds utmost point), the pump suction type operation, detect kind many (can detect most volatile organic compound), sensing range wide (from 1ppb-1000ppm), detect data accurate (measuring accuracy is better than 10%), detect in real time, convenient and reliable operation owing to can detect the volatile organic compounds of extremely low concentration and other toxic gas, thereby detects the PID with high sensitivity to volatile organic compounds and in all kinds of processing of residues of pesticides incomparable superiority is arranged.
3, metal-oxide semiconductor (MOS) gas sensor technology
The metal-oxide semiconductor (MOS) gas sensor is by with WO
3(tungstic acid) and SnO
2(tin ash) is the gas sensitization layer on basis; Behind the surface adsorption sample gas molecule of metal-oxide semiconductor (MOS) detection cell, can change its resistance value.The resistance change that produces causes the variation of this sensor signal output.
With WO
3MOS mini type gas sensor for the basis: in semiconductor gas sensor, with WO
3Be the MOS micro-gas sensors on basis, organic sulfide and poisonous mercaptan are had fabulous sensitivity.Phosphorated agent had the highest sensitivity, to the extraordinary selectivity of response tool of highly volatile organic chaff interference minimum and response fast, fast quick-recovery and low drift.Be used for diagnosis and concentration monitor.
With SnO
2MOS mini type gas sensor for the basis: in semiconductor gas sensor, with SnO
2For the MOS micro-gas sensors on basis is the sensitiveest and tool sensor optionally at phosgene class organic synthesis raw material tool.Its functionality can be made by different gas sensitization raw materials.
The semiconductor gas sensor quantity that increases or to change wherein a kind of research focus of these existing sensors be to improve detecting device detecting and the performance of identification chemical substance.This function is carried among the IMS and PID sensor assembly of detecting device, combine with semiconductor transducer and software database, for the hazardous accidents that various harmful chemical caused, detecting device all can carry out in advance and the first-hand analysis of rapid chemical detection and Identification afterwards.
4, software arrangements:
The built-in analysis software that is simple and easy to usefulness of Fast Determination of Pesticide Residue device, recognition objective compound automatically.
Because the Fast Determination of Pesticide Residue device has been integrated temperature, humidity, pressure and flow sensor have adopted the recognizer that obtains approval through test, make apparatus have pinpoint accuracy and self-diagnostic function, adapt to the change of outdoor condition and the compensation of less misoperation.
The signal that each sensor produces calculates via signal processing algorithm, and this algorithm has utilized the decision making function of study vector quantization network and " fuzzy logic " technology.This intelligentized signal processing system has improved the accuracy and the antijamming capability that detect greatly.
New material to be detected can be added in the open type data storehouse.
Integrate integrated employing IMS/MOS/PID synthetic technology, realize the on-the-spot qualitative and quantitative analysis of poisonous and harmful substance trace gas such as residues of pesticides, this integrate innovations combination has much achievement the of new generation on-the-spot Detecting Pesticide device of market potential.
5, Detecting Pesticide principle
The Fast Determination of Pesticide Residue device is primarily aimed at the Synthetic Organic Chemistry agricultural chemicals, and such agricultural chemicals is synthetic by artificial development, and a class agricultural chemicals of being produced by chemical industry, it is various in style (commonly used about 300 kinds) applied range, drug effect height.Its residues of pesticides mainly can be divided into by chemical constitution: organophosphorus (phosphine), four big classes such as carbamate, pyrethroid, organochlorine compound.Wherein, organophosphorus pesticide since its drug effect height, toxicity big, be easy to be degraded, characteristics such as broad spectrum activity, become the kind of present pesticide producing tonnage maximum.Organophosphorus insecticide is to produce both at home and abroad at present and use maximum pesticide species, accounts for 70% of agricultural chemicals main body.The general general formula of organophosphorus pesticide can be expressed as:
X is an acyl group in the formula, is the negative ion of multiple tool acid compound, and the common form of X is " OR " or " SR ", and wherein R is for complicated or have substituent alkyl and a heterocyclic radical.Acyl group is the acidic-group in the organophosphorus pesticide molecule, and " P-X " key is an anhydride bond.R1 is alkoxy commonly, and R2 is alkoxy, alkylamino radical, amino, alkyl etc. commonly.Finished product has DDVP, acephatemet, orthene, Rogor, flolimat, parathion, parathion-methyl etc.
