CN2781352Y - Portable sample quickly pretreatment device for monitoring environment and food - Google Patents
Portable sample quickly pretreatment device for monitoring environment and food Download PDFInfo
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- CN2781352Y CN2781352Y CN 200520095604 CN200520095604U CN2781352Y CN 2781352 Y CN2781352 Y CN 2781352Y CN 200520095604 CN200520095604 CN 200520095604 CN 200520095604 U CN200520095604 U CN 200520095604U CN 2781352 Y CN2781352 Y CN 2781352Y
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- microprocessor
- temperature sensor
- power supply
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Abstract
The utility model discloses a portable sample quickly pretreatment device for monitoring environment and food, which comprises a microprocessor, a heater, a sample cell, a temperature sensor, a power supply, an input device and an output device, wherein the microprocessor is used for controlling the work of the heater and the temperature sensor and treating input and output signals; the heater is used for heating the sample cell; the temperature sensor is used for detecting temperature signals which are delivered to the microprocessor by the temperature sensor; the input device is used for settings control parameters by users; the output device is used for displaying work information; the power supply is used for supplying the power supply to the whole device. The utility model has the advantages of simple structure, small size, low cost, convenient operation and high automatization; the utility model which is suitable for quick detection on site by non-specialized persons satisfies the needs of quick screening and detection on site.
Description
Technical field
The utility model belongs to environment and Food Monitoring technical field, is specifically related to a kind of by changing the mancarried device that temperature and pressure improves pre-service efficient.The utility model can be used for the pre-service of food and environmental sample, as Subcritical Water Extraction, accelerated solvent extraction and preconditioning technique such as clear up fast.Also be fit to be applied to needs such as environmental monitoring, food safety detection and medicine, chemistry and bioanalysis sample is carried out on-the-spot express-analysis and scientific research field.
Technical background
Food security and problem of environmental pollution have caused people's great attention in recent years.The analysis of contaminant trace species has become the primary and emphasis problem in this field in a large amount of food and the environmental sample, because these sample matrices complexity, testing concentration is low, therefore to obtain data accurately, the analysis result of favorable reproducibility, all must carry out pre-treatment to sample.
At different target analytes and different samples, need to adopt different preconditioning techniques.For the analysis of trace elements such as cadmium, lead in food and the environmental sample, need sample be cleared up usually, wet method that adopts in the conventional art or dry method are cleared up main equipments such as often needing electric hot plate, muffle furnace, and the running time is long, complex steps; The microwave digestion technology that development in recent years is got up, the speed of clearing up is fast, efficient is high, but equipment is comparatively expensive, also can not get widespread use in China; The high-pressure digestion method of Shi Yonging in the past also uses pressure cooker etc. than large equipment usually, does not have special digestion instrument, more is not applicable to the on-the-spot mancarried device of clearing up fast.
The analysis of organic contaminant also is a part and parcel very in environment and the food analysis.Different with the preconditioning technique of ultimate analysis, for the analysis of organic contaminant in the sample, must at first target analytes be extracted from sample, and take corresponding the purification and concentration technique, to improve selectivity, sensitivity and the accuracy of analyzing.Change the preconditioning technique that improves extraction efficiency based on temperature and pressure and comprise Subcritical Water Extraction and accelerated solvent extraction technology etc.Wherein (Subcriticalwater extraction, SBWE) technology is a kind of novel green preconditioning technique that grows up in the environmental analysis field in recent years to Subcritical Water Extraction.This technology adopts water as extractant, under certain pressure, water is heated to 100 ℃ with below the upper critical temperature, change the character such as polarity, surface tension and viscosity of water by changing temperature and pressure, thereby can optionally extract the organic compound of the opposed polarity in the complex sample matrix.With under the normal temperature water is compared as extractant, Subcritical Water Extraction can improve extraction efficiency greatly, shortens the extraction time.This preconditioning technique is studied more in recent years abroad, is mainly used in the analysis monitoring of the organic contaminant in the solid environmental samples such as soil, sediment, and domestic research report is also quite few.The document that this technology is used for food analysis abroad is also few, detects the quick Subcritical Water Extraction technology of residues of pesticides in the fruits and vegetables and the relevant report of device but all also be not used in enzyme inhibition method so far both at home and abroad.The work of existing Subcritical Water Extraction Study on Technology mostly adopts large-scale muffle furnace, gas chromatographic column case as heating arrangement, and adopt the stainless steel extractor as extraction container, perhaps directly adopt expensive overcritical chromatogram or supercritical fluid extraction equipment, wait by adjusting temperature, time or pressure and control and study the Subcritical Water Extraction condition.The various Subcritical Water Extraction methods of reporting in the document all can only be applicable to specific agricultural chemicals, sample and appointed condition, and the instrument that these methods are used costs an arm and a leg, the operation of equipment complexity, need special experimental technique personnel, and can only carry out in self-contained specialty analysis laboratory, can not be applied to market, supermarket etc. needs the scene of fast detecting to use.Up to the present, all also do not have special Subcritical Water Extraction instrument both at home and abroad, do not see the relevant report of the portable subcritical water pretreatment unit that can be used for non-laboratory execute-in-place yet.In addition, for the accelerated solvent extraction technology, external at present existing special extraction equipment, but cost an arm and a leg, be difficult to popularize, yet there are no report for portable heating quick-dissolving agent extraction equipment.
