Novel method for testing zinc chloride in potassium chloride galvanization solution

A technology of potassium chloride and zinc chloride, applied in the direction of chemical analysis by titration, can solve problems such as the interference of zinc chloride measurement

Active Publication Date: 2018-11-20
GUANGZHOU ULTRA UNION CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] The present invention proposes a new method for measuring zinc chloride in potassium chloride galvanizing solution. The present invention uses sodium fluoride to cover calcium impurities under the condition of pH=9.2, uses chrome black T as indicator, and titrates chlorine with EDTA standard solution. Zinc ions in potassium chloride galvanizing solution solve the problem of calcium impurities interfering with the determination of zinc chloride

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  • Novel method for testing zinc chloride in potassium chloride galvanization solution

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Embodiment 1

[0036] Draw 2 mL of potassium chloride galvanizing solution to be tested into a 300 mL conical flask, add 50 mL of water to dilute, add 0.5 g of sodium fluoride, 0.3 g of ascorbic acid, 10 mL of ammonia-ammonium chloride buffer solution, and sodium dimethyldithiocarbamate Solution 10mL, add a little chrome black T indicator, after shaking well, the test solution turns purple, then titrate with EDTA standard solution until the test solution turns blue as the end point.

[0037] Calculate the mass concentration of zinc chloride in the potassium chloride galvanizing solution, and the calculation formula is: ρ(ZnCl 2 ) = 136.3cV / V 0 ; Among them, ρ(ZnCl 2 ) represents the mass concentration (g / L) of zinc chloride, 136.3 is the molar mass (g / mol) of zinc chloride, c is the amount concentration (mol / L) of the substance of EDTA standard solution, V is the consumption of EDTA standard solution Volume (mL), V 0 is the volume (mL) drawn of the potassium chloride galvanizing solution ...

Embodiment 2

[0042] Take 2 mL of potassium chloride zinc plating solution and place it in a 300 mL conical flask, add 70 mL of water to dilute, add 1 g of sodium fluoride, 0.4 g of ascorbic acid, 10 mL of ammonia-ammonium chloride buffer solution, and 10 mL of sodium dimethyldithiocarbamate solution, Add a little chrome black T indicator, and titrate with EDTA standard solution until the test solution changes from purple red to blue as the end point.

[0043] Calculate the mass concentration of zinc chloride in the potassium chloride galvanizing solution, and the calculation formula is: ρ(ZnCl 2 ) = 136.3cV / V 0 ; Among them, ρ(ZnCl 2 ) represents the mass concentration (g / L) of zinc chloride, 136.3 is the molar mass (g / mol) of zinc chloride, c is the amount concentration (mol / L) of the substance of EDTA standard solution, V is the consumption of EDTA standard solution Volume (mL), V 0 is the volume (mL) of the potassium chloride galvanizing solution absorbed.

[0044]Determine the mass...

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Abstract

The invention discloses a novel method for testing zinc chloride in a potassium chloride galvanization solution. The novel method comprises the following steps: under a condition that the pH value is9.2, shielding a calcium impurity and an aluminum impurity in a potassium chloride galvanization solution by using sodium fluoride, shielding a copper impurity by using sodium dimethylaminodithioformate, shielding an iron impurity by using ascorbic acid, taking eriochrome black T as an indicator, and carrying out titration on zinc chloride by using an EDTA (Ethylene Diamine Tetraacetic Acid) standard solution. By adopting the novel method, interference of the calcium impurity upon zinc chloride testing can be effectively eliminated, and the problem that a conventional analysis method for testing zinc chloride has a high analysis result can be solved.

Description

technical field [0001] The invention relates to an analysis method for an electroplating solution, in particular to an analysis method for zinc chloride in a potassium chloride galvanizing solution. Background technique [0002] The analysis of zinc chloride in potassium chloride galvanizing solution currently adopts EDTA volumetric method [1-2] , Method [1] mask iron impurities with triethanolamine, mask aluminum impurities with ammonium fluoride, and use 1-(2-pyridylazo)-2-naphthol (PAN) as indicator under the condition of pH=10, use EDTA titration of zinc chloride. Method [2] Use sodium dimethyl dithiocarbamate to mask copper impurities, use triethanolamine to mask iron impurities and aluminum impurities, use chrome black T as indicator under the condition of pH=10, and titrate zinc chloride with EDTA standard solution . [0003] The calcium content in the water in the Guizhou region of my country is high, and a certain amount of calcium impurities inevitably accumulat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 郭崇武
Owner GUANGZHOU ULTRA UNION CHEM LTD
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