Other class agricultural chemicals is similar to it, and its general structure is respectively arranged, and the utility model patent is promptly with organophosphorus (phosphine), and carbamate, pyrethroid, organochlorine compound four big class agricultural chemicals are divided into four databases.
6, spectrometry technical operations mode is surveyed in the migration of suction-type ion
The power-on instrument self checking places instrument air intake opening place with article such as vegetables to be detected, melons and fruits after entering " standby " test mode, with the sample mode of " hear, smell " the sample aspiration is gone in the dust chamber, sucks chamber after the filtration successively, and is less in harm
241Sample gas is ionized the realization ion-molecule reaction and produces ion flow under the intensifying of Am α radiation source.Ion flow enters the ion migration groove between the two parallel plates, under the low voltage electric field effect vertical with ion flow, ion flow produces different movement velocitys because of the mass-to-charge ratio difference in ion migration groove, cause ion flow to produce deflection, after flowing through certain distance, final arrival is on earthy electrode pair pole plate under effect of electric field; On pole plate, arrange the detecting amplifier that one group of electricity is isolated, record clashes into amount of ions in the above respectively, thereby on different electrode pairs, demonstrate the ion migration dactylogram signal of tie substance, have uniqueness and repeatability between these " dactylogram signals " and the object, gather these " dactylogram " signals by electrode pair, and " dactylogram " signal conveys of being gathered is arrived signal processor.This suction-type ion migration is surveyed the spectrometry technology and is not established the ion fence gate, and whole air-channel system is in open state, and the characterization of ion is carried out continuously, and the ion in all migrations is also got off by continuous recording, so the utilization factor of ion is very high.
7, photoionization detector technical characteristic and function mode
The PID technology is similar to the IMS sensor at the extensive use of the residual detection range of farming.PID is operated in the ionization voltage (IP) that 10.6eV exists, and continuously detects when being lower than photoionization uviol lamp energy.Since response characteristic and high linearity that PID gives, after the Preliminary Identification of successively atmospheric surveillance, but the level of its quantised samples gas.Even the ionization voltage of some sample gas (IP) surpasses 10.6eV and causes the PID technology not detect, and the response of IMS and/or MOS array also can provide detectability.
If adopt the PID technology can effectively detect residues of pesticides, the ionization voltage (IP) that promptly means it is less than 10.6eV, and its absolute concentration is also informed demonstration (unit adopts part per billion, i.e. the ppb value).In addition, the quantitative identification of residues of pesticides will continuously carry out, and selects to stop to analyze and to the processing of removing contamination of this unit up to the user.
8, metal-oxide semiconductor (MOS) gas sensor function mode
Before the gas that detects a kind of low concentration that exists, each sensor all is a nonspecific unit in the MOS array.Yet the function mode of the MOS array in detecting device produces a kind of half clear and definite signal mode to certain interested residues of pesticides.When instrument was sampled, the valve of MOS cavity was opened, and array effectively detects.After a kind of gas detection, valve closing and sensor array pattern are analyzed it.When entering next identification, valve reopens, and array is removed contamination and totally entered the next round sampling.
