CN104792775A - An economical and rapid type test pack for colorimetric determination of COD in a water body and a determination method - Google Patents

An economical and rapid type test pack for colorimetric determination of COD in a water body and a determination method Download PDF

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Publication number
CN104792775A
CN104792775A CN201510023038.5A CN201510023038A CN104792775A CN 104792775 A CN104792775 A CN 104792775A CN 201510023038 A CN201510023038 A CN 201510023038A CN 104792775 A CN104792775 A CN 104792775A
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China
Prior art keywords
pantone
color
concentration
cod
water
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尹魁浩
张巧
宋战锋
刘邦楠
彭盛华
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SHENZHEN ACADEMY OF ENVIRONMENTAL SCIENCE
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SHENZHEN ACADEMY OF ENVIRONMENTAL SCIENCE
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Abstract

An economical and rapid type test pack for colorimetric determination of COD in a water body and a determination method are provided. The test pack and the method are characterized in that: an integrated agent solution and a set of standard colorimetric cards are adopted to establish the rapid and convenient method, determination of a sample is achieved by following three steps, namely a step of sampling, a step of digesting and a step of color matching, and a determination range is 0-150 mg/L. Only two agents are added in the whole process of the method. Operation is simple. The agents are common and easily available. The test pack and the method are capable of rapidly obtaining a determination result, free of use of any measurement instrument and low in determination cost, provide a novel manner for water COD determination, can be widely used in society after being developed into products, and further ensure water safety. The test pack and the method fill the gap that only laboratory standard determination methods are provided for water COD determination at present while no rapid potable colorimetric determination method is provided.

Description

A kind of test pack of economic fast-type colorimetric estimation COD in water body and assay method
Technical field
The present invention relates to a kind of test pack and assay method of economic fast-type colorimetric estimation COD in water body.
Background technology
Chemical oxygen demand (COD) (COD), as a composite target of organic contamination degree in reflection water body, is one of main project of surface water, sanitary sewage and industrial waste water monitoring, is the important water quality parameter of China's Control pollution total amount discharge." drinking water sanitary standard " (GB 5740-2006), " water environment quality standard " (GB 3838-2002), " integrated wastewater discharge standard " (GB 8978-88) etc. that China formulates all make explicit provisions to the standard limited value of COD.Therefore, the aggravation along with water pollutions and the pay attention to day by day to water quality safety, the mensuration of COD index just seems particularly important.
At present, experimental determination COD still adopts standard law in a large number, although its measurement result is accurate, reappearance is high, the method existence operation is loaded down with trivial details, analysis time long and high in cost of production shortcoming.In recent years, to the research of COD assay method, comprise the improvement to standard law and other COD rapid assay methods, all achieved suitable progress, but be able to widespread use not yet.Therefore, develop the detection technique that a kind of such as pH test paper and so on is easy to carry, simple to operate, use economy, for meeting the masses and the market demand, guarantee water quality safety is significant, can compensate for the blank of the technology of colourless block-regulations test COD in water body simultaneously.
Summary of the invention
The object of the present invention is to provide test pack and the assay method of economic fast-type colorimetric estimation COD in water body, it is product and the test technology flow process of a set of water body COD test.This technological operation is simple, test agent economy is portable, except Specimen eliminating and cool time, within about 5 minutes, can realize the detection of sample, can be widely used.
Technical scheme of the present invention is: a kind of test pack of economic fast-type colorimetric estimation water-quality COD concentration, comprises preset integrated test solution, HgSO 4powder reagent bag and standard color comparison card, colorimetric bottle and instructions, instructions has certain operations code etc.
Component and the concentration thereof of described integrated test solution are:
80 ~ 85% dense H 2sO 4(v/v);
6.0~15.0 g/L Ag 2SO 4；
0.5~1.0 g/L K 2Cr 2O 7；
Described powder reagent bag specification is:
0.03 ~ 0.05 g/ wraps HgSO 4.
Described standard color comparison card adopts light face art paper to print, and it has color and corresponding COD concentration; Its color is the color of surface water, underground water and tap water by contrasting known COD concentration and described reagent experimental liquid when reacting.
Optimal way of the present invention comprises:
Described test pack comprises two parts, is integrated test solution and powder reagent bag.
Component and the concentration thereof of described integrated test solution are:
83.33% dense H 2sO 4(v/v);
8.33 g/L Ag 2SO 4；
0.81047 g/L K 2Cr 2O 7；
Be 0.04g HgSO in described powder reagent bag 4.
