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Method for measuring free chlorine and total chlorine in water

A determination method and technology for free chlorine, applied in the measurement of color/spectral characteristics, etc., can solve the problems of low precision of free chlorine and total chlorine in water, poor linear correlation and sensitivity, inconvenient storage of reagents, etc. Reduced size, reduced sample size, and simplified measurement procedures

Inactive Publication Date: 2016-05-25
SHANGHAI YIDIAN SCI INSTR +1
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  • Abstract
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Problems solved by technology

[0006] The object of the present invention is exactly the technical defect that the existing spectrophotometric method for measuring free chlorine and total chlorine in water is low in precision, and the purpose of the present invention is exactly to measure free chlorine in water and total chlorine for existing spectrophotometric method and consume water sample volume Large, strict sampling requirements, narrow measurement range, poor linear correlation and sensitivity, inconvenient storage of reagents, and short storage period and other technical defects, a method for the determination of free chlorine and total chlorine in water is provided. The existing measurement method is improved to prepare two powder reagents - potassium iodide reagent and DPD chromogenic reagent, which are used to measure the content of free chlorine and total chlorine in water

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment

[0024] Improvement of free chlorine and total chlorine determination method in tap water, which includes the following steps:

[0025] (1) Preparation of reagents

[0026] All reagents used were of analytical grade.

[0027] a), preparation of potassium iodide reagent

[0028] Weigh 0.1g of potassium iodide, pack it in a moisture-proof bag, and store it in a clean, cool, dry, and ventilated place, avoiding direct sunlight and high temperature.

[0029] b), the preparation of DPD chromogen reagent

[0030] Accurately weigh 3.6g of anhydrous disodium hydrogen phosphate (Na 2 HPO 4 ), 6.9g potassium dihydrogen phosphate (KH 2 PO 4 ), 0.15g disodium EDTA (disodium ethylenediaminetetraacetic acid) solid, and 0.6g anhydrous DPD sulfate (N,N-diethyl-1,4-phenylenediamine sulfate), add the above reagents slightly Grind and mix well.

[0031] Weigh 0.1 g of the above mixed reagent, pack it in a moisture-proof bag, and store it in a clean, cool, dry, and ventilated place, avoidin...

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PUM

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Abstract

Provided is a method for measuring free chlorine and total chlorine in water. Measuring steps are simple, the volume of a water sample is reduced to 1 / 10 of the original volume, and the sample taking amount is reduced; the sampling taking volume does not need to be precise and quantitative, and errors caused when sampling is not accurate are eliminated; the measuring range is widened, and linear dependence and sensitivity are improved. A reagent is convenient to store and long in storage time.

Description

technical field [0001] The invention belongs to the technical field of determination of elements in water, and specifically relates to a method for determining free chlorine and total chlorine in water, which can improve the level of free chlorine in water measured by N,N-diethyl-1,4-phenylenediamine (DPD) spectrophotometry. Accuracy of chlorine and total chlorine content. Background technique [0002] Residual chlorine is also known as free residual chlorine or active free chlorine or potential free chlorine. It exists in water bodies in the form of hypochlorous acid, hypochlorite ions and elemental chlorine. A general term for combined chlorine such as chloramines and organic chloramines. After chlorine is added to water in the form of elemental substance or chlorate, it will be hydrolyzed to generate free chlorine, including water-containing molecular chlorine, hypochlorous acid and hypochlorite ions. The relative proportion depends on the pH and temperature. In general ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 马丽
Owner SHANGHAI YIDIAN SCI INSTR
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