CN203772734U - Detection device for detecting nitrite concentration by using laser - Google Patents
Detection device for detecting nitrite concentration by using laser Download PDFInfo
- Publication number
- CN203772734U CN203772734U CN201420121214.XU CN201420121214U CN203772734U CN 203772734 U CN203772734 U CN 203772734U CN 201420121214 U CN201420121214 U CN 201420121214U CN 203772734 U CN203772734 U CN 203772734U
- Authority
- CN
- China
- Prior art keywords
- laser
- concentration
- cuvette
- nitrite
- sample
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model discloses a detection device for detecting nitrite concentration by using laser. The detection device comprises a light source system, a cuvette, a sample cell, a silicon photocell and a voltage meter, wherein the cuvette is filled with a sample and a color developing agent; the light source system emits monochromatic laser, and the monochromatic laser transmits through the cuvette placed in the sample cell, is received by the silicon photocell for converting an optical signal into an electric signal; the electric signal is transmitted to the voltage meter; the concentration of nitrite in the sample is obtained through a linear regression equation for comparing the variation of voltage with the concentration of nitrite. The detection device is resistant to shock, durable and easy to maintain; by adopting 532nm laser and the silicon photocell which are low in prices, the cost is reduced greatly; the detection device has a simple internal structure, is small in size, light in weight and convenient to carry and can be used for detecting the concentration of nitrite in an environmental water sample in wild field, and therefore the trueness and reliability of test results are ensured and high test accuracy is ensured.
Description
Technical field
The utility model relates to water quality monitoring technical field, is specifically related to a kind of pick-up unit of laser detection nitrite anions concentration.
Background technology
Nitrite is intermediate active in nitrogen cycle, incomplete or the reducing nitrate radical of ammoxidation not exclusively can produce nitrite, nitrite is extensively present in many materials as in many materials such as water, soil, vegetables and salted vegetables, is biosome to be had to the chemical substance of serious toxic action.China bans use of nitrite in a lot of industries, and nitrite has also become a big event of water quality, environment, food, drugs of abuse.This analyzer all can have wide practical use at aspects such as environmental protection, environmental surveys, aquaculture, food industry and inspection and quarantine.
At present, content of nitrite method for measuring mainly contains UV-spectrophotometry, Catalytic-Kinetic Spectrophotometric, fluorescence spectrophotometry, chemoluminescence method, polarography, the chromatography of ions and ion-selective electrode potentiometry etc.(nitrite study on determination method progress, Yellow River Conservancy Technical Institute's journal, 2005, the 17 volumes, the 1st phase, 50-52 page) from experimental implementation and institute's use instrument, consider, UV-spectrophotometry is more similar to Catalytic-Kinetic Spectrophotometric, is all in test solution to be measured, quantitatively to add or do not add after certain developer, tests the difference of its absorbance and reference solution absorbance under a certain specific wavelength, after contrast standard curve, draw the concentration of solution Nitrite to be measured.In ultraviolet-visible optical wavelength range, the standard method of measuring nitrite is both at home and abroad diazo coupling colourimetry, under acid condition, nitrite and sulfanilic acid generate heavy ammonia salt, generate aubergine dyestuff with N-1-naphthyl-ethylenediamine-hydrochloride (or alpha-naphthylamine) coupling again, under a certain specific wavelength, measure absorbance.Catalytic-Kinetic Spectrophotometric, be nitrite catalysis potassium bromate (or potash chlorate) oxidation-reduction quality dyestuff delicately under acid medium, make it to fade, in reaction, carry out after certain hour, by method cessation reactions such as cooling, change pH, under a certain specific wavelength, measure absorbance.(nitrite study on determination method progress, Yellow River Conservancy Technical Institute's journal, 2005, the 17 volumes, the 1st phase, 50-52 page)
The classical Grignard of utilization that China had reported is measured the method for content of nitrite, and its range of linearity mainly concentrates on 0～5ng/ μ l, detects lower limit and concentrates on 0.001-0.01ng/ μ l; Although can obtain good detection lower limit with catalytic spectrophotometric content of nitrite, in mensuration process, generally all need to use water-bath, and the reaction time to control very accurately, not so there will be the phenomenon that repetition rate is lower; Ultraviolet Photometric Method detects lower limit can reach 0.0069ng/ μ l, has higher sensitivity, but institute's more complicated mathematics manipulation of the data of surveying needs maybe need to adopt dual wavelength, and even Spectrophotometry Method Using Three-wavelength is measured, and has increased the complexity of measuring and data processing.(interior spectrphotometric method for measuring nitrite progress, spectrographic laboratory, in May, 2010,900-907 page)
At present, the price that national and foreign standards method or additive method are measured solution instrument that nitrite is used from thousands of to ten tens thousand of not etc., measure the higher instrument of precision, because too heavy and be all not suitable in the wild or on-the-spot use, sample need be treated to meeting experimental determination, but the nitrite in natural water is very unstable, when containing oxygen and under microbial action, oxidable one-tenth nitrate, under anoxic or oxygen free condition, also can be reduced to ammonia, therefore after sampling, should analyze as early as possible, if measure again after sample is taken back to laboratory, the content of nitrite anions will change to some extent, cause measurement result inaccurate.Can be in the wild or the instrument of field test content of nitrite yet be easy to carry, its measuring accuracy is not very high.
