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Dichromate method for determining chemical oxygen demand in water

A technology of chemical oxygen demand and dichromate method, which is applied in the direction of chemical analysis by titration method, can solve the problems of organic matter corruption and decomposition, deterioration of water quality and odor, etc., and achieves low pollution, accurate detection results, and simple and easy measurement process The effect of the operation

Pending Publication Date: 2020-05-08
广东方舟检测技术有限公司
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Problems solved by technology

Once the water body is under anoxic conditions, these organic matter will decompose and decompose, which will deteriorate the water quality, produce stench, and cause serious environmental problems

Method used

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  • Dichromate method for determining chemical oxygen demand in water
  • Dichromate method for determining chemical oxygen demand in water
  • Dichromate method for determining chemical oxygen demand in water

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Embodiment 1

[0021] A dichromate method for measuring chemical oxygen demand in water, comprising the following steps:

[0022] S1. preparation concentration is 0.025mol / L potassium dichromate standard solution, concentration is the ferrous ammonium sulfate standard solution of 0.0055mol / L; 50g mercuric sulfate is dissolved in 500ml sulfuric acid, makes mercuric sulfate solution; 0.5ml number For the standard quality control reagent of BW 0534COD, dilute to 25ml with ultrapure water to prepare the COD quality control standard solution; dissolve 0.7g of ferrous sulfate heptahydrate and 1.5g of 1,10-phenanthroline in 50ml of ultrapure water, Prepare the test ferrous indicator;

[0023] S2. Add 5ml of potassium dichromate standard solution and 15ml of sulfuric acid into 45ml of ultrapure water to prepare a calibration sample; add 5ml of potassium dichromate standard solution and 5ml of mercury sulfate solution into 10ml of ultrapure water, and add 3-5 capsules Knock-proof glass beads were us...

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Abstract

The invention belongs to the field of water detection. The invention relates to a dichromate method for determining chemical oxygen demand in water. The dichromate method comprises the following steps: preparing a potassium dichromate standard solution, an ammonium ferrous sulfate standard solution, a mercury sulfate solution, a COD quality control standard solution and a ferrous sulfate indicator; preparing a calibration sample, a blank sample, a quality control sample and a to-be-detected sample; digesting the blank sample, the quality control sample and the to-be-detected sample, and addinga silver sulfate-sulfuric acid solution and ultrapure water; adding a ferrous sulfate indicator into the to-be-detected sample, the blank sample, the quality control sample and the calibration samplewhich are cooled to room temperature, and titrating by adopting an ammonium ferrous sulfate standard solution; recording the volume of the ammonium ferrous sulfate standard solution dropwise added into each sample; and calculating the actual concentration of the ammonium ferrous sulfate standard solution and the mass concentration of the chemical oxygen demand in the water according to a formula.The detection method is simple to operate, accurate in detection result and small in pollution.

Description

technical field [0001] The invention belongs to the field of water body detection and relates to a dichromate method for measuring chemical oxygen demand in water. Background technique [0002] The wastewater produced by human activities contains a large amount of organic matter, which can be decomposed into carbon dioxide and water by microorganisms, and the dissolved oxygen in the water needs to be consumed during the decomposition process. Once the water body is hypoxic, these organic matter will decompose, which will deteriorate the water quality, produce foul odor, and cause serious environmental problems. Due to the wide variety of organic substances and complex composition, it is difficult to distinguish one by one and measure them one by one. Therefore, in actual detection, Chemical Oxygen Demand (COD) is often used to represent organic substances that can be oxidized by chemical methods in water. The content is used as a detection index for the content of organic m...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 康喜亮封科军李浩冷翊于梦李彩均赵立开
Owner 广东方舟检测技术有限公司
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