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COD determination reagent and application thereof

A technology for medicaments and mixing medicaments, which is used in measuring devices, measurement of color/spectral properties, and analysis by chemical reactions of materials, etc., can solve the problems of complex preparation methods, low accuracy and low oxidation rate, and shorten the experiment Time, reduce the measurement error, the effect of accurate test results

Inactive Publication Date: 2020-02-21
CHENGDU KEHENG ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Potassium permanganate method has a low oxidation rate and the accuracy of the obtained value is low, but it is easy to operate and is suitable for the determination of specified organic matter in water; potassium dichromate method has a high oxidation rate and high accuracy and is suitable for the determination of total organic matter in water content, but requires more agents, the preparation method is complicated, and the operation is not easy

Method used

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  • COD determination reagent and application thereof
  • COD determination reagent and application thereof
  • COD determination reagent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation of embodiment 1.COD assay medicament

[0032] The COD measuring agent of the present invention consists of A reagent and B reagent.

[0033] A reagent

[0034] Five kinds of A reagents were prepared for comparative experiments. The formulas of A reagents ①-⑤ are as follows:

[0035] Reagent A ①: Mercury sulfate 60g, high-quality potassium dichromate 32g, aluminum potassium sulfate 5g, ammonium molybdate 3g.

[0036] A reagent ②: Mercury sulfate 55g, high-quality potassium dichromate 30g, aluminum potassium sulfate 4g, ammonium molybdate 2g.

[0037] A reagent ③: Mercury sulfate 65g, high-quality potassium dichromate 35g, aluminum potassium sulfate 7g, ammonium molybdate 5g.

[0038] Reagent A ④: 50g of mercury sulfate, 40g of high-quality potassium dichromate, 10g of potassium aluminum sulfate, and 8g of ammonium molybdate.

[0039] Reagent A ⑤: Mercury sulfate 60g, high-quality potassium dichromate 32g.

[0040] Prepare the above-mentioned A reag...

Embodiment 2

[0049] Embodiment 2. The accuracy comparison of different COD determination medicaments

[0050]The water sample to be tested comes from a local enterprise in Xinjiang, and the COD measured by the national standard method (GB11914-89) is about 1256mg / L. Use the medicaments ①-⑤ prepared in Example 1 to measure the COD of each sample, use each medicament to do 3 repeated measurements of the water samples to be tested, take the average value, and compare with the measurement results of the national standard method (GB11914-89). Assay Accuracy of Different Synthetic Agents.

[0051] Drawing of the standard curve: turn on the COD rapid analyzer, and preheat to 165°C. According to the range of COD determination, potassium hydrogen phthalate was used to prepare standard solutions with gradient concentrations. Use a pipette to accurately measure 3ml of standard solution, and add it to a clean digestion colorimetric tube; accurately measure 7ml of the prepared drug ①, add it to the d...

Embodiment 3

[0056] Example 3. Evaluation of the accuracy of the COD determination agent in the oxidation range of 5 to 3000 mg / L

[0057] Water sample to be tested: It comes from a local sewage plant in Xinjiang. After testing by the water plant, the COD in the water sample is about 2895mg / L, which exceeds the oxidant oxidation limit (2000mg / L) in the national standard detection method (GB11914-89). When using the national standard method to measure the sample in the superoxidation range, the sample needs to be diluted until the oxidation range is within the oxidation range of the national standard method.

[0058] Sample preparation: Dilute the water sample to be tested with distilled water to obtain 10 samples with different concentrations. According to the national standard method (GB11914-89), the COD of each sample is 2890mg / L, 1881mg / L, 1256mg / L, 635mg / L, 324mg / L, 162mg / L, 80mg / L, 46mg / L, 23mg / L L, 5mg / L. COD measurement: Use the medicaments ①-③ prepared in Example 1 respectively,...

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Abstract

The invention relates to the field of water quality monitoring, in particular to a COD determination reagent and application thereof. The COD determination reagent comprises a reagent A and a reagentB, wherein the reagent A takes concentrated sulfuric acid as a solvent and is prepared from 110 g / L to 130 g / L of mercury sulfate, 60 g / L to 70 g / L of potassium dichromate, 8 g / L to 14 g / L of aluminumpotassium sulfate and 4 g / L to 10 g / L of ammonium molybdate; and the reagent B takes concentrated sulfuric acid as a solvent and contains 180-220g / L of silver sulfate. The COD determination reagent has the advantages of stability, high efficiency, convenience, high accuracy of determination data and wide determination range.

Description

technical field [0001] The invention relates to the field of water quality monitoring, in particular to a COD measuring agent and application thereof. Background technique [0002] The advent of the industrial age has brought great changes to people's life and production, but with the continuous progress and development of industrial technology, the problem of environmental pollution has followed and is becoming more and more serious. A large number of uncontrolled mining of minerals around the world has led to surface subsidence; overgrazing has led to a rapid decrease in vegetation coverage and severe land desertification; a large number of various chemical plants have brought economic benefits and seriously polluted the surrounding land and the atmosphere. Wait. The most serious thing is that the development of various industries and agriculture will eventually lead to the pollution of water bodies. Therefore, it is particularly important to monitor various indicators in...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/78
CPCG01N21/31G01N21/78G01N2021/775
Inventor 张克江王颖马江平
Owner CHENGDU KEHENG ENVIRONMENTAL PROTECTION TECH
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