Dust samples collected from the Beijing metropolitan area （China） were evaluated to determine the distribution and the concentration of platinum group elements （PGEs）. The dust particles that were smaller than 100 mesh size fraction （150 μm） were analyzed after aqua regia digestion. Concentrations ofPt, Rh, and Pd were found to be between 3.96 and 356.3 ng/g, 2.76 and 97.11 ng/g, and 0.1 and 124.9 ng/g, respectively, in the urban areas of