The color of standard color comparison card is determined by following steps:
Steps A: chromogenic reaction: add a bag HgSO in the colorimetric bottle of the integrated test solution of preset 3 mL 4pack, then the water sample adding the known COD concentration of 2 mL, fully mix, at 150 DEG C, heated at constant temperature reacts 2 hours, naturally cools 10 minutes after completion of the reaction, and then upset mixing is repeatedly, leaves standstill and is cooled to room temperature;
Step B: the color of the rear liquid of record reaction and corresponding COD concentration;
Step C: the concentration changing the water sample of known COD concentration, performs steps A and B, until all possible concentration completes, color is formed standard color comparison card with corresponding COD concentration records.
The international standard color table that described color is GP 1401 by PANTONE company model is stated;
In described step C, be the international standard colour chart comparison of GP 1401 by the solution colour in colorimetric bottle and PANTONE company model, the colour atla identical with solution colour be attached to relevant position on the art paper of light face.On concrete described standard color card, COD concentration and PANTONE company model are that the corresponding relation of the look number of the international standard colour atla of GP 1401 is as follows:
0~20.0 mg/L—PANTONE 116C；
25.0~30.0 mg/L—PANTONE 109C；
35.0 mg/L—≥ PANTONE 109C；
40.0 mg/L—≤ PANTONE 108C；
45.0 mg/L—PANTONE 108C；
50.0 mg/L—≤ PANTONE 107C；
60.0 mg/L—PANTONE 107C；
80.0 mg/L—≥ PANTONE 106C；
Between 100.0 mg/L-PANTONE 395C and PANTONE 396C;
120.0 mg/L—PANTONE 380C；
140.0 mg/L—PANTONE 2296C；
150.0 mg/L—PANTONE 2298C。
The international standard color table that described color is GP 1401 by PANTONE company model is stated;
In described step C, be the international standard colour chart comparison of GP 1401 by the solution in colorimetric bottle and PANTONE company model, remember the colour atla formula identical with solution colour, and allotment is printed onto relevant position on the art paper of light face.
On described standard color card, the corresponding relation of COD concentration and color formulas is as follows:
0 ~ 20.0 mg/L-(PANTONE Yellow 97.0 and PANTONE Warm Red 3.0);
25.0 ~ 30.0 mg/L-(PANTONE Yellow 98.5 and PANTONE Warm Red 1.5);
35.0 mg/L->=(PANTONE Yellow 98.5 and PANTONE Warm Red 1.5);
40.0 mg/L-≤(PANTONE Yellow 49.6, PANTONE Warm Red 0.8 and PANTONE Trans. Wt. 49.6);
45.0 mg/L-(PANTONE Yellow 49.6, PANTONE Warm Red 0.8 and PANTONE Trans. Wt. 49.6);
50.0 mg/L-≤(PANTONE Yellow 24.9, PANTONE Warm Red 0.4 and PANTONE Trans. Wt. 74.7);
60.0 mg/L-(PANTONE Yellow 24.9, PANTONE Warm Red 0.4 and PANTONE Trans. Wt. 74.7);
80.0 mg/L->=(PANTONE Yellow 12.5, PANTONE Warm Red 0.2 and PANTONE Trans. Wt. 87.3);
100.0 mg/L-between (PANTONE Yellow 49.2, PANTONE Green 1.6 and PANTONE Trans. Wt. 49.2) and (PANTONE Yellow 97.0 and PANTONE Green 3.0);
120.0 mg/L-(PANTONE Yellow 23.4, PANTONE Pro. Blue 1.6 and PANTONE Trans. Wt. 75.0);
140.0 mg/L-(PANTONE Yellow 012 8.7, PANTONE Green 1.54 and PANTONE Trans. Wt. 89.76);
150.0 mg/L-(PANTONE Yellow 012 14.14, PANTONE Pro. Blue 3.05 and PANTONE Trans. Wt. 82.81).