Detecting device adopts the modular construction form to form, and mainly (contains the lithium ion battery group by power supply, AC external power supply and DC external power interface are formed), detecting unit (contains suction-type open loop ion mobility spectrometry sensor, photoionization detector and thick-film type metal-oxide semiconductor (MOS) gas sensor array), the analysis and Control platform (contains the CPU single-chip microcomputer, the pattern-recognition database, keyboard and storer), Temperature Humidity Sensor, the binary channels air-channel system, (OLED display screen) alarm indication of sound (Microspeaker) screen, RS232 or RS485 communication interface etc. and annex are formed.The main detection by the synthetic Synthetic Organic Chemistry agricultural chemicals of artificial development, by its residues of pesticides chemical constitution composition, as: organophosphorus (phosphine), four big classes such as carbamate, pyrethroid, organochlorine compound are compiled the storehouse, do not need complicated loaded down with trivial details pre-service sample making course in early stage, with the direct identification that realizes trace or the trace escaping gas or the steam of article residues of pesticides such as vegetable melon and fruit of the sample mode of " hear, smell ", exceed threshold value and realize voice and screen display warning.Detecting device is hold by one hand operation, have simple in structure, volume is little, (being up to 1ppb) in light weight, low in energy consumption, highly sensitive, analysis time fast and atmospheric pressure characteristics such as work down; Result of detection is stored the back automatically and is connected relevant device may observe analysis, printable by communication interface.The complete machine price is suitable, without other consumables, detects consuming cost and almost can ignore except dust filter, conveniently is used for: wholesale fruit and vegetable market, the market of farm produce or supermarket, field etc. are on-the-spot to be detected.Operation does not need professional and professional training, only needs routine training to detect by the normal running instrument.
The utlity model has following advantage and effect: adopt such scheme, can make things convenient for, fast, gas to the detected material that sucks detects in real time exactly, immediately can obtain the checking matter composition, concentration value, need not to carry out the pre-service sample preparation, especially when detecting residues of pesticides, only need simply with vegetables to be detected, article such as melon and fruit place the air intake opening place of the utility model device, gas sampling mode with " hearing; smell " is gone into the sample aspiration, can draw residues of pesticides composition and residual quantity from display screen, for the listing food security provides quick, reliably, effectively ensure, stop the pesticide residue food list marketing that exceeds standard, ensure that people's is healthy.The utility model not only can detect residues of pesticides, also can carry out the trace gas of poisonous and harmful substance effectively, fast detecting, so its accommodation is very wide, operate very simple, easy to carry, can continuous detecting, be a kind of of new generation on-the-spot Detecting Pesticide device that has much market potential.
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the theory diagram of the utility model;
Fig. 3 is the operating process synoptic diagram of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further.
The device of the on-the-spot qualitative, quantitative fast detecting pesticide residue that the utility model provides, comprise that trappings have air-flow switching visible marking's rain cover 1, so that still can valid function, under the instrument off working state, instrument internal be implemented effectively protection simultaneously at rainy weather.Detected gas enters the cavity 36 that its enhanced type ABS engineering plastics plastic compression of bringing gas port 2 and gas outlet 21 into is made from rain cover 1 side, be provided with the flow measurement that is communicated with air intake opening 2 and regulator 3 influx in the cavity 36 with gas under control sample gas and the cleaning ambient, flow measurement and regulator 3 are communicated with thereafter dust filter 4, dust filter 4 has two gas circuit outlets of filtering dust and part steam, wherein gas circuit outlet is communicated with suction-type ion migration survey spectrum device, described suction-type ion migration is surveyed the spectrum device and is comprised the cavity of bringing gas port and gas outlet on it into, the air intake opening of cavity is communicated with dust filter 4, the cavity gas outlet is communicated with air pump 17, be provided with the chamber 8 of band radiation source 9 in the cavity, chamber 8 is communicated with ion migration groove 13, on the ion migration groove 13, following both sides are respectively equipped with the parallel plate electrode of electrode pair 22 being made of many, the electronegative potential pole plate that is positioned at downside is provided with the detecting amplifier 23 that electricity is isolated, and detecting amplifier 23 is electrically connected with the data acquisition unit of single-chip microcomputer 12; Detected sample gas exists
