Determination of cobalt with wide content range in stainless steel by glow discharge optical emission spectrometry
HU Weizhu, WANG Yapeng, MU Yinghua, TANG Yu, WANG Wei
Technical Center of Ben Gang Group Corporation, National and Local Joint Engineering Laboratory of Advanced Automotive Steel Development and Application Technology,Benxi 117000,China
Abstract：The cobalt content and its variation directly affect the properties of stainless steel. The accurate determination and strict control of cobalt content in stainless steel has important significance to guarantee and improve the properties of stainless steel. The instrumental parameters were optimized. Seven reference materials of stainless steel with different cobalt contents were selected to prepare the calibration curves. A method for the determination of cobalt with wide content range in stainless steel by glow discharge optical emission spectrometry(GD-OES) was established. The influence of instrument parameters on the determination of cobalt was investigated, and the optimized conditions were as follows: the discharge current was 45 mA; the discharge voltage was 1 100 V; the pre-burning time was 75 s; the integration time was 10 s. The experimental results showed that there was a good linear relationship between the spectral intensity of cobalt and its mass fraction in the range of 0.008%-1.55%, and the linear correlation coefficient was 0.990 5. The limit of detection was 1.2 μg/g, and the limit of quantification was 4.0 μg/g. The proposed method was applied to the determination of cobalt content in reference materials and actual samples of stainless steel. The results showed that the found results of reference materials were basically consistent with the certified values, and the relative standard deviations (RSD, n=9) were between 0.71% and 1.2%. For the actual samples, the determination results were 1.48%, 0.62% and 0.128%, respectively, which were basically consistent with those obtained by flame atomic absorption spectrometry in GB/T 223.65-2012 and the nitroso-R salt spectrophotometry in GB/T 223.22-1994. The RSDs (n=9) of determination results were between 1.1% and 1.6%.
胡维铸, 王亚朋, 牟英华, 唐语, 王伟. 辉光放电原子发射光谱法测定不锈钢中宽范围含量钴[J]. 冶金分析, 2023, 43(5): 27-31.
HU Weizhu, WANG Yapeng, MU Yinghua, TANG Yu, WANG Wei. Determination of cobalt with wide content range in stainless steel by glow discharge optical emission spectrometry. , 2023, 43(5): 27-31.
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