Described look number and formula all adopt U.S. Pan PANTONE(to lead to) international standard colour atla (model: GP1401) ink formulations guide title form used carries out look number and formula name:
As 0 ~ 20.0 mg/L-PANTONE 116C(PANTONE Yellow 97.0 and PANTONE Warm Red 3.0) represent be COD concentration between 0 ~ 20.0 mg/L time, the Pan PANTONE(that answers of Color pair of reaction test liquid display leads to) international standard colour atla be numbered PANTONE 116C.This color of PANTONE 116C is made up of PANTONE Yellow and PANTONE Warm Red two kinds of ink colors, accounts for 97.0% and 3.0% respectively.Other same expression, because Pan PANTONE(leads to) color standard is international, also there is no corresponding Chinese form of presentation, therefore, adopts international expression form.
Color formulas adopts U.S. PANTONE international standard colour atla (model: GP1401) ink formulations guide title form used to carry out formula name.
The present invention also provides a kind of economic fast-type colorimetric estimation water-quality COD method for measurement of concentration, comprises the following steps:
(1) chromogenic reaction: water sample to be measured and test pack reagent are fully reacted generation experimental liquid by the volume ratio of 1 ~ 3:2 ~ 5;
Described test pack reagent comprises two parts, is integrated test solution and powder reagent bag.
Component and the concentration thereof of described integrated test solution are:
80 ~ 85% dense H 2sO 4(v/v);
6.0~15.0 g/L Ag 2SO 4；
0.5~1.0 g/L K 2Cr 2O 7；
Described powder reagent bag is:
HgSO 4(specification: 0.03 ~ 0.05 g/ bag).
(2) colorimetric estimation: the color of experimental liquid and colorimetric card are compared, the concentration that Color pair identical with the color of experimental liquid on colorimetric card is answered is exactly the COD concentration of water sample to be measured.
The color of described standard color comparison card is determined by following steps:
Steps A: chromogenic reaction: add a bag HgSO in the colorimetric bottle of the integrated test solution of preset 3 mL 4pack, then the water sample adding the known COD concentration of 2 mL, fully mix, at 150 DEG C, heated at constant temperature reacts 2 hours, naturally cools 10 minutes after completion of the reaction, and then upset mixing is repeatedly, leaves standstill and is cooled to room temperature;
Step B: the color of the rear liquid of record reaction and corresponding COD concentration;
Step C: the concentration changing the water sample of known COD concentration, performs steps A and B, until all possible concentration completes, color is formed standard color comparison card with corresponding COD concentration records.
Optimal way of the present invention comprises:
In step 1, in colorimetric bottle, first add the integrated test solution of 3ml and 0.04g HgSO 4powder, the 2ml that reinjects water sample to be measured, fully mixes, and at 150 DEG C, heated at constant temperature reacts 2 h, and after completion of the reaction, take out color comparison tube and make it naturally cool 10 min, then upset mixing is repeatedly, leaves standstill and is cooled to room temperature;
Component and the concentration thereof of described integrated test solution are:
83.33% dense H 2sO 4(v/v);
8.33 g/L Ag 2SO 4；
0.81047g/L K 2Cr 2O 7。
Described colorimetric bottle is glass material, has the screw top of spiral mouth, pp material, and internal diameter and external diameter are respectively 15.0 mm and 16.0 mm, and the distance at the bottom of bottleneck to bottle is 100 mm.
Operation steps of the present invention is simple, testing process economy is portable, adopts integrated reagent greatly to improve detection efficiency and stability; Principle is based on potassium dichromate oxidation, and sensitivity, accuracy are higher, and antijamming capability is strong; Detectable concentration wide ranges, cover the water quality national standard limit values such as surface water, underground water, tap water, and colour atla CONCENTRATION DISTRIBUTION is comparatively accurate, not only can be used for judging whether water-quality COD exceeds standard, but also can provide the concentration value scope of a relative narrower; In addition, this invention reagent economy is easy to get, and can become product with colour atla combination and exploitation, sample tests expense about 20 yuan, far below the market price (200 ~ 500 yuan) of act.std detection method, its application will bring huge economic results in society, has wide market outlook.
Below contrast the drawings and specific embodiments and further instruction is more carried out to the present invention.
Accompanying drawing explanation
The flow process of COD in water body is measured in accompanying drawing 1 the present invention.
Embodiment
The present embodiment is the test pack used in a kind of economic fast-type colorimetric test COD in water body concentration.This test pack comprises two parts, is integrated test solution and powder reagent bag.Wherein, the component of integrated test solution and concentration thereof are: 83.33% dense H 2sO 4(v/v); 8.33 g/L Ag 2sO 4; 0.81047 g/L K 2cr 2o 7; Powder reagent bag is: 0.04g HgSO 4.
