Abstract：Mercury and arsenic belong to the controlled elements in soil environmental quality monitoring. Due to the great difference in content between two elements, it is difficult to accurately determine them simultaneously by hydride generation-atomic fluorescence spectrometry. If inductively coupled plasma atomic emission spectrometry (ICP-AES) are employed to determine arsenic and mercury, the problem is that the sensitivity is low.A simple hydride generation device combined with inductively coupled plasma atomic emission spectrometer (HG-ICP-AES) was self-made for the simultaneous determination of mercury and arsenic in soil. The soil sample was digested with aqua regia (1+1). The acidity of sample solution was kept at 15% containing 15 g/L potassium borohydride as the reducing agent. The optimal working conditions of ICP-AES were as follows: the incident power was 1 450 W, the peristaltic pump speed was 1.7 mL/min, the plasma gas flow was 16 L/min, and the atomizing gas flow was 0.45 L/min. The linear range of mercury and arsenic was 0.50-10.0 μg/L and 5.00-100 μg/L, respectively. The linear correlation coefficients were both 0.999 8. The limits of detection of mercury and arsenic were 0.016 μg/g and 0.12 μg/g, and limits of quantification were 0.064 μg/g and 0.48 μg/g, respectively. The contents of mercury and arsenic in certified reference materials and actual samples of soil were determined according to the experimental method. The measured values of reference materials were consistent with the certified values. The relative standard deviations (RSD, n=6) of determination results for the actual sample were between 3.1% and 4.8%. Meanwhile, the contents of mercury and arsenic in actual sample of soil were determined according to the experimental method and atomic fluorescence spectrometry. The t test indicated that the determination results of two methods had no significant difference. The proposed method was suitable for the simultaneous determination of mercury and arsenic in soil.
王记鲁, 郝苗青, 李静, 王鑫, 刘跃. 氢化物发生-电感耦合等离子体原子发射光谱法测定土壤中汞和砷[J]. 冶金分析, 2023, 43(5): 74-78.
WANG Jilu, HAO Miaoqing, LI Jing, WANG Xin, LIU Yue. Determination of mercury and arsenic in soil by hydride generation- inductively coupled plasma atomic emission spectrometry. , 2023, 43(5): 74-78.
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