Utility model content
For above problems of the prior art, it is a kind of with low cost, simple in structure and be convenient for carrying that the utility model provides, can be in the wild the high-precision measuring device of the concentration of the real time measure environmental water sample Nitrite on the spot, guarantee authenticity and the reliability of test result simultaneously.
The purpose of this utility model is to provide a kind of pick-up unit of laser detection nitrite anions concentration.
The pick-up unit of laser detection nitrite anions concentration of the present utility model comprises: light-source system, cuvette, sample cell, silicon photocell and voltage table; Wherein, in cuvette, fill sample and developer, the one-wavelength laser that developer sends with light-source system is corresponding, and developer reacts the aubergine dyestuff generating with nitrite anions in sample, linear to being incident to the absorption of one-wavelength laser and the concentration of nitrite anions of cuvette; Light-source system is launched one-wavelength laser, see through and be placed on the cuvette in sample cell, by silicon photocell, received, convert light signal to electric signal, transfer to voltage table, according to the reading of voltage table, lead to the equation of linear regression of the concentration of superpotential variable quantity-nitrite anions, obtain the concentration of sample Nitrite.
Light-source system comprises laser instrument, collimating apparatus, heating radiator and voltage stabilizer; Wherein, laser instrument sends one-wavelength laser, and voltage stabilizer connecting laser, for laser instrument provides stable voltage, guarantees the power stability of shoot laser; The surface of laser instrument connects heating radiator, and laser instrument is carried out to active heat removal; Collimating apparatus is placed on before laser instrument, and the one-wavelength laser that laser instrument is sent collimates, and becomes directional light, thereby guarantee that laser vertical is incident to cuvette, can not there is refraction or total reflection and cause the loss of laser, and be irradiated to equably the sample in cuvette, guarantee stability.
In the cuvette filling containing the sample of nitrite anions, add developer to react generation aubergine dyestuff with the nitrite anions in sample, when the laser of respective wavelength sees through sample, absorption of sample laser, thereby the sharp light intensity transmiting relatively weakens, the laser intensity that silicon photocell absorbs reduces, and this light signal is transformed into electric signal, the electromotive force of measuring silicon photocell generation by voltage table changes, thereby the variation of laser intensity is characterized; The concentration that adds the sample Nitrite of developer, linear with the laser intensity absorbing, thereby the electromotive force of the silicon photocell of measuring with voltage table changes and has good linear relationship, according to this principle preparation, detect the pick-up unit of the concentration of nitrite anions, by the reading of voltage table, can access the concentration of nitrite anions.
Laser is all high artificial light sourcess of a kind of brightness, collimation, monochromaticity, stability, and the wavelength of its medium green laser is 532nm.Through investigation, the green semiconductor laser diode of 5～100mW is stable supply in China market.Silicon photocell is that luminous energy is worn to the semiconductor device that changes electric energy into, and while being subject to illumination, silicon photocell becomes electric energy by transform light energy, causes the deflection of pointer of the voltage table of connection.With the development of China's photovoltaic industry, on market, also stablized supply high quality silicon photoelectric cell, and price is all very low.The utility model is through test discovery, and silicon photocell has good response to 532nm laser.