Standard color comparison card adopts light face art paper to print, and it has color and corresponding COD concentration; Its color is the color of surface water, underground water and tap water by contrasting known COD concentration and described reagent experimental liquid when reacting.Standard color comparison card is obtained by test in advance, and colorimetric card and reagent content and the tested water yield added have relation, but relation is corresponding, as long as test condition is constant just can use identical colorimetric card.
The color of described standard color comparison card is determined by following steps:
Steps A: chromogenic reaction: add a bag HgSO in the colorimetric bottle of the integrated test solution of preset 3 mL 4pack, then the water sample adding the known COD concentration of 2 mL, fully mix, at 150 DEG C, heated at constant temperature reacts 2 hours, naturally cools 10 minutes after completion of the reaction, and then upset mixing is repeatedly, leaves standstill and is cooled to room temperature;
Step B: the color of the rear liquid of record reaction and corresponding COD concentration;
Step C: the concentration changing the water sample of known COD concentration, performs steps A and B, until all possible concentration completes, color is formed standard color comparison card with corresponding COD concentration records.
Color on colorimetric card has two kinds of modes to state, and PANTONE company model can be adopted to be that the international standard color table of GP 1401 is stated; Also can by formulated disclosed in PANTONE company.
As adopt PANTONE company model be the international standard color table of GP 1401 state time, on colour atla, COD concentration and PANTONE company model are that the corresponding relation of the look number of the international standard colour atla of GP 1401 is as follows:
0~20.0 mg/L—PANTONE 116C；
25.0~30.0 mg/L—PANTONE 109C；
35.0 mg/L—≥ PANTONE 109C；
40.0 mg/L—≤ PANTONE 108C；
45.0 mg/L—PANTONE 108C；
50.0 mg/L—≤ PANTONE 107C；
60.0 mg/L—PANTONE 107C；
80.0 mg/L—≥ PANTONE 106C；
Between 100.0 mg/L-PANTONE 395C and PANTONE 396C;
120.0 mg/L—PANTONE 380C；
140.0 mg/L—PANTONE 2296C；
150.0 mg/L—PANTONE 2298C。
Can be by PANTONE company model so just GP 1401 international standard colour atla on the corresponding colour atla relevant position that is attached to light face art paper form colorimetric card.
On colour atla, the corresponding relation of COD concentration and color formulas is as follows:
0 ~ 20.0 mg/L-(PANTONE Yellow 97.0 and PANTONE Warm Red 3.0);
25.0 ~ 30.0 mg/L-(PANTONE Yellow 98.5 and PANTONE Warm Red 1.5);
35.0 mg/L->=(PANTONE Yellow 98.5 and PANTONE Warm Red 1.5);
40.0 mg/L-≤(PANTONE Yellow 49.6, PANTONE Warm Red 0.8 and PANTONE Trans. Wt. 49.6);
45.0 mg/L-(PANTONE Yellow 49.6, PANTONE Warm Red 0.8 and PANTONE Trans. Wt. 49.6);
50.0 mg/L-≤(PANTONE Yellow 24.9, PANTONE Warm Red 0.4 and PANTONE Trans. Wt. 74.7);
60.0 mg/L-(PANTONE Yellow 24.9, PANTONE Warm Red 0.4 and PANTONE Trans. Wt. 74.7);
80.0 mg/L->=(PANTONE Yellow 12.5, PANTONE Warm Red 0.2 and PANTONE Trans. Wt. 87.3);
100.0 mg/L-between (PANTONE Yellow 49.2, PANTONE Green 1.6 and PANTONE Trans. Wt. 49.2) and (PANTONE Yellow 97.0 and PANTONE Green 3.0);
120.0 mg/L-(PANTONE Yellow 23.4, PANTONE Pro. Blue 1.6 and PANTONE Trans. Wt. 75.0);
140.0 mg/L-(PANTONE Yellow 012 8.7, PANTONE Green 1.54 and PANTONE Trans. Wt. 89.76);
150.0 mg/L-(PANTONE Yellow 012 14.14, PANTONE Pro. Blue 3.05 and PANTONE Trans. Wt. 82.81).
So also print colour atla voluntarily by color formulas recited above.