So far, change based on temperature and pressure and the portable quick pretreatment unit that is used for food and environmental monitoring that improves treatment effeciency yet there are no report.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of quick pretreatment unit of portable example that is used for environment and Food Monitoring is provided.This apparatus structure is simple, volume is little, easy to operate, be suitable for layman's fast-field evaluation.
A kind of quick pretreatment unit of portable example that is used for environment and Food Monitoring that the utility model provides, this device comprises microprocessor, well heater, sample cell, temperature sensor, power supply, input media and output unit; Microprocessor is used for control heater and temperature sensor work, and input/output signal is handled; Well heater is used for the sample cell heating, and temperature sensor is used for the temperature signal of working sample, and sends this signal to microprocessor; Input media is used for the user controlled variable is set, and output unit is used to show job information, and power supply is used for the power supply supply of whole device.
Can connect real-time timepiece chip on the above-mentioned microprocessor, nonvolatile memory and RS-serial interface chip are used to realize time keeping, data-storing, PC communication and serial print function.
The utility model is applicable to that environment and food safety monitoring etc. need carry out the quick pretreated occasion in scene to sample.Compare with existing sample pretreatment apparatus, that the utility model device has is simple in structure, volume is little, cost is low, easy to use, automaticity is high, is suitable for layman's fast-field evaluation, satisfies the needs of on-the-spot rapid screening and mensuration.This device can also be applied to the scientific research field based on the preconditioning technique of temperature, pressure change.Particularly, the utlity model has following characteristics:
1) this device can adopt the tool plug can airtight withstand voltage glass test tube as extraction container, cost is low, and is simple to operate, easy to use.
2) this device not only can be used for Subcritical Water Extraction, can also be used for the preconditioning technique research field based on pressure, temperature change such as accelerated solvent extraction, pervaporation technology and Specimen eliminating.
3) this device can be regulated by button temperature and heat time heating time are set, and has functions such as temperature prompt and self-clocking.
Description of drawings
Fig. 1 is the structural representation of the utility model device;
Fig. 2 is the control flow block diagram of the utility model device.
Embodiment
This device comprises microprocessor 1, well heater 2, sample cell 3, temperature sensor 4, power supply 5, input media 6 and output unit 7.Well heater 2 is used for sample cell 3 heating, to improve the temperature of sample in the sample cell 3 interior test tubes.Temperature sensor 4 is used for the temperature signal of working sample, and sends this signal to control device.Microprocessor 1 is used for the work of control heater and temperature sensor, and input/output signal is handled.Test tube can adopt the tool plug can airtight withstand voltage glass test tube.
Microprocessor 1 is by temperature sensor 4, the Current Temperatures in measuring samples pond 3, and, adjust the switching time of well heater 2 according to the difference size of Current Temperatures and preset temperature, thus the control heating power, to guarantee stablizing of temperature.The user by input media 6 can control heater switch, also parameters such as preset temperature, heat time heating time can be set.Information such as the Current Temperatures in output unit 7 direct show sample ponds and heat time heating time.Power supply 5 is responsible for the power supply supply of whole device.