241Be ionized under the intensifying of Am α radiation source 9 and produce ion flow, ion flow enters the ion migration groove 13 between the parallel plate, be under the acting in conjunction of low voltage electric field 15 of plumbness with air-flow, ion flow produces different movement velocitys because of the mass-to-charge ratio difference in ion migration groove 13, cause ion flow to produce deflection, through after certain distance, be on electrode pair 22 pole plates of electronegative potential final arrival under the effect of electric field 15; On pole plate, arrange the detecting amplifier 23 that one group of electricity is isolated, record clashes into amount of ions in the above respectively, thereby on different electrode pair 22, demonstrate the ion migration dactylogram signal of tie substance, have uniqueness and repeatability between these " dactylogram signals " and the object, gather also the data acquisition mouth of these " dactylogram " signal conveys of amplifier 23 amplifications after testing by electrode pair 22, measurement result is analyzed and handled by the analysis and Control platform to single-chip microcomputer 12; Another gas circuit outlet 35 of dust filter 4 is communicated with photoionization chamber 32 by temperature sensor 34, three-way solenoid valve 33, a window is established in photoionization chamber 32 bottoms, the cavity 36 corresponding with this window is provided with vacuum UV lamp 31, photoionization chamber 32 tops are provided with polarization pole plate 30 and collector 29, and collector 29 is electrically connected with the data acquisition unit of single-chip microcomputer 12 by micro current amplifier 28; Detected sample gas is through temperature sensor 34 first detected temperatures values, go into photoionization chamber 32 by three-way solenoid valve 33 is laggard again, under the ultraviolet source bombardment that vacuum UV lamp 31 outside photoionization chamber 32 windows produces, the organic molecule ionization that contains in photoionization chamber 32 gases is smashed into the ion and the electronegative electronics of positively charged, under the electric field action of polarization pole plate 30, ion and electronics clash into to pole plate, thereby form the faint gas current that can be detected, these ion current signals are collected the data acquisition mouth of directly sending into single-chip microcomputer 12 after the utmost point 29 collections send micro current amplifier 28 to amplify, by the analysis and Control platform measurement result are analyzed and are handled; Ion flow after photoionization detector detects is compound again to be provided with metal-oxide semiconductor (MOS) gas sensor array 27,26 for entering behind original gas and the steam, and described metal-oxide semiconductor (MOS) gas sensor adopts with tungstic acid WO
3For the gas sensor 27 on basis with tin ash SnO
2Gas sensor 26 for the basis, the signal that described temperature sensor 34, metal-oxide semiconductor (MOS) gas sensor 27,26 and humidity sensor 25 are gathered is all sent into the data acquisition mouth of single-chip microcomputer 12, by the analysis and Control platform measurement result is analyzed and is handled.Wherein, solenoid valve 33 " sample gas " when detected state is logical, recurrent state in " cleaning gas " logical a kind of recovers normally to enter " standby " detected state to impel air-channel system when purging the cleaning state, two-way gas converge the back by air pump 17 by exhausr port 21 discharges;
The utility model device adopts modular construction to form, and the analysis and Control stage apparatus is the control maincenter of instrument on instrument top, is made up of single-chip microcomputer 12, pattern-recognition database 14, keyboard 10 and storer 16.All information send single-chip microcomputer 12 identifications, after data processing such as the 14 pre-deposit data contrasts of pattern-recognition database, identification, if the super pre-set threshold of detectable concentration, one the tunnel enters storer 16 stores, and another road sends audio alert by keyboard display controller 5 driving Microspeakers 6 and display screen 7 shows that directly the qualitative title and the measuring accuracy of affiliated residues of pesticides are better than 10% parameters such as concentration value.Storer 16 storage datas can be consulted on this device display screen 7 or be transferred on the external device (ED) by communication interface 18 and analyze or print by operating in of keyboard 10.Power module is placed in the instrument bottom, and by lithium ion battery 24, external power supply: by the AC220V of adapter, the open-air vehicle-mounted interface 20 of 50Hz interface 19 or DC24V is formed, as Fig. 1, Fig. 2.
