Determination of hydrogen in copper and copper alloy by inert gas fusion infrared absorption method
LI Shaowen1, LIU Pan*2,3,4, CHEN Qianqian2, MENG Qiuda2
1. Chinalco Luoyang Copper Co., Ltd., Luoyang 471039,China; 2. Luoyang Ship Material Research Institute, Luoyang 471023,China; 3. National Key Laboratory for Marine Corrosion and Protection,Luoyang 471023,China; 4. Xiamen Sunrui Material Research Institute Co., Ltd.,Xiamen 361100,China
Abstract：Hydrogen is a harmful element in copper and copper alloys.The accurate and quantitative analysis of hydrogen is helpful to improve the product quality. In view of the lack of analytical method standard for hydrogen content in copper and copper alloys in China and abroad,the analysis method of hydrogen was added during the revision of GB/T 5121.8.The analysis method and parameter optimization for the determination of hydrogen in copper and copper alloys by inert gas fusion infrared absorption method were studied.The optimal operating conditions were obtained as below:the analysis power was 2.75 kW;the sample mass was 1-2 g;the flux was 1 g of tin; the standard crucible or duplex crucible was used for testing.The certified reference materials of steel were used to establish the calibration coefficients of the instrument.The limit of detection was 0.1 μg/g,and the limit of quantification was 0.4 μg/g,respectively.The recovery tests were carried out by adding certified reference material of potassium hydrogen phthalate and ammonium chloride separately according to the experimental method.The recoveries were between 90% and 115%.The proposed method was applied for the analysis of copper and copper alloy samples with hydrogen in range of 2-6 μg/g.The standard deviations of determination results were not higher than 0.5 μg/g,and the relative standard deviations (RSD,n=7) were between 5.2% and 9.1%.The analysis results were consistent with those verified by inter laboratory study or obtained by thermal conductivity method.
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