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

A colorimetric measurement and fast technology, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems of long analysis time, cumbersome operation, and high cost.

Inactive Publication Date: 2015-07-22
SHENZHEN ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, a large number of standard methods are still used to measure COD in laboratories. Although the measurement results are accurate and reproducible, this method has disadvantages such as cumbersome operation, long analysis time and high cost.
In recent years, considerable progress has been made in the research on COD determination methods, including the improvement of the standard method and other rapid COD determination methods, but they have not been widely used.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0116] (1) Preparation of standard color comparison card: use glossy coated paper to print standard color comparison card, COD concentration - standard color card color number - color formula is as follows:

[0117] 0~20.0 mg / L—PANTONE 116C (color formula: PANTONE Yellow 97.0 and PANTONE Warm Red 3.0);

[0118] 25.0~30.0 mg / L—PANTONE 109C (color formula: PANTONE Yellow 98.5 and PANTONE Warm Red 1.5);

[0119] 35.0 mg / L—≥ PANTONE 109C (color formula: PANTONE Yellow 98.5 and PANTONE Warm Red 1.5);

[0120] 40.0 mg / L—≤ PANTONE 108C (color formula: PANTONE Yellow 49.6, PANTONE Warm Red 0.8 and PANTONE Trans. Wt. 49.6);

[0121] 45.0 mg / L—PANTONE 108C (color formula: PANTONE Yellow 49.6, PANTONE Warm Red 0.8 and PANTONE Trans. Wt. 49.6);

[0122] 50.0 mg / L—≤ PANTONE 107C (color formula: PANTONE Yellow 24.9, PANTONE Warm Red 0.4 and PANTONE Trans. Wt. 74.7);

[0123] 60.0 mg / L—PANTONE 107C (color formula: PANTONE Yellow 24.9, PANTONE Warm Red 0.4 and PANTONE Trans. Wt. 74.7);

...

Embodiment 1

[0143] (1) Color reaction: Take a colorimetric tube pre-prepared with 3 mL integrated test solution, add a pack of HgSO 4 Powder reagent, fully dissolved. Take 2 mL of 20.0 mg / L COD spiked sample prepared with high-purity water and add it to the colorimetric bottle, cover and tighten the bottle cap, shake vigorously several times to mix the solution fully, place it in a digestion apparatus and heat it at a constant temperature of 150 °C React for 2 hours. After the reaction was completed, the colorimetric tube was taken out and allowed to cool naturally for 10 min, then inverted and mixed several times, and allowed to stand to cool to room temperature.

[0144] (2) Colorimetric determination: compare the color of the sample to be tested with the standard color card.

[0145]The color of the sample in this example is displayed as PANTONE 116C, which is consistent with the color of the standard color card 20.0 mg / L, and the results are reproducible.

Embodiment 2

[0147] (1) Color reaction: Take a colorimetric tube pre-prepared with 3 mL integrated test solution, add a pack of HgSO 4 Powder reagent, fully dissolved. Take 2 mL of 80.0 mg / L COD spiked sample prepared with high-purity water and add it to the colorimetric bottle, cover the bottle cap and tighten it, shake vigorously several times to mix the solution fully, place it in a digestion apparatus and heat it at a constant temperature of 150 °C React for 2 hours. After the reaction was completed, the colorimetric tube was taken out and allowed to cool naturally for 10 min, then inverted and mixed several times, and allowed to stand to cool to room temperature.

[0148] (2) Colorimetric determination: compare the color of the sample to be tested with the standard color card.

[0149] The color display of the sample in this example is between "PANTONE 106C" and "PANTONE 395C", and close to "PANTONE 106C", that is, "≥PANTONE 106C", which is consistent with the color of the standard ...

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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

technical field [0001] The invention relates to an economical and rapid colorimetric test kit for measuring COD in water bodies and a measuring method. Background technique [0002] Chemical oxygen demand (COD), as a comprehensive indicator reflecting the degree of organic pollution in water bodies, is one of the main items for monitoring surface water, domestic sewage and industrial wastewater, and is an important water quality parameter for controlling the total discharge of pollution in my country. The "Drinking Water Hygienic Standard" (GB 5740-2006), "Surface Water Environmental Quality Standard" (GB 3838-2002) and "Sewage Comprehensive Discharge Standard" (GB 8978-88) all set the standard limits for COD. The value is clearly defined. Therefore, with the aggravation of water pollution and the increasing emphasis on water quality safety, the determination of COD index is particularly important. [0003] At present, a large number of standard methods are still used to m...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 尹魁浩张巧宋战锋刘邦楠彭盛华
Owner SHENZHEN ACAD OF ENVIRONMENTAL SCI
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