During work: rain cover 1 rotated to an angle realize that gas circuit connects, power-on switch 11, observing display screen 7 treats to pass through keyboard 10 choice menus behind the System self-test steady air current, use signal check device simulation test, treat after " recovery " enters the standby test mode article such as detected vegetables, melon and fruit to be placed rain cover 1 side-inlet 2 places, promptly the gas on vegetables, melon and fruit surface is sucked after dust filter 4 filters dust and part steam and enter two paths simultaneously in the gas sampling mode of " hear, smell ", wherein one the road suck chamber 8, less in harm
241The sample air-flow is ionized and produces ion flow under the intensifying of Am α radiation source 9, ion flow sucks in the ion migration groove 13, under the low voltage electric field effect that is provided with, ion flow produces deflection because of the mass-to-charge ratio difference in ion migration chamber 13, collect through electrode pair 22, through detecting amplifier 23 processing and amplifying independently separately, thereby on different electrode pairs, demonstrate the ion migration dactylogram signal of tie substance, after sending the analysis and Control platform to discern and calculate these " dactylogram " signals, can draw kind, character and the summary concentration value of tested gas; Simultaneously again with reference to the sample gas of second gas circuit outlet 35 through temperature sensor 34 detected temperatures values, go into photoionization chamber 32 at detection-phase by three-way solenoid valve 33 is laggard, under the ultraviolet source bombardment that vacuum UV lamp 31 produces, in the ionization chamber 32 the organic molecule ionization that contains in the gas is smashed into the ion and the electronegative electronics of positively charged, under the electric field action of polarization pole plate 30, ion and electronics clash into to pole plate, thereby form the faint gas current that can be detected; These ion current signals are collected and promptly draw more accurate quantitative values after the utmost point 29 collections send micro current amplifier 28 to amplify, and send into the data acquisition mouth of single-chip microcomputer 12, by the analysis and Control platform measurement result are analyzed and are handled; Through collecting tungstic acid WO
3Gas sensor 27 and tin ash SnO
2After the test data of gas sensor 26, send the data acquisition mouth of single-chip microcomputer 12; Through to the comparison identification of three class sensors, and with data processing such as the 13 pre-deposit data contrasts of pattern-recognition database, coupling after, can draw the kind, character of tested gas and concentration value more accurately; Thereby realize qualitative and quantitative detection vegetables, melon and fruit surface residues of pesticides composition and residual quantity.Operation steps sees Fig. 3 for details.
Claims (5)
1. the device of an on-the-spot qualitative, quantitative fast detecting pesticide residue thing, comprise and bring gas port on it into, the cavity of gas outlet and air pump, it is characterized in that being provided with in the cavity dust filter that is communicated with air intake opening, dust filter with its in be provided with multipole plate suction-type ion migration survey the spectrum device and be communicated with, dust filter also with its in be provided with uviol lamp, the photoionization detector of polarization pole plate and collector is communicated with, photoionization detector is communicated with the metal-oxide semiconductor (MOS) gas sensor, and the multipole plate of spectrum device is surveyed in the migration of suction-type ion, the collector of photoionization detector, the pickup electrode of metal-oxide semiconductor (MOS) gas sensor, air pump is electrically connected with central control processor.
2. the device of on-the-spot qualitative, quantitative fast detecting pesticide residue thing as claimed in claim 1, it is characterized in that described suction-type ion migration survey spectrum device comprises the chamber of bringing gas port and gas outlet on it into, be provided with the chamber of band radiation source in the chamber, the ion migration groove that is communicated with chamber, upper and lower two parallel plate electrodes of ion migration groove are respectively equipped with many to electrode pair, be provided with the detecting amplifier that one group of electricity is isolated on electrode pair, the data acquisition unit of the single-chip microcomputer in detecting amplifier and the central control processor is electrically connected.
3. the device of on-the-spot qualitative, quantitative fast detecting pesticide residue thing as claimed in claim 1, it is characterized in that described photoionization detector comprises that its underpart establishes window, the photoionization chamber of polarization pole plate and collector is established on top, be provided with vacuum UV lamp on the cavity of described this window correspondence, the collector on photoionization chamber top is electrically connected by the data acquisition unit of the single-chip microcomputer in micro current amplifier and the central control processor.
