Method for measuring nickel content in copper alloy by use of dimethylglyoxime spectrophotometric method

A spectrophotometry, diacetyl oxime technology, applied in the measurement of color/spectral characteristics, etc., to ensure the effect of ensuring precision, ensuring accuracy, and ensuring product quality

Inactive Publication Date: 2013-03-20
GUIZHOU AEROSPACE PRECISION PRODS
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a method for measuring the nickel content in copper alloys with dimethylglyoxime spectrophotometry, and solve the technical problem of accurate determination of nickel content in copper alloys, especially low nickel content

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with embodiment.

[0022] Sample test of the present invention is done blank test simultaneously.

[0023] Sample test: Weigh 1g of the sample (accurate to 0.0001g), estimate the copper content in the sample, add pure copper (nickel-free) to the sample to make the amount of copper in the sample reach 1g, and then add the copper Put the sample into a 200mL beaker, add 20mL hydrochloric acid (1+1), and add 10mL hydrogen peroxide (ρ1.10g / mL) solution in small portions to dissolve, cool until the violent reaction stops. When the sample is completely dissolved, heat the solution to boil and continue to boil for 1min to remove excess hydrogen peroxide, cool to room temperature, and transfer the solution into a 500mL volumetric flask. Dilute to the mark with water and mix well.

[0024] Use a pipette to pipette 25mL of the sample solution into a 250mL separatory funnel, add 5mL of hydroxylammonium...

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Abstract

The invention discloses a method for measuring nickel content in a copper alloy by use of a dimethylglyoxime spectrophotometric method. The method comprises the following steps of: dissolving a copper alloy sample with acid; separating nickel from the sample solution by use of a dimethylglyoxime complex in a pH range from 6.5 to 7.2 of the solution; extracting the complex by use of trichloromethane; and measuring the nickel content by use of the spectrophotometric method. The measured nickel content is less than or equal to 0.50%m/m. According to the invention, by adopting a method of adjusting the consistency of matrix copper content in the sample solution, separating nickel by use of dimethylglyoxime-ethanol and filtering the color development liquid with absorbent cotton, the shortcomings of the GB/T5121.5-2008 method IV are overcome, and the measurement accuracy is guaranteed. The method disclosed by the invention is suitable for measuring nickel content which is not greater than 0.50%m/m in the copper alloy.

Description

technical field [0001] The invention relates to detection technology of nickel content in copper alloy, in particular to a method for measuring nickel content in copper alloy by dimethylglyoxime spectrophotometry. Background technique [0002] Nickel is one of the important alloying elements. The nickel content in copper and copper alloys will greatly affect the properties of copper and copper alloys. Therefore, the industry needs to determine the nickel content in copper and copper alloys. The existing technical solution for the determination of nickel content in copper alloys is the fourth method disclosed in the national standard "Chemical Analysis of Nickel Content in Copper and Copper Alloys (GB / T5121.5-2008)", that is, dimethylglyoxime spectrophotometry. The method is to separate the nickel from the ammonia solution of the sample by precipitating the dimethylglyoxime complex, extract the complex with chloroform, then evaporate the organic matter, digest the complex, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
Inventor 李正权
Owner GUIZHOU AEROSPACE PRECISION PRODS
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