Determination of Heavy Metal Elements in Diatomite Filter Aid by Inductively Coupled Plasma Mass Spectrometry
NIE Xi-du1, FU Liang2*
1. Department of Material and Chemical Engineering, Hunan Institute of Technology, Hengyang 421002, China 2. College of Chemistry and Chemical Engineering, Yangtze Normal University, Fuling 408100, China
Abstract：This study established a method for determining Be, Cr, Ni, As, Cd, Sb, Sn, Tl, Hg and Pb, total 10 heavy metals in diatomite filter aid. The diatomite filter aid was digested by using the mixture acid of HNO3+HF+H3PO4 in microwave system, 10 heavy metals elements were determined by inductively coupled plasma mass spectrometry (ICP-MS). The interferences of mass spectrometry caused by the high silicon substrate were optimized, first the equipment parameters and isotopes of test metals were selected to eliminate these interferences, the methane was selected as reactant gas, and the mass spectral interferences were eliminated by dynamic reaction cell (DRC). Li, Sc, Y, In and Bi were selected as the internal standard elements to correct the interferences caused by matrix and the drift of sensitivity. The results show that the detection limits for analyte is in the range of 3.29～15.68 ng·L-1, relative standard deviations (RSD) is less than 4.62%, and the recovery is in the range of 90.71%～107.22%. The current method has some advantages such as, high sensitivity, accurate, and precision, which can be used in diatomite filter aid quality control and safety estimations.
Key words：Diatomite filter aid;Inductively coupled plasma mass spectrometry;Heavy metal;Internal standard elements;Dynamic reaction cell
聂西度1，符 靓2* . 电感耦合等离子体质谱法测定硅藻土助滤剂中的重金属元素 [J]. 光谱学与光谱分析, 2015, 35(11): 3192-3195.
NIE Xi-du1, FU Liang2* . Determination of Heavy Metal Elements in Diatomite Filter Aid by Inductively Coupled Plasma Mass Spectrometry. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(11): 3192-3195.
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