4. the device of on-the-spot qualitative, quantitative fast detecting pesticide residue thing as claimed in claim 1 is characterized in that described metal-oxide semiconductor (MOS) gas sensor is WO
3Gas sensor and SnO
2The data acquisition unit of the single-chip microcomputer in the gas sensor, the signal level of two elements and central control processor is electrically connected.
5. the device of on-the-spot qualitative, quantitative fast detecting pesticide residue thing as claimed in claim 1, it is characterized in that described central control processor comprises single-chip microcomputer, the power-supply controller of electric that links to each other with single-chip microcomputer, pattern-recognition database, storer, operation and display screen, communication interface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206193819U CN201867391U (en) | 2010-11-23 | 2010-11-23 | Device for qualitatively, quantitatively and fast detecting pesticide residue in site |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206193819U CN201867391U (en) | 2010-11-23 | 2010-11-23 | Device for qualitatively, quantitatively and fast detecting pesticide residue in site |
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| CN201867391U true CN201867391U (en) | 2011-06-15 |
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| CN2010206193819U Expired - Lifetime CN201867391U (en) | 2010-11-23 | 2010-11-23 | Device for qualitatively, quantitatively and fast detecting pesticide residue in site |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128877A (en) * | 2010-11-23 | 2011-07-20 | 云南无线电有限公司 | Device for qualitatively, quantitatively and quickly detecting pesticide residue on site |
| CN102854237A (en) * | 2011-06-30 | 2013-01-02 | 李德和 | On-site intelligent fast real-time detector of residue of beta-adrenalin receptor agonist adopting ion mobility spectrometry |
| CN103592337A (en) * | 2013-11-19 | 2014-02-19 | 山东理工大学 | Pesticide multiresidue detection method based on array type sensor |
| CN103675081A (en) * | 2012-09-13 | 2014-03-26 | 中国科学院大连化学物理研究所 | Method for quickly and sensitively detecting pesticide residues on surfaces of fruits and vegetables |
| CN103808792A (en) * | 2014-02-19 | 2014-05-21 | 中国农业科学院农业质量标准与检测技术研究所 | Ionic migration spectrum-based method for performing aided inspection on isocarbophos, moncrotophos and/or phosphamidon in cowpea |
-
2010
- 2010-11-23 CN CN2010206193819U patent/CN201867391U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128877A (en) * | 2010-11-23 | 2011-07-20 | 云南无线电有限公司 | Device for qualitatively, quantitatively and quickly detecting pesticide residue on site |
| CN102128877B (en) * | 2010-11-23 | 2013-01-23 | 云南无线电有限公司 | Device for qualitatively, quantitatively and quickly detecting pesticide residue on site |
| CN102854237A (en) * | 2011-06-30 | 2013-01-02 | 李德和 | On-site intelligent fast real-time detector of residue of beta-adrenalin receptor agonist adopting ion mobility spectrometry |
| CN103675081A (en) * | 2012-09-13 | 2014-03-26 | 中国科学院大连化学物理研究所 | Method for quickly and sensitively detecting pesticide residues on surfaces of fruits and vegetables |
| CN103592337A (en) * | 2013-11-19 | 2014-02-19 | 山东理工大学 | Pesticide multiresidue detection method based on array type sensor |
| CN103808792A (en) * | 2014-02-19 | 2014-05-21 | 中国农业科学院农业质量标准与检测技术研究所 | Ionic migration spectrum-based method for performing aided inspection on isocarbophos, moncrotophos and/or phosphamidon in cowpea |
| CN103808792B (en) * | 2014-02-19 | 2016-06-29 | 中国农业科学院农业质量标准与检测技术研究所 | A kind of based on the method for isocarbophos, Azodrin and/or phosphamidon in the auxiliary detection Semen vignae sinensis of ion mobility spectrometry |
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