Method for determining detergent in electroplating wastewater by methyl green photometry

A technology of methyl green luminosity and electroplating wastewater, which is applied in the field of detection, can solve the problems of inconvenient operation and large amount of reagents, and achieve the effect of simple method

Inactive Publication Date: 2012-10-24
SUZHOU GUOHUAN ENVIRONMENT DETECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of detergent in this kind of electroplating wastewater is generally high. In the past, the methylene blue photometric method was commonly used for determination, and this method is mainly used

Method used

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  • Method for determining detergent in electroplating wastewater by methyl green photometry
  • Method for determining detergent in electroplating wastewater by methyl green photometry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1 : the method that methyl green photometry measures detergent in electroplating waste water, comprises the following steps:

[0015] (1) Instrument and reagent selection: 2.5g / L methyl green aqueous solution, buffer solution, chloroform, oscillator, UV / visible spectrophotometer, separating funnel and volumetric flask, wherein the 2.5g / L The L methyl green aqueous solution is extracted by chloroform until the chloroform layer is colorless, and the buffer solution includes glycine and sodium chloride, wherein the concentrations of glycine and sodium chloride are respectively 6g / L and 8g / L, and Adjust the pH value to 2.5 with hydrochloric acid;

[0016] (2) One-time extraction: Take 5ml of electroplating wastewater water sample, put it in a 70ml separatory funnel, add 25ml of deionized water, 15ml of buffer solution and 5ml of 2.5g / L methyl green aqueous solution into the separatory funnel, shake well Finally, add 15ml of chloroform, then vibrate in the shaker f...

Embodiment 2

[0019] Example 2 : the method that methyl green photometry measures detergent in electroplating waste water, comprises the following steps:

[0020] (1) Instrument and reagent selection: 2.5g / L methyl green aqueous solution, buffer solution, chloroform, oscillator, UV / visible spectrophotometer, separating funnel and volumetric flask, wherein the 2.5g / L The L methyl green aqueous solution is extracted by chloroform until the chloroform layer is colorless, and the buffer solution includes glycine and sodium chloride, wherein the concentrations of glycine and sodium chloride are respectively 7g / L and 7g / L, and Adjust the pH to 2.5 with hydrochloric acid.

[0021] (2) Primary extraction: Take 5ml of electroplating wastewater water sample, put it in a 60ml separatory funnel, add 15ml of deionized water, 10ml of buffer solution and 5ml of 2.5g / L methyl green aqueous solution into the separatory funnel, shake well Finally, add 10ml of chloroform, then vibrate in the shaker for 1mi...

Embodiment 3

[0024] Example 3 : the method that methyl green photometry measures detergent in electroplating waste water, comprises the following steps:

[0025] (1) Instrument and reagent selection: 2.5g / L methyl green aqueous solution, buffer solution, chloroform, oscillator, UV / visible spectrophotometer, separating funnel and volumetric flask, wherein the 2.5g / L L methyl green aqueous solution is extracted to the colorless chloroform layer by chloroform, and described buffer solution comprises glycine and sodium chloride, wherein the concentration of glycine and sodium chloride is respectively 8g / L and 6g / L, And adjust the pH value to 2.5 with hydrochloric acid;

[0026] (2) Primary extraction: Take 5ml of electroplating wastewater water sample, put it in a 60ml separatory funnel, add 20ml of deionized water, 12ml of buffer solution and 5ml of 2.5g / L methyl green aqueous solution into the separatory funnel, shake well Finally, add 12ml of chloroform, then vibrate in the shaker for 3m...

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Abstract

The invention relates to a method for determining a detergent in electroplating wastewater by methyl green photometry. The method is characterized by including the following steps of: (1) preparing a methyl green water solution with a concentration of 2.5g/L, a buffer solution, chloroform, an oscillator, an ultraviolet/visible spectrophotometer, a separating funnel, and a volumetric flask; (2) using chloroform for first extraction; (3) using chloroform for secondary extraction; and (4) utilizing the ultraviolet/visible spectrophotometer to determine the detergent content. By utilizing the methyl green water solution for determining the detergent content in the electroplating wastewater, the method of the invention makes the determined deviation less than 6% and the sample solution labeling recovery rate range from 92.9% to 103%, and is characterized by simplicity, accuracy and reliability.

Description

technical field [0001] The invention relates to a method for measuring detergent in electroplating wastewater, in particular to a method for measuring oily substances in water samples by methyl green photometry, and belongs to the technical field of detection. Background technique [0002] In the electroplating process, it is often necessary to add an appropriate amount of detergent such as polyoxyethylene fatty alcohol ether sodium sulfate to improve the quality and performance of metal electroplating. The content of detergent in this kind of electroplating wastewater is generally high. In the past, the methylene blue photometric method was commonly used for determination, and this method is mainly used for the determination of linear sodium benzene sulfonate, sodium alkyl sulfonate and sodium fatty alcohol sulfate, etc. Detergent, and the amount of reagents are relatively large, inconvenient to operate. Contents of the invention [0003] In order to solve the deficienci...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/33G01N1/28
Inventor 徐晓华
Owner SUZHOU GUOHUAN ENVIRONMENT DETECTION
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