The utility model adopts the laser instrument of 532nm, correspondingly, adds the developer of respective wavelength, thereby absorb the laser of 532nm in the cuvette filling containing the sample of nitrite anions, and the concentration of nitrite anions is directly proportional to the sharp light intensity of absorption.The utility model obtains through the also repetition test that studies for a long period of time, and the developer being equipped with by a certain percentage makes nitrite anions present aubergine, and the absorption of this aubergine to the laser of 532nm is linear with the concentration of nitrite anions.For the certain sample solution of cumulative volume, with respect to cumulative volume ratio, the citric acid solution that volume ratio 0.1～0.12 concentration is 210.10g/L, the sulfanilic acid solution that volume ratio 0.060～0.075 concentration is 1.00g/L, after vibration, adding volume ratio is that 0.035～0.050 concentration is N-1-naphthyl-ethylenediamine-hydrochloride solution of 0.5g/L again, makes nitrite anions present aubergine.Experimental result shows, the concentration of nitrite anions is within the scope of 0～1.8ng/ μ l, and above-mentioned purplish red solution is good linear relationship to the concentration of the absorption of the laser of wavelength 532nm and nitrite anions.The utility model adopts citric acid, and citric acid is solid-state at normal temperatures, is convenient for carrying, and is conducive to take to field, and to environment without harm.
Further, silicon photocell is connected to voltage table through diode, due to the unilateral conduction of diode, make electric current to flow to voltage table from silicon photocell, and can be from voltage table reverse direction flow to silicon photocell, thereby while preventing that light intensity on silicon photocell from dying down, the reversed flow of electric current.
Further, the utility model comprises cabinet, and light-source system, cuvette, sample cell, silicon photocell and voltage table are placed in cabinet, is well suited for bringing to scene and measures.
The detection method of nitrite anions concentration of the present utility model, comprises the following steps:
1) according to the solution of the nitrite anions of concentration known, with the reading of corresponding voltage table, set up typical curve and the equation of linear regression of concentration of the variable quantity-nitrite anions of voltage, obtain parameter a and regression coefficient b;
2) open mono-colour laser and voltage table, and wait for the stable reading of voltage table, 10～30 seconds;
3) cuvette that fills the sample that does not add developer is positioned in sample cell, light-source system is launched one-wavelength laser, sees through cuvette, by silicon photocell, is received, and converts light signal to electric signal, transfers to voltage table, records the now reading U of voltage table
0;
4) developer is added in the cuvette that fills sample, after color stability, cuvette is positioned in sample cell;
5) light-source system is launched one-wavelength laser, sees through cuvette, by silicon photocell, is received, and converts light signal to electric signal, transfers to voltage table, records the now reading U(U of voltage table
0>U);
6) according to U
0the value of-U, the equation of linear regression U of the concentration of logical superpotential variable quantity-nitrite anions
0-U=a+bx, obtains the concentration x of sample Nitrite.
Wherein, in step 1), set up typical curve and the regression equation of concentration of the variable quantity-nitrite anions of voltage, comprise the following steps:
A) solution that does not contain nitrite anions is injected to cuvette, then add quantitative developer, overall solution volume is certain;
B) open mono-colour laser and voltage table, and wait for the stable reading of voltage table, 10～30 seconds;
C) cuvette is placed in sample cell, light-source system is launched one-wavelength laser, sees through cuvette, by silicon photocell, is received, and converts light signal to electric signal, transfers to voltage table, records the now reading U of voltage table
0;
D) cumulative volume is constant, and in filling the cuvette of developer, adding concentration is C
initrite anions, after color stability, cuvette is positioned in sample cell;
E) light-source system is launched one-wavelength laser, sees through cuvette, by silicon photocell, is received, and converts light signal to electric signal, transfers to voltage table, records the now reading U of voltage table
i, 1≤i≤n, n and i are natural number, and n>=2;
F) i gets n, repeating step d successively from 1)～e), obtain the variable quantity U of voltage
0-U
iconcentration C with nitrite anions
itypical curve, and set up the variable quantity U of voltage
0-U
iconcentration C with nitrite anions
iequation of linear regression U
0-U
i=a+bC
i, obtain parameter
awith regression coefficient b.
Advantage of the present utility model:
The utility model adopts the one-wavelength laser of 532nm, utilizes silicon photocell and adds the nitrite anions solution of developer of special ratios linear to the absorption of 532nm laser, and the variable quantity of the reading by voltage table obtains the concentration of nitrite anions; Due to need not prism, the beam splitting system such as grating, signal collection that need not be complicated, amplification system etc. are complicated, exquisite system exists, the anti-bumpiness of device, durability, ease for maintenance are more outstanding, and greatly degree has been saved human and material resources, financial resources; The 532nm laser and the silicon photocell that adopt low price, greatly reduced cost; Inner structure is simple, and volume is little and quality is light, is convenient for carrying, and is well suited for bringing to scene and measures; Ensure higher measuring accuracy, the concentration of local measurement environmental water sample Nitrite in the wild, has guaranteed authenticity and the reliability of test result.
