Discussion of factors influencing precision and accuracyin determination of chromium and nickel in stainless steel by spark discharge atomic emission spectrometry
LU Fei
Technology Center of Shanxi Taigang Stainless Steel Co.,Ltd.,Taiyuan 030003,China
Abstract：The atomic emission spectrometry has been widely used in metallurgical industry such as iron and steel smelting. The rapid and accurate analysis of chromium and nickel in smelting process of stainless steel can effectively improve the production efficiency and reduce the production cost. The influencing factors in determination of chromium and nickel in stainless steel by spark discharge atomic emission spectrometry were discussed. It was found that the analytical precision of chromium and nickel was greatly affected by the exhaust pipe blocking of spectrometer, the cleanliness of electrode, the pollution and bad cooling of excitation platform as well as the ageing of electrical apparatus. Therefore, during the analysis of sample, it should be sure that the exhaust pipe was unblocked, the cooling of excitation platform was good, and the electrode and excitation platform should be also well cleaned. The determination accuracy of chromium and nickel was significantly influenced by the electrode spacing, argon pressure, instrumental maintenance period, vacuum degree, excitation point overlapping and the analysis temperature of sample. Therefore, the vacuum degree and argon pressure should be normal and stable; the instrument should be also irregularly maintained; the electrode spacing should be proper; the sample should be analyzed at room temperature; the excitation points could not be overlapped. In addition, the pollution of lens had little influence on the analysis of chromium and nickel. The determination precision and accuracy of chromium and nickel could be effectively improved by controlling the influencing factors. Consequently, the production efficiency could be improved and the smelting cost could be also effectively controlled.
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LU Fei. Discussion of factors influencing precision and accuracyin determination of chromium and nickel in stainless steel by spark discharge atomic emission spectrometry. , 2017, 37(10): 37-46.
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