Novel method for measuring content of zinc in alkaline zinc-nickel alloy plating solution

A technology of nickel alloy and zinc content, which is applied in chemical analysis by titration, material analysis by observing the impact on chemical indicators, and analysis by chemical reaction of materials, etc., can solve insecurity, environmental pollution, etc. question

Active Publication Date: 2015-08-19
江苏大春电力器材有限公司
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Problems solved by technology

Using this method has unsafe factors for laboratory management and operation, and if the waste liquid is not treated, it will also pollute the environment

Method used

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Embodiment

[0025] Prepare the following reagents:

[0026] Bromothymol blue indicator: Dissolve 0.1g of bromothymol blue in 3mL of 0.05mol / L sodium hydroxide solution, add water to 100mL.

[0027] (1+1) hydrochloric acid: the volume ratio of concentrated hydrochloric acid to water is 1:1.

[0028] Ethanol solution of dimethylglyoxime: dimethylglyoxime ethanol solution with a mass concentration of 50 g / L.

[0029] Ammonia-ammonium chloride buffer solution with pH=10: Dissolve 27g of ammonium chloride in water, 175mL of concentrated ammonia water with a density of 0.89g / mL, and dilute to 1L with water.

[0030] Chrome black T indicator: Grind and mix 0.2g of chrome black T with 100g of sodium chloride.

[0031] EDTA standard solution: 0.05mol / L.

[0032] Draw 2 mL of alkaline zinc-nickel alloy plating solution into a 50 mL volumetric flask, add 30 mL of water to dilute, add 2 to 4 drops of bromothymol blue indicator, add (1+1) hydrochloric acid with a dropper until the test solution cha...

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Abstract

The invention discloses a method for analyzing zinc in an alkaline zinc-nickel alloy plating solution. The method comprises the steps of enabling Ni<2+> ions in the alkaline zinc-nickel alloy plating solution and dimethylglyoxime to generate precipitate under the condition the pH is equal to 4-6; filtering and separating the precipitate; then, measuring the content of the zinc in the filtrate; under the condition that the pH is equal to 10, taking chrome black T as an indicator, and titrating the zinc by ethylene diamine tetraacetic acid (EDTA) standard solution. According to the method, nickel is separated by a precipitation separation method, zinc is measured by titration, and the used reagents are non-toxic and harmless. The existing method adopts potassium cyanide to screen nickel, so that potential safety hazard is brought to laboratory management, and the environment is polluted.

Description

technical field [0001] The invention relates to an analysis method for zinc in an alkaline zinc-nickel alloy plating solution. Background technique [0002] The analysis of zinc content in alkaline zinc-nickel alloy plating solution currently adopts EDTA volumetric method [1] , use highly toxic substance potassium cyanide to mask nickel, add formaldehyde to make excess cyanide produce highly toxic substance hydroxyacetonitrile [2] . The use of this method has unsafe factors for laboratory management and operation, and if the waste liquid is not treated, it will also pollute the environment. For this reason, a precipitation separation-EDTA volumetric method was developed, nickel was separated by precipitation with dimethylglyoxime, and zinc was titrated with EDTA. [0003] References: [1] Xu Hongdi, Zou Qun. Electroplating solution analysis technology [M]. Beijing: Chemical Industry Press, 2003.259-260. [2] Wang Jiguang, Wang Li, Chen Changfa, et al. Two cases of acute hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N21/79
Inventor 赖奂汶郭崇武
Owner 江苏大春电力器材有限公司
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