The present invention is based on potassium dichromate oxidation, adopts by dense H 2sO 4, Ag 2sO 4, and K 2cr 2o 7the integrated test solution of preparation and HgSO 4powder reagent bag is tested as test agent bag, and whole detection technique flow process specifically comprises the following steps:
(1) preparation of standard color comparison card: adopt light face art paper to print standard color comparison card, COD concentration-standard color comparison card look number-color formulas is as follows:
0 ~ 20.0 mg/L-PANTONE 116C(color formulas: PANTONE Yellow 97.0 and PANTONE Warm Red 3.0);
25.0 ~ 30.0 mg/L-PANTONE 109C(color formulas: PANTONE Yellow 98.5 and PANTONE Warm Red 1.5);
35.0 mg/L->=PANTONE 109C(color formulas: PANTONE Yellow 98.5 and PANTONE Warm Red 1.5);
40.0 mg/L-≤PANTONE 108C(color formulas: PANTONE Yellow 49.6, PANTONE Warm Red 0.8 and PANTONE Trans. Wt. 49.6);
45.0 mg/L-PANTONE 108C(color formulas: PANTONE Yellow 49.6, PANTONE Warm Red 0.8 and PANTONE Trans. Wt. 49.6);
50.0 mg/L-≤PANTONE 107C(color formulas: PANTONE Yellow 24.9, PANTONE Warm Red 0.4 and PANTONE Trans. Wt. 74.7);
60.0 mg/L-PANTONE 107C(color formulas: PANTONE Yellow 24.9, PANTONE Warm Red 0.4 and PANTONE Trans. Wt. 74.7);
80.0 mg/L->=PANTONE 106C(color formulas: PANTONE Yellow 12.5, PANTONE Warm Red 0.2 and PANTONE Trans. Wt. 87.3);
100.0 mg/L-PANTONE395C(color formulas: PANTONE Yellow 49.2, PANTONE Green 1.6 and PANTONE Trans. Wt. 49.2) and PANTONE396C(color formulas: PANTONE Yellow 97.0 and PANTONE Green 3.0) between.
120.0 mg/L-PANTONE 380C(color formulas: PANTONE Yellow 23.4, PANTONE Pro. Blue 1.6 and PANTONE Trans. Wt. 75.0);
140.0 mg/L-PANTONE 2296C(color formulas: PANTONE Yellow 012 8.7, PANTONE Green 1.54 and PANTONE Trans. Wt. 89.76);
150.0 mg/L-PANTONE 2298C(color formulas: PANTONE Yellow 012 14.14, PANTONE Pro. Blue 3.05 and PANTONE Trans. Wt. 82.81).
Described test agent bag is prepared according to the following formulation: this test pack comprises two parts, is integrated test solution and powder reagent bag.Wherein, the component of integrated test solution and concentration thereof are: 80 ~ 85% dense H 2sO 4(v/v); 6.0 ~ 15.0 g/L Ag 2sO 4; 0.5 ~ 1.0 g/L K 2cr 2o 7; Powder reagent bag is: HgSO 4(specification: 0.03 ~ 0.05 g/ bag).Now, the color parameter of each concentration point of standard color comparison card need be calibrated by U.S. PANTONE international standard colour atla (model: GP 1401) ink formulations guide, with the aberration avoiding the purity of reagent, weighing deviation and special chaff interference existence etc. cause, subsequent standards trace routine also should use this pack.
Described look number all adopts U.S. PANTONE international standard colour atla (model: GP 1401) ink formulations guide title form used to carry out look number with color formulas and names with formula.
The look number " >=PANTONE 109C " of 35.0 mg/L concentration point refers to that the color response of this concentration point is between " PANTONE 109C " and " PANTONE 108C ", and near " PANTONE 109C ";
The look number "≤PANTONE 108C " of 40.0 mg/L concentration point refers to that the color response of concentration point is between " PANTONE 109C " and " PANTONE 108C ", and near " PANTONE 108C ";
The look number "≤PANTONE 107C " of 50.0 mg/L concentration point refers to that the color response of concentration point is between " PANTONE 108C " and " PANTONE 107C ", and near " PANTONE 107C ";
The look number " >=PANTONE 106C " of 80.0 mg/L concentration point refers to that the color response of concentration point is between " PANTONE 106C " and " PANTONE 395C ", and near " PANTONE 106C ";
The look number " between PANTONE 395C and a PANTONE 396C " of 100.0 mg/L concentration point refers to that the color response of concentration point is between " PANTONE 395C " and " PANTONE 396C ".