Can also be equipped with real-time timepiece chip (as DS1302), nonvolatile memory (as 24LC64) and RS-232 serial interface chip (as MAX3233) in the above-mentioned control device, thereby can realize functions such as time keeping, data-storing, PC communication and serial print, convenient for users to use.
Above-mentioned each parts all can adopt prior art to be realized, are further described with example below.
We adopt the AT89C2051 single-chip microcomputer of Atmel company as microprocessor, and the switch of well heater receives the PWM pulse-width signal that is sent by microprocessor, the switch of control heater circuit by bidirectional thyristor (as BT136 etc.) control.By changing the dutycycle of pwm signal, realize power adjustments to well heater.Sample cell adopts aluminium alloy to make, and outer setting has eight sample wells to be used to place the pretreatment sample pipe, and heater element and temperature sensor are contained in inside.Heater element directly adopts commercially available heating rod.What temperature sensor adopted is the MF54 type high precision thermosensitive resistor of Gao Li company.The temperature signal that temperature sensor is measured is sent into microprocessor after the AD conversion.
Power supply adopts transformer to add the mode of rectifier bridge, provide Single Chip Microcomputer (SCM) system required+the 5V power supply.Input media can adopt toggle switch and two kinds of forms of button, with user-friendly.Output unit is made up of one 4 LED data pipe, can show current states such as heter temperature, processing time under the control of single-chip microcomputer.
The Control Software of microprocessor can adopt C51 to write, and its process flow diagram as shown in Figure 2.
The using method of the utility model device is as follows:
(1) opens mancarried device, set pretreatment temperature, when sample cell reaches design temperature, can point out by automatic acousto-optic;
(2) can airtight tool plug test tube with putting into glass after the testing sample weighing, add pretreating agent, lid is tightly put into mancarried device, sets the processing time;
(3) after pre-service finished, device stopped heating automatically, will seek out test tube according to analysis and carry out follow-up analytical work.
Adopt the utility model device and two kinds of pretreatment modes using always at present to compare below.
The preprocess method that adopts in National Standard Method GB/T 5009.199-2003 " enzyme of remains of pesticide suppresses method express-analysis standard method in the fruits and vegetables " is manual oscillation extraction, concrete steps are: choose sample 1.0g, be cut into the square fragment in the 1cm left and right sides, put into beaker or extraction flask, add 5mL buffer solution, vibration 1～2min pours out extract, leave standstill 3～5min, stand-by.
In the comparison procedure, select the comparatively stable methamidophos pesticide of character for use, as sample, make analog sample, and adopt enzyme to suppress method, study and set up preconditioning technique as analysis and detection technology with Chinese cabbage.Compare research to all adopting water to carry out Subcritical Water Extraction at first respectively as conventional manual oscillation extraction, ultrasonic extraction and employing the utility model device of extractant.The result is as shown in table 3.
Table 1 contains the Chinese cabbage analog sample pre-service of methamidophos pesticide and compares (n=2)
| Preconditioning technique | Agricultural chemicals aqueous solution inhibiting rate Y0 (%) | Chinese cabbage analog sample inhibiting rate Y1 (%) | The blank inhibiting rate Y10 (%) of Chinese cabbage | Relative percentage extraction Y1/Y0 (%) |
| Direct oscillation extraction ultrasonic extraction Subcritical Water Extraction | 62 64 64 | 25 21 58 | 8 4 11 | 41 33 89 |
Comparative result shows, directly the extraction ratio of oscillation extraction and ultrasonic extraction is all lower, and percentage extraction all is lower than 50% relatively, and the extraction efficiency of Subcritical Water Extraction is higher relatively, percentage extraction reaches 89% relatively, is better than pretreatment modes such as conventional manual vibration and ultrasonic extraction.The Subcritical Water Extraction preconditioning technique of remains of pesticide has advantages such as extraction efficiency height, favorable reproducibility, time be short, easy and simple to handle in the fruits and vegetables that the present invention proposes, suppress fast detection method with enzyme and combine the extraction that can extensively effectively be used for fruits and vegetables sample residues of pesticides, realize the field quick detection of fruits and vegetables sample, compare with traditional approach, improved detection sensitivity and accuracy greatly.
