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Economic and convenient water quality COD (Chemical Oxygen Demand) detection kit

A technology for detecting kits and water quality, which is applied in the measurement of color/spectral characteristics, etc., can solve the problems of cumbersome operation process, high detection cost, and long time consumption, and achieve the effect of good repeatability, high precision, and simple operation

Inactive Publication Date: 2019-02-22
盛世惠泽科技(天津)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The national standard potassium dichromate reflux titration method is accurate in measurement, but the consumption of samples and chemicals is large, and the operation process is cumbersome and time-consuming. The national standard rapid digestion spectrophotometric method has a low oxidation rate. Inaccurate
Some COD detection instruments on the market are accurate, reliable and easy to use, and usually come with matching detection reagents, resulting in high detection costs

Method used

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  • Economic and convenient water quality COD (Chemical Oxygen Demand) detection kit
  • Economic and convenient water quality COD (Chemical Oxygen Demand) detection kit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] COD detection reagents include chromium reagent in parts by weight: 6 parts of potassium dichromate, 10 parts of concentrated sulfuric acid, 6 parts of mercury sulfate, 78 parts of distilled water, silver reagent in parts by weight: 45 parts of silver sulfate, 55 parts of concentrated sulfuric acid .

[0022] Configuration method:

[0023] Chromium reagent configuration method: Accurately weigh 6 parts of high-grade pure potassium dichromate (dried at 120°C for 2 hours) and dissolve in about 78 parts of distilled water, stir to dissolve, slowly add 10 parts of concentrated sulfuric acid, stir to mix and cool. Then add 6 parts of mercuric sulfate, stir to dissolve, dilute to volume in a volumetric flask, and store in a brown volumetric flask.

[0024] Silver reagent preparation method: dissolve 45 parts of silver sulfate in 55 parts of concentrated sulfuric acid, let it stand for 1-2 days, stir to dissolve it, and store it away from light.

[0025] Kit assembly: digest...

Embodiment 2

[0032] COD detection reagents include chromium reagent in parts by weight: 2 parts of potassium dichromate, 5 parts of concentrated sulfuric acid, 5 parts of mercury sulfate, 88 parts of distilled water, silver reagent in parts by weight: 40 parts of silver sulfate, 60 parts of concentrated sulfuric acid .

[0033] Configuration method:

[0034] Chromium reagent configuration method: Accurately weigh 2 parts of high-grade pure potassium dichromate (dried at 120°C for 2 hours) and dissolve in about 88 parts of distilled water, stir to dissolve, slowly add 5 parts of concentrated sulfuric acid, stir to mix and cool, Then add 5 parts of mercuric sulfate, stir to dissolve, dilute to volume in a volumetric flask, and store in a brown volumetric flask.

[0035] Silver reagent preparation method: dissolve 40 parts of silver sulfate in 60 parts of concentrated sulfuric acid, let stand for 1-2 days, stir to dissolve, and store in the dark.

[0036] Kit assembly: digestion colorimetri...

Embodiment 3

[0043] COD detection reagents include chromium reagent in parts by weight: 4 parts of potassium dichromate, 16 parts of concentrated sulfuric acid, 4 parts of mercury sulfate, 76 parts of distilled water, silver reagent in parts by weight: 50 parts of silver sulfate, 50 parts of concentrated sulfuric acid .

[0044] Configuration method:

[0045] Chromium reagent configuration method: Accurately weigh 4 parts of high-grade pure potassium dichromate (dried at 120°C for 2 hours) and dissolve in about 76 parts of distilled water, stir to dissolve, slowly add 16 parts of concentrated sulfuric acid, stir to mix and cool, Then add 4 parts of mercuric sulfate, stir to dissolve, dilute to volume in a volumetric flask, and store in a brown volumetric flask.

[0046] Silver reagent preparation method: dissolve 50 parts of silver sulfate in 50 parts of concentrated sulfuric acid, let it stand for 1-2 days, stir to dissolve it, and store it away from light.

[0047] Kit assembly: digest...

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Abstract

The invention discloses an economic and convenient water quality COD (Chemical Oxygen Demand) detection kit which comprises a COD detection reagent and a digestive colorimetric tube, wherein the COD detection reagent comprises a chromium reagent and a silver reagent; the chromium reagent comprises the following components in parts by weight: 1-10 parts of potassium dichromate, 5-30 parts of concentrated sulfuric acid, 1-10 parts of mercury sulfate and 50-90 parts of distilled water; and the silver reagent comprises the following components in parts by weight: 30-70 parts of silver sulfate and30-70 parts of concentrated sulfuric acid. The invention aims to provide the economic and convenient water quality COD detection kit. The kit can be automatically prepared, and is applicable to different types of spectrophotometers (comprising COD detection instruments on the market), extremely low in cost and simple in operation, and the economic and convenient aims are achieved.

Description

technical field [0001] The invention relates to the field of water quality monitoring, in particular to an economical and convenient water quality COD detection kit. Background technique [0002] Chemical oxygen demand (COD) is a chemical method to measure the amount of reducing substances that need to be oxidized in a water sample, expressed in mg / L of oxygen. It uses chemical oxidants to oxidize the reducing substances in the water sample, and then calculates the oxygen consumption from the amount of remaining oxidants. In the study of river pollution and industrial wastewater properties and the operation and management of wastewater treatment plants, it is an important and quickly determined organic pollution parameter. High concentrations of COD will seriously endanger the water environment and human health, so COD is a very important water quality indicator for the country to control water bodies. [0003] At present, the methods for detecting COD mainly include dichr...

Claims

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Application Information

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IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 刘嘉骥马芮刘永赵伟路文静
Owner 盛世惠泽科技(天津)有限公司
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