(2) standard test procedure:
1. chromogenic reaction: add a bag HgSO in the colorimetric bottle of the integrated test solution of preset 3 mL 4pack, then the water sample adding the known COD concentration of 2 mL, fully mix, at 150 DEG C, heated at constant temperature reacts 2 hours, naturally cools 10 minutes after completion of the reaction, and then upset mixing is repeatedly, leaves standstill and is cooled to room temperature;
2. colorimetric estimation: by the color of testing sample and standard color comparison card comparison, if color conforms to certain color stage, then the concentration that this color range is indicated is the concentration of COD in water sample; If color is between two color ranges, then estimate the concentration of the approximate value between two color ranges as water sample COD according to gradation of color;
Described colorimetric bottle is glass material, has the screw top of spiral mouth, pp material, and internal diameter and external diameter are respectively 15.0 mm and 16.0 mm, and the distance at the bottom of bottleneck to bottle is 100 mm.
When described sample and standard color comparison card comparison, should be background under natural light and with white, colorimetric bottle is vertically unsettled, from the color of bottleneck right-angle view solution.
Following examples 1 ~ 3 all adopt high purity water as test water sample (guaranteeing to pollute without COD), test with prefabricated standard color comparison card.
Embodiment 1
(1) chromogenic reaction: the color comparison tube getting an integrated test solution of preset 3 mL, toward wherein adding a bag HgSO 4powder reagent, fully dissolves.The COD mark-on sample getting 20.0 mg/L that 2 mL prepare with high purity water adds in colorimetric bottle, and cover bottle cap and tighten, shaken several times makes solution fully mix energetically, is placed in counteract appearance heated at constant temperature at 150 DEG C and reacts 2 hours.After question response, take out color comparison tube and make it naturally cool 10 min, then upset mixing repeatedly, leaves standstill and be cooled to room temperature.
(2) colorimetric estimation: the color of testing sample and standard color comparison card are compared.
In this example, the color of sample is shown as PANTONE 116C, and with standard color comparison card 20.0 mg/L solid colour, result has reappearance.
Embodiment 2
(1) chromogenic reaction: the color comparison tube getting an integrated test solution of preset 3 mL, toward wherein adding a bag HgSO 4powder reagent, fully dissolves.The COD mark-on sample getting 80.0 mg/L that 2 mL prepare with high purity water adds in colorimetric bottle, and cover bottle cap and tighten, shaken several times makes solution fully mix energetically, is placed in counteract appearance heated at constant temperature at 150 DEG C and reacts 2 hours.After question response, take out color comparison tube and make it naturally cool 10 min, then upset mixing repeatedly, leaves standstill and be cooled to room temperature.
(2) colorimetric estimation: the color of testing sample and standard color comparison card are compared.
In this example, the color display of sample is between " PANTONE 106C " and " PANTONE 395C ", and near " PANTONE 106C ", i.e. " >=PANTONE 106C ", with standard color comparison card 80.0 mg/L solid colour, result has reappearance.；
Embodiment 3
(1) chromogenic reaction: the color comparison tube getting an integrated test solution of preset 3 mL, toward wherein adding a bag HgSO 4powder reagent, fully dissolves.The COD mark-on sample getting 150.0 mg/L that 2 mL prepare with high purity water adds in colorimetric bottle, and cover bottle cap and tighten, shaken several times makes solution fully mix energetically, is placed in counteract appearance heated at constant temperature at 150 DEG C and reacts 2 hours.After question response, take out color comparison tube and make it naturally cool 10 min, then upset mixing repeatedly, leaves standstill and be cooled to room temperature.
(2) colorimetric estimation: the color of testing sample and standard color comparison card are compared.
In this example, the color of sample is shown as PANTONE 2298C, and with standard color comparison card 150.0 mg/L solid colour, result has reappearance.

Claims (10)

1. a test pack for economic fast-type colorimetric estimation COD in water body concentration, is characterized in that: comprise preset integrated test solution, HgSO 4powder reagent bag and standard color comparison card;
Described integrated test solution comprises the liquid mixed by following component and concentration thereof:
80 ~ 85% dense H 2sO 4(v/v);
6.0~15.0 g/L Ag 2SO 4；
0.5~1.0 g/L K 2Cr 2O 7；
Described powder reagent bag is:
Specification is that 0.03 ~ 0.05 g/ wraps HgSO 4;
Described standard color comparison card adopts light face art paper to print, and it has color and corresponding COD concentration; Its color is the color of surface water, underground water and tap water by contrasting known COD concentration and described reagent experimental liquid when reacting.
