Determination of copper, lead, zinc, cadmium, chromium, nickel and arsenic in road dust by inductively coupled plasma mass spectrometry with acid digestion in closed system
1. Hebei Research Center for Geoanalysis, Baoding 071051, China; 2. Key Laboratory of Mineral Resources and Ecological Environment Monitoring,Hebei Province, Baoding 071051, China
Abstract：The accurate determination of heavy metals (Cu, Pb, Zn, Cd, Cr, Ni and As) in road dust samples is of great significance for the prevention and control of environmental pollution in urban roads. The samples were digested by acid dissolution in closed system in HF-HNO3 system. 52Cr, 60Ni, 63Cu, 66Zn, 75As, 111Cd and 208Pb were selected as the measuring isotopes. The contents of Cr and As were determined by collision reaction cell technique using mode of He. The determination results of Cd were corrected by the interference correction equation equipped in the instrument. Consequently, the determination method of Cu, Pb, Zn, Cd, Cr, Ni and As in road dust samples by inductively coupled plasma mass spectrometry (ICP-MS) was established. The sample dissolution conditions were optimized. The results showed that 0.1 g of sample could be fully dissolved by 7.0 mL of mixed acid (HF∶HNO3=1∶6, volume ratio) after digestion in closed system at 160 ℃ for 2 h. Under the optimized experimental conditions, the correlation coefficient of the calibration curve was higher than 0.999. The limit of detection ranged from 0.012 to 0.096 μg/g, and the limit of quantification was between 0.040 μg/g and 0.32 μg/g. The proposed method was applied to the determination of Cu, Pb, Zn, Cd, Cr, Ni and As in road dust samples. Moreover, the spiked recovery tests were also conducted. The relative standard deviations (RSD, n=12) of determination results were all less than 4%, and the spiked recoveries were between 95% and 104%. The road dust samples were analyzed according to the experimental method. The measurement results were basically consistent with those obtained by high-pressure microwave digestion-ICP-MS for Cu, Pb, Zn, Cd, Cr and Ni, and hydride generation atomic fluorescence spectrometry (HG-AFS) for As.
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