Accompanying drawing explanation
Fig. 1 is the structural representation of the pick-up unit of nitrite anions concentration of the present utility model;
The canonical plotting of the concentration of variable quantity-nitrite anions that Fig. 2 is the voltage that obtains according to the detection method of nitrite anions concentration of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, by embodiment, the utility model is described further.
As shown in Figure 1, the pick-up unit of the nitrite anions concentration of the present embodiment comprises: light-source system 1, cuvette 2, sample cell 3, silicon photocell 4 and voltage table 5; Wherein, fill sample and developer in cuvette 2, developer is corresponding with the one-wavelength laser of light-source system 1; Light-source system 1 is launched one-wavelength laser, sees through and is placed on the cuvette 2 in sample cell 3, by silicon photocell 4, is received, and converts light signal to electric signal, transfers to voltage table 5.Light-source system 1 comprises laser instrument 11, collimating apparatus 12, heating radiator 13 and voltage stabilizer; Wherein voltage stabilizer connecting laser 11; The surface of laser instrument 11 connects heating radiator 13; Collimating apparatus 12 is placed on before laser instrument by sleeve, and the one-wavelength laser that laser instrument is sent collimates, and becomes directional light, thereby guarantees that laser vertical is incident to cuvette.
In the present embodiment, laser instrument 11 adopts 532nm semiconductor laser tube; Collimating apparatus 12 adopts optical coating lens; Heating radiator 13 adopts aluminium alloy radiating fin, with 4cm radiator fan, radiating fin and laser instrument is carried out to active heat removal; Adopting lithium battery is laser instrument power supply, and by voltage stabilizer by voltage stabilization at 3.02V; Silicon photocell 4 adopts and drips offset plate ICO-SPC-45MA0.5V, and crest voltage is 0.5V, and peak point current is 45mA; Voltage table 5 adopts 3 half digital display voltmeters, and range 0～1.999V connects silicon photocell 4 through schottky diode D.More than device is arranged in the cabinet of aluminum of the high 13cm of being respectively of length and width, 8cm and 5cm, and quality is 278g, and volume is little, quality is light and be convenient for carrying.
In order to realize the linear absorption response to the laser of 532nm wavelength, the utility model proposes the developer of a certain proportion of citric acid, sulfanilic acid and N-1-naphthyl-ethylenediamine-hydrochloride.The ratio of determining each composition, realizes by following steps:
1) first determine the composition of anhydrous sulfanilic acid: the first fixing components unchanged of citric acid and N-1-naphthyl-ethylenediamine-hydrochloride, by the ascending increase successively of the composition of sulfanilic acid, obtain the absorption spectra of solution to 532nm laser, with the point of absorption value maximum, be defined as the composition of sulfanilic acid;
2) then determine the composition of citric acid: the components unchanged of fix N-1-naphthyl-ethylenediamine-hydrochloride, and fixedly the composition of sulfanilic acid is composition definite in step 1), by the ascending increase successively of the composition of citric acid, obtain the absorption spectra of solution to 532nm laser, with the point of absorption value maximum, be defined as the composition of citric acid;
3) with the maximum point of absorption obtained above definite sulfanilic acid and citric acid components unchanged, by the ascending increase successively of the composition of N-1-naphthyl-ethylenediamine-hydrochloride, obtain the absorption spectra of solution to 532nm laser, with the point of absorption value maximum, be defined as the composition of N-1-naphthyl-ethylenediamine-hydrochloride, thereby obtain the composition to each material of the developer of the laser linear absorption of 532nm.The utility model draws through prolonged and repeated test, in the 10ml cuvette of fully washing, be sequentially added into 1ml solution to be measured, 1.2ml concentration is the citric acid solution of 210.10g/L, 0.7ml concentration is the sulfanilic acid solution of 1.00g/L, after vibration, N-1-naphthyl-ethylenediamine-hydrochloride the solution that adds again 0.4ml0.5g/L, is settled to 10ml.Now, it is maximum that the absorbance of device reaches, and near the absorbance it is comparatively stable.Solvent adopts secondary deionized water.The detection method of the nitrite anions concentration of the present embodiment, comprises the following steps:
1) at 21(n=20) only fully in the cuvette of washing, add successively concentration C