2. the test pack of economic fast-type colorimetric estimation water-quality COD concentration according to claim 1, is characterized in that:
Described integrated test solution comprises the mixing material of 3ml by following component and concentration:
83.33% dense H 2sO 4(v/v);
8.33 g/L Ag 2SO 4；
0.81047g/L K 2Cr 2O 7；
0.04 g HgSO is comprised in described powder reagent bag 4.
3. the test pack of economic fast-type colorimetric estimation water-quality COD concentration according to claim 2, is characterized in that the color of described standard color comparison card is determined by following steps:
Steps A: chromogenic reaction: add a bag HgSO in the colorimetric bottle of the integrated test solution of preset 3 mL 4pack, then the water sample adding the known COD concentration of 2 mL, fully mix, at 150 DEG C, heated at constant temperature reacts 2 hours, naturally cools 10 minutes after completion of the reaction, and then upset mixing is repeatedly, leaves standstill and is cooled to room temperature;
Step B: the color of the rear liquid of record reaction and corresponding COD concentration;
Step C: the concentration changing the water sample of known COD concentration, performs steps A and B, until all possible concentration completes, color is formed standard color comparison card with corresponding COD concentration records.
4. the test pack of economic fast-type colorimetric estimation water-quality COD concentration according to claim 3, is characterized in that: the international standard color table that described color is GP 1401 by PANTONE company model is stated;
In described step C, be the international standard colour chart comparison of GP 1401 by the solution colour in colorimetric bottle and PANTONE company model, the colour atla identical with solution colour be attached to relevant position on the art paper of light face.
5. the test pack of economic fast-type colorimetric estimation water-quality COD concentration according to claim 4, is characterized in that:
On described standard color comparison card, to be the international standard look corresponding relation of GP 1401 be for COD concentration and PANTONE company model:
0~20.0 mg/L—PANTONE 116C；
25.0~30.0 mg/L—PANTONE 109C；
35.0 mg/L—≥ PANTONE 109C；
40.0 mg/L—≤ PANTONE 108C；
45.0 mg/L—PANTONE 108C；
50.0 mg/L—≤ PANTONE 107C；
60.0 mg/L—PANTONE 107C；
80.0 mg/L—≥ PANTONE 106C；
Between 100.0 mg/L-PANTONE 395C and PANTONE 396C;
120.0 mg/L—PANTONE 380C；
140.0 mg/L—PANTONE 2296C；
150.0 mg/L—PANTONE 2298C。
6. the test pack of economic fast-type colorimetric estimation water-quality COD concentration according to claim 3, is characterized in that: the international standard color table that described color is GP 1401 by PANTONE company model is stated;
In described step C, be the international standard colour chart comparison of GP 1401 by the solution in colorimetric bottle and PANTONE company model, remember the colour atla formula identical with solution colour, and allotment is printed onto relevant position on the art paper of light face.
7. the test pack of economic fast-type colorimetric estimation water-quality COD concentration according to claim 6, is characterized in that:
On described standard color card, the corresponding relation of COD concentration and color formulas is as follows:
0 ~ 20.0 mg/L-(PANTONE Yellow 97.0 and PANTONE Warm Red 3.0);
25.0 ~ 30.0 mg/L-(PANTONE Yellow 98.5 and PANTONE Warm Red 1.5);
35.0 mg/L->=(PANTONE Yellow 98.5 and PANTONE Warm Red 1.5);
40.0 mg/L-≤(PANTONE Yellow 49.6, PANTONE Warm Red 0.8 and PANTONE Trans. Wt. 49.6);
45.0 mg/L-(PANTONE Yellow 49.6, PANTONE Warm Red 0.8 and PANTONE Trans. Wt. 49.6);
50.0 mg/L-≤(PANTONE Yellow 24.9, PANTONE Warm Red 0.4 and PANTONE Trans. Wt. 74.7);
60.0 mg/L-(PANTONE Yellow 24.9, PANTONE Warm Red 0.4 and PANTONE Trans. Wt. 74.7);
80.0 mg/L->=(PANTONE Yellow 12.5, PANTONE Warm Red 0.2 and PANTONE Trans. Wt. 87.3);
100.0 mg/L-between (PANTONE Yellow 49.2, PANTONE Green 1.6 and PANTONE Trans. Wt. 49.2) and (PANTONE Yellow 97.0 and PANTONE Green 3.0);
120.0 mg/L-(PANTONE Yellow 23.4, PANTONE Pro. Blue 1.6 and PANTONE Trans. Wt. 75.0);
140.0 mg/L-(PANTONE Yellow 012 8.7, PANTONE Green 1.54 and PANTONE Trans. Wt. 89.76);
150.0 mg/L-(PANTONE Yellow 012 14.14, PANTONE Pro. Blue 3.05 and PANTONE Trans. Wt. 82.81).