Claims (2)
1, a kind of quick pretreatment unit of portable example that is used for environment and Food Monitoring, it is characterized in that: this device comprises microprocessor (1), well heater (2), sample cell (3), temperature sensor (4), power supply (5), input media (6) and output unit (7); Microprocessor (1) is used for control heater (2) and temperature sensor (4) work, and input/output signal is handled; Well heater (2) is used for sample cell (3) heating, and temperature sensor (4) is used for the temperature signal of working sample, and sends this signal to microprocessor (1); Input media (6) is used for the user controlled variable is set, and output unit (7) is used to show job information, and power supply (5) is used for the power supply supply of whole device.
2, mancarried device according to claim 1, it is characterized in that: above-mentioned microprocessor is connected with real-time timepiece chip on (1), nonvolatile memory and RS-232 serial interface chip are used to realize time keeping, data-storing, PC communication and serial print function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520095604 CN2781352Y (en) | 2005-03-24 | 2005-03-24 | Portable sample quickly pretreatment device for monitoring environment and food |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520095604 CN2781352Y (en) | 2005-03-24 | 2005-03-24 | Portable sample quickly pretreatment device for monitoring environment and food |
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| CN2781352Y true CN2781352Y (en) | 2006-05-17 |
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| CN 200520095604 Expired - Lifetime CN2781352Y (en) | 2005-03-24 | 2005-03-24 | Portable sample quickly pretreatment device for monitoring environment and food |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672736B (en) * | 2009-09-27 | 2013-01-02 | 深圳市农产品股份有限公司 | Sample pre-treatment device for analysis of pesticide residues in fruits and vegetables and analysis of pesticide residues in fruits and vegetables |
| CN103308366A (en) * | 2013-07-01 | 2013-09-18 | 山东省农业科学院中心实验室 | Microminiaturized subcritical water extraction instrument |
| CN104931325A (en) * | 2014-11-14 | 2015-09-23 | 深圳出入境检验检疫局食品检验检疫技术中心 | Method for extracting endocrine disrupter |
| CN105866276A (en) * | 2016-04-07 | 2016-08-17 | 河南城建学院 | Method for simultaneously extracting and purifying plurality of types of chlorinated polycyclic aromatic hydrocarbons in soil |
| CN106370508A (en) * | 2016-09-28 | 2017-02-01 | 北京东航科仪仪器有限公司 | Chemical oxygen demand (COD) digestion instrument |
-
2005
- 2005-03-24 CN CN 200520095604 patent/CN2781352Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672736B (en) * | 2009-09-27 | 2013-01-02 | 深圳市农产品股份有限公司 | Sample pre-treatment device for analysis of pesticide residues in fruits and vegetables and analysis of pesticide residues in fruits and vegetables |
| CN103308366A (en) * | 2013-07-01 | 2013-09-18 | 山东省农业科学院中心实验室 | Microminiaturized subcritical water extraction instrument |
| CN104931325A (en) * | 2014-11-14 | 2015-09-23 | 深圳出入境检验检疫局食品检验检疫技术中心 | Method for extracting endocrine disrupter |
| CN105866276A (en) * | 2016-04-07 | 2016-08-17 | 河南城建学院 | Method for simultaneously extracting and purifying plurality of types of chlorinated polycyclic aromatic hydrocarbons in soil |
| CN105866276B (en) * | 2016-04-07 | 2017-11-14 | 河南城建学院 | A kind of method of a variety of chloro polycyclic aromatic hydrocarbons in synchronous extraction and purification soil |
| CN106370508A (en) * | 2016-09-28 | 2017-02-01 | 北京东航科仪仪器有限公司 | Chemical oxygen demand (COD) digestion instrument |
| CN106370508B (en) * | 2016-09-28 | 2023-05-12 | 北京东航科仪仪器有限公司 | COD digestion instrument |
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| C14 | Grant of patent or utility model | ||
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Expiration termination date: 20150324 Granted publication date: 20060517 |