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Detection agent for detecting residual chlorine/total chlorine in water, preparation method and detection method thereof

A technology for detecting water and detection reagents, which is applied in the field of chemical analysis and can solve problems such as failure and affecting accuracy

Inactive Publication Date: 2019-04-12
SHANGHAI YIDIAN SCI INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] According to the national standard GB / T5750.11-2006 "Drinking Water Quality Inspection Method Disinfectant Indicators", the test reagents for residual chlorine and total chlorine need to be prepared into a liquid with a certain concentration, and then tested. It must be stored in a brown bottle and kept in the refrigerator, otherwise it will become invalid soon and affect the accuracy of the measurement

Method used

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Embodiment Construction

[0047] The invention includes indicator, residual chlorine buffer and total chlorine buffer.

[0048] The indicator also includes indicator solvent and indicator powder, which are dissolved and mixed before use, and stored in a brown bottle. The indicator solvent is about 1mol / L sulfuric acid solution; the indicator powder is anhydrous DPD sulfate and EDTA disodium, which is mixed with indicator solvent to contain 1.1g / L anhydrous DPD sulfate and 2g / L EDTA disodium liquid.

[0049] Chlorine buffer is a mixture containing 1mol / L sodium citrate and 1mol / L sodium hydroxide.

[0050] The total chlorine buffer is a residual chlorine buffer containing 10% potassium iodide, and the two are mixed before use.

[0051] When measuring, mix the water sample to be tested with the indicator and residual chlorine buffer (or total chlorine buffer) in a ratio of 10:1:1, and measure with a spectrophotometer or colorimeter within 2 minutes.

[0052] The specific implementation manners of the ...

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Abstract

The invention provides a detection agent for detecting residual chlorine / total chlorine in water, a preparation method and a detection method thereof. The detection agent for detecting residual chlorine comprises a reagent A and a reagent B. The reagent A is an indicator, and the indicator is a mixed solution containing 1.1 g / L of anhydrous DPD sulfate and 2 g / L of EDTA disodium. The reagent B isa residual chlorine buffer solution, and the residual chlorine buffer solution is a mixed solution containing 1 mol / L of sodium citrate and 1 mol / L of sodium hydroxide. A total chlorine detection agent comprises a reagent A and a reagent C. The reagent C is a total chlorine buffer solution, and the total chlorine buffer solution is the residual chlorine buffer solution containing 10% of potassiumiodide.

Description

technical field [0001] The invention relates to a detection technology for residual chlorine / total chlorine content in water, which can be used for measuring the residual chlorine / total chlorine content in water by colorimetry, and belongs to the technical field of chemical analysis. It specifically relates to a detection agent for detecting residual chlorine / total chlorine content in water, a preparation method and a detection method thereof. Background technique [0002] At present, the state requires that all centralized water supply and factory water should be disinfected, and the remaining amount of disinfectant in the factory water and the water at the end of the pipe network should meet the national standard GB5749-2006 "Drinking Water Hygienic Standard". There are many kinds of disinfectants for water disinfection. Traditional disinfectants include chlorine gas or liquid chlorine, while emerging ones include chlorine dioxide, ozone, ultraviolet rays, etc. Correspond...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/78
CPCG01N21/31G01N21/78
Inventor 马丽
Owner SHANGHAI YIDIAN SCI INSTR
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