Determination of hexavalent chromium in soil and solid waste by inductively coupled plasma atomic emission spectrometry with internal standard correction
LAN Lüdeng, LI Jiayu, TAN Qingyue, JIA Haifeng, SUN Meng, WANG Feng*
Hubei Institute of Metallurgical Geology(Central South Institute of Metallurgical Geology),Yichang 443003,China
Abstract：During the determination of chromium(Ⅵ) in soil and solid waste by inductively coupled plasma atomic emission spectrometry(ICP-AES),the matrix effect and instrument fluctuation caused by high salts usually result in large analysis error. The content of molybdenum in nature is low, and its excitation potential and ionization potential are close to those of chromium. Moreover, the analytical lines have no interference mutually.The sample was digested with the system of alkali-magnesium chloride-phosphate buffer solution. Molybdenum was selected as the internal standard element. The determination of chromium(Ⅵ) in soil and solid waste by ICP-AES with internal standard correction was realized. The internal standard element of molybdenum was introduced into each sample online through the three-way valve of sampler in instrument. The salts in sample were diluted and each sample was monitored. The limit of detection of method was 0.018 mg/kg, and the linear correlation coefficient of the calibration curve was 0.999 985. The proposed method was applied for the determination of chromium(Ⅵ) in certified reference materials of soil (GBW(E)070252 and GBW(E)070255) and solid waste samples(TRY-1, etc.). The relative standard deviations (RSD, n=10) of determination results were between 0.95% and 4.6%. The found results of certified reference materials of soil were consistent with the certified values. The recoveries of solid waste samples(TRY-3,etc.) were between 96% and 105%.
兰绿灯, 李佳玉, 谭清月, 贾海峰, 孙猛, 王峰. 内标校正-电感耦合等离子体原子发射光谱法测定土壤与固体废物中铬(Ⅵ)[J]. 冶金分析, 2023, 43(10): 54-59.
LAN Lüdeng, LI Jiayu, TAN Qingyue, JIA Haifeng, SUN Meng, WANG Feng. Determination of hexavalent chromium in soil and solid waste by inductively coupled plasma atomic emission spectrometry with internal standard correction. , 2023, 43(10): 54-59.
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