8. an economic fast-type colorimetric estimation water-quality COD method for measurement of concentration, is characterized in that the method adopts the test agent product later with water sample chemical reaction to be measured to compare with a set of standard color comparison card the content obtaining COD in water sample to be measured;
Comprise the following steps:
Step 1, chromogenic reaction: water sample to be measured and test agent are fully reacted generation experimental liquid by the volume ratio of 1 ~ 3:2 ~ 5;
Described test pack reagent comprises two parts, is integrated test solution and powder reagent bag;
Component and the concentration thereof of described integrated test solution are:
80 ~ 85% dense H 2sO 4(v/v);
6.0~15.0 g/L Ag 2SO 4；
0.5~1.0 g/L K 2Cr 2O 7；
Described powder reagent bag is:
The HgSO of 0.03 ~ 0.05 g/ bag 4;
Step 2, colorimetric estimation: the color of experimental liquid and colorimetric card are compared, the concentration that Color pair identical with the color of experimental liquid on colorimetric card is answered is exactly the COD concentration of water sample to be measured;
The color of described standard color comparison card is determined by following steps:
Steps A: chromogenic reaction: add a bag HgSO in the colorimetric bottle of the integrated test solution of preset 3 mL 4pack, then the water sample adding the known COD concentration of 2 mL, fully mix, at 150 DEG C, heated at constant temperature reacts 2 hours, naturally cools 10 minutes after completion of the reaction, and then upset mixing is repeatedly, leaves standstill and is cooled to room temperature;
Step B: the color of the rear liquid of record reaction and corresponding COD concentration;
Step C: the concentration changing the water sample of known COD concentration, performs steps A and B, until all possible concentration completes, color is formed standard color comparison card with corresponding COD concentration records.
9. economic fast-type colorimetric estimation water-quality COD method for measurement of concentration according to claim 8, is characterized in that:
In described step 1, in colorimetric bottle, first add the integrated test solution of 3ml and 0.04g HgSO 4powder, the 2ml that reinjects water sample to be measured, fully mixes, and at 150 DEG C, heated at constant temperature reacts 2 h, and after completion of the reaction, take out color comparison tube and make it naturally cool 10 min, then upset mixing is repeatedly, leaves standstill and is cooled to room temperature;
Component and the concentration thereof of described integrated test solution are:
83.33% dense H 2sO 4(v/v);
8.33 g/L Ag 2SO 4；
0.81047g/L K 2Cr2O 7。
10. economic fast-type colorimetric estimation water-quality COD method for measurement of concentration according to claim 8, it is characterized in that: described colorimetric bottle is glass material, there is the screw top of spiral mouth, pp material, internal diameter and external diameter are respectively 15.0 mm and 16.0 mm, and the distance at the bottom of bottleneck to bottle is 100 mm.
CN201510023038.5A 2015-01-16 2015-01-16 An economical and rapid type test pack for colorimetric determination of COD in a water body and a determination method Pending CN104792775A (en)

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CN106596877A (en) * 2015-10-14 2017-04-26 孙诗文 Method and reagent composition for measuring chemical oxygen consumption in water
CN107091836A (en) * 2017-04-05 2017-08-25 绍兴柯桥江滨水处理有限公司 The method and its device of a kind of quick measure water sample COD
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CN110542680B (en) * 2019-07-16 2021-07-20 华南理工大学 Portable wastewater COD detection device based on 3D printing paper base and manufacturing and measuring method
CN112485099A (en) * 2020-11-23 2021-03-12 陕西彩虹新材料有限公司 Preparation method of COD mixed digesting agent
CN116067959A (en) * 2023-02-15 2023-05-05 山东益源环保科技有限公司 Full-automatic determination method for seawater COD
CN116067959B (en) * 2023-02-15 2024-08-30 山东益源环保科技有限公司 Full-automatic determination method for seawater COD

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Application publication date: 20150722