Residual chlorine analysis method

An analysis method, the technology of residual chlorine, which is applied in the direction of analyzing the chemical reaction of the material, material analysis by observing the influence of the chemical indicator, color/spectral characteristic measurement, etc., can solve the inaccurate determination result of residual chlorine, etc. problems, to achieve the effects of low toxicity, improved reliability and accuracy, and low reagent consumption

Pending Publication Date: 2020-07-31
LIHE TECH (HUNAN) CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides two residual chlorine analysis methods to solve the technical problem that the existing DPD spectrophotometric method for determining

Method used

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  • Residual chlorine analysis method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0059] Example 1

[0060] The sample analyzed was tap water.

[0061] Take 10ml of the tap water sample to the detection cell of the residual chlorine automatic analyzer, slowly add 0.5ml of disodium hydrogen phosphate buffer solution, add 0.5ml of DPD sulfate chromogenic reagent solution, mix evenly, make the color development complete, and record the absorbance signal at this time The value V1 was 0.3242, 0.5 mL of 0.5% sodium dichloroisocyanurate was added, and the mixture was evenly mixed, so that the generated red complex was completely faded, and the recorded absorbance signal value V2 at this time was 0.1271.

[0062] Substitute the values ​​of V1-V2 into the standard curve, and calculate the residual chlorine concentration of the tap water sample to be 0.397 mg / L.

Example Embodiment

[0063] Example 2

[0064] The sample analyzed was tap water.

[0065] Take 10ml of tap water sample to the detection cell of the automatic analyzer, slowly add 0.5ml of disodium hydrogen phosphate buffer solution, add 0.5ml of 0.5% sodium dichloroisocyanurate, add 0.5ml of DPD sulfate color developer solution, mix well, record The absorbance signal value V3 at this time is 0.1187,

[0066] After cleaning the instrument, take another 10ml of tap water sample to the detection cell of the automatic analyzer, slowly add 0.5ml of disodium hydrogen phosphate buffer solution, add 0.5ml of DPD sulfate chromogenic reagent solution, mix evenly, make the color development complete, and record this time The absorbance signal value V4 is 0.3144,

[0067] The value of V4-V3 was substituted into the standard working curve, and the concentration of residual chlorine in the sample was calculated to be 0.394 mg / L.

Example Embodiment

[0068] Example 3

[0069] The analysis sample is a water sample with a large turbidity and chromaticity. The yellow soil is used as the matrix, and the water sample is prepared with tap water. After mixing evenly, the measured turbidity is 148NTU.

[0070] Take 10ml of the above sample to the detection cell of the automatic residual chlorine analyzer, slowly add 0.5ml of disodium hydrogen phosphate buffer solution, add 0.5ml of 0.5% sodium dichloroisocyanurate, add 0.5ml of DPD sulfate color developer solution, mix well , record the absorbance signal value V5 at this time as 0.3426;

[0071] After cleaning the instrument, re-extract 10ml of the above-mentioned sample to the detection cell of the residual chlorine automatic analyzer, slowly add 0.5% of disodium hydrogen phosphate buffer solution, add 0.5ml of DPD sulfate chromogenic reagent solution, mix evenly, and make the color development complete, record this. When the absorbance signal value V6 is 0.4679;

[0072] Subst...

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Abstract

The invention discloses a residual chlorine analysis method. The method comprises the following steps: adding a buffer solution into the to-be-detected sample to adjust the pH value; adding a DPD acidic salt color developing agent; uniform mixing, obtaining a first absorbance signal value V1 after the residual chlorine in the sample and the DPD acidic salt color developing agent are completely developed; and adding a strong oxidant into the completely developed solution to decompose a complex generated by the residual chlorine and the DPD acidic salt color developing agent to completely fade,so as to obtain a second absorbance signal value V2, substituting the V1-V2 values into the standard working curve, and calculating to obtain the concentration of the residual chlorine in the sample.According to the method, the influence of interference such as turbidity and chromaticity on residual chlorine determination is deducted by adopting an in-situ background interference deducting mode,the method is simple and easy to operate, low in reagent consumption and toxicity and particularly suitable for determining residual chlorine in samples with large chromaticity and turbidity and highinterference, and the reliability and accuracy of residual chlorine determination results can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of water quality detection, in particular to an analysis method for residual chlorine in water samples, and is especially suitable for accurately measuring the content of residual chlorine in water samples when the turbidity and chromaticity in the water samples are relatively large. Background technique [0002] The commonly used disinfectant in tap water and wastewater treatment is sodium hypochlorite (84 disinfectant). If the amount of disinfectant used is too much, it will cause waste of raw materials and cause great harm to the environment. If the disinfectant content is too low, It will affect the disinfection effect, and the rational use of disinfectants is particularly important. [0003] Residual chlorine is a commonly used detection index in the use of disinfectants, so the concentration detection of residual chlorine in the disinfection process is very important. There are mainly the following met...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/31
CPCG01N21/78G01N21/31
Inventor 陈阳李威桓郭峰李刚
Owner LIHE TECH (HUNAN) CO LTD
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