ibe respectively 0,0.1,0.2,0.3 ... 2.0ml10ng/ after μ l sodium nitrite solution, all add 210.10g/L citric acid solution 1.2ml, 0.7ml concentration is 1.00g/L sulfanilic acid solution, 150rpm vibration is after 5 minutes, adding 0.4ml concentration is N-1-naphthyl-ethylenediamine-hydrochloride solution of 0.5g/L, be settled to 10ml, the concentration of sodium nitrite is followed successively by 0,0.1,0.2,0.3 ... 2.0ng/ μ l, set up typical curve and the equation of linear regression of concentration of the variable quantity-nitrite anions of voltage, determine parameter a and regression coefficient b:
A) solution that does not contain sodium nitrite is injected to cuvette, then add quantitative developer, overall solution volume is settled to 10ml;
B) open mono-colour laser and the voltage table of 532nm, and wait for the stable reading of voltage table, 10～30 seconds;
C) cuvette is placed in sample cell, light-source system is launched the laser of 532nm, sees through cuvette, by silicon photocell, is received, and converts light signal to electric signal, transfers to voltage table, records the now reading U of voltage table
0;
D) in cuvette, adding concentration is C
initrite anions, after color stability, cuvette is positioned in sample cell;
E) light-source system is launched one-wavelength laser, sees through cuvette, by silicon photocell, is received, and converts light signal to electric signal, transfers to voltage table, records the now reading U of voltage table
i, 1≤i≤n, n is 20;
F) i is taken to n, repeating step d successively from 1)～e), obtain the variable quantity U of voltage
0-U
iconcentration C with nitrite anions
itypical curve, and according to typical curve, set up the variable quantity U of voltage
0-U
iconcentration C with nitrite anions
iequation of linear regression U
0-U
i=a+bC
i, obtain parameter a and regression coefficient b.
The sampling spot of the concentration of nitrite anions is from 0～2.0ng/ μ l, is to take the arithmetic progression that 0.1ng/ μ l is tolerance that the sampling spot of the concentration of totally 21 nitrite anions correspondingly obtains the reading of 20 voltage tables, the variable quantity of corresponding 20 voltages; The concentration of nitrite anions of take is horizontal ordinate, with the variable quantity U of corresponding voltage table
0-U
ifor the typical curve of ordinate as shown in Figure 2.According to typical curve, set up equation of linear regression U
0-U
i=0.1094+0.0070C
i, obtain linear coefficient a=0.1094, b=0.0070.The correlation coefficient r of this equation of linear regression is 0.9984, experimental result shows that the concentration of nitrite anions is within the scope of 0～1.8ng/ μ l, the aubergine that developer of the present utility model shows nitrite anions, absorption to the laser of wavelength 532nm, is good linear relation with the concentration of nitrite anions.
Obtain, after parameter a and regression coefficient b, sample being tested, obtain the concentration of the nitrite anions of testing sample:
2) open mono-colour laser and voltage table, and wait for the stable reading of voltage table, 10～30 seconds;
3) cuvette that fills the sample that does not add developer is positioned in sample cell, light-source system is launched the laser of 532nm, sees through cuvette, by silicon photocell, is received, and converts light signal to electric signal, transfers to voltage table, records the now reading U of voltage table
0;
4) in fully clean 10ml color comparison tube, add 1ml sample to be tested, then be sequentially added into the 210.10g/L citric acid solution 1.2ml preparing, 0.7ml concentration is 1.00g/L sulfanilic acid solution, after vibration, adding 0.4ml concentration is N-1-naphthyl-ethylenediamine-hydrochloride solution of 0.5g/L, is settled to 10ml, fully reaction, after color stability, contain into cuvette and be put in sample cell, read voltage table numerical value U;
5) according to U
0the value of-U, the equation of linear regression U of the concentration of logical superpotential variable quantity-nitrite anions
0-U=a+bx, obtains the concentration x of sample Nitrite, wherein, and a=0.1094, b=0.0070.
Finally it should be noted that, the object of publicizing and implementing mode is to help further to understand the utility model, but it will be appreciated by those skilled in the art that: within not departing from the spirit and scope of the utility model and appended claim, various substitutions and modifications are all possible.Therefore, the utility model should not be limited to the disclosed content of embodiment, and the scope that the claimed scope of the utility model defines with claims is as the criterion.
Claims (5)
1. a pick-up unit for laser detection nitrite anions concentration, is characterized in that, described pick-up unit comprises: light-source system (1), cuvette (2), sample cell (3), silicon photocell (4) and voltage table (5); Wherein, described cuvette fills sample and developer in (2), developer is corresponding with the one-wavelength laser that light-source system (1) sends, developer reacts the aubergine dyestuff generating with nitrite anions in sample, linear to being incident to the absorption of one-wavelength laser and the concentration of nitrite anions of cuvette (2); Described light-source system (1) is launched one-wavelength laser, sees through and is placed on the cuvette (2) in sample cell (3), by silicon photocell (4), is received, and converts light signal to electric signal, transfers to voltage table (5).
2. pick-up unit as claimed in claim 1, is characterized in that, described light-source system (1) comprises laser instrument (11), collimating apparatus (12), heating radiator (13) and voltage stabilizer; Wherein, described laser instrument (11) sends monochromatic sharp; Described voltage stabilizer connecting laser (11); The surface of described laser instrument connects heating radiator (13); It is front that described collimating apparatus (12) is placed on laser instrument (11).
3. pick-up unit as claimed in claim 2, is characterized in that, the laser instrument that described laser instrument (11) is 532nm.
4. pick-up unit as claimed in claim 1, is characterized in that, described silicon photocell (4) is connected to voltage table (5) through diode (D).
5. pick-up unit as claimed in claim 1, is characterized in that, further comprises cabinet, and described light-source system (1), cuvette (2), sample cell (3), silicon photocell (4) and voltage table (5) are placed in cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420121214.XU CN203772734U (en) | 2014-03-18 | 2014-03-18 | Detection device for detecting nitrite concentration by using laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420121214.XU CN203772734U (en) | 2014-03-18 | 2014-03-18 | Detection device for detecting nitrite concentration by using laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203772734U true CN203772734U (en) | 2014-08-13 |
Family
ID=51289912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420121214.XU Expired - Fee Related CN203772734U (en) | 2014-03-18 | 2014-03-18 | Detection device for detecting nitrite concentration by using laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203772734U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053436A (en) * | 2016-05-13 | 2016-10-26 | 东南大学 | Liquid phase photocatalysis test device |
-
2014
- 2014-03-18 CN CN201420121214.XU patent/CN203772734U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053436A (en) * | 2016-05-13 | 2016-10-26 | 东南大学 | Liquid phase photocatalysis test device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102798602B (en) | Integrated dual-beam water quality COD on-line detection sensor | |
| CN102012368B (en) | System and method for detecting multi-parameter of up-conversion luminescent particles | |
| CN102519916B (en) | Method and device for on-line detecting concentration of pesticide | |
| CN103776787A (en) | Double-spectrum water quality analyzer | |
| Dias et al. | A flow cell with a new design to improve the utilization of the radiation emitted by LED and employed as a radiation source for photometric detection | |
| CN104777108B (en) | The detection means and method of a kind of chlorophyll content | |
| CN102928390A (en) | On-line detection method and device for chlorophyll concentration in water body based on two detectors | |
| CN103499391A (en) | Spectrum measuring system | |
| CN105548128A (en) | Method and device for detecting chlorophyll of coastal zone water body in situ through double optical path method | |
| Yan et al. | Development of a portable setup using a miniaturized and high precision colorimeter for the estimation of phosphate in natural water | |
| CN100543455C (en) | Ozone oxidation and ultraviolet scanning spectrum integral way is measured the method for total organic carbon | |
| CA2926202A1 (en) | Multiple wavelength light source for colorimetric measurement | |
| Ng et al. | A multi‐platform optical sensor for in situ sensing of water chemistry | |
| CN203772734U (en) | Detection device for detecting nitrite concentration by using laser | |
| CN203705336U (en) | Double-spectrum water quality analyzer | |
| CN103822887B (en) | A kind of detection method of laser detection nitrite anions concentration | |
| CN201788146U (en) | Pulsed xenon lamp type soil nutrient tester | |
| CN203164119U (en) | Two-photon absorption section spectrometer | |
| CN202133468U (en) | System for measuring pulse laser energy | |
| CN201788147U (en) | Optical-fiber probe type soil nutrient tester | |
| Zhang et al. | Experimental study of the light source characteristics for the NH3 concentration detection | |
| CN203798737U (en) | Liquid pyridine qualitative detector | |
| CN103472000B (en) | Containing detection method and the device of component ratio each in the atomic gas of cushion gas | |
| CN104568799A (en) | Monochromatic light composited light scanning type luminosity absorption detection system | |
| CN103398966A (en) | Method for detecting TMC concentration in organic solution by using spectrometer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 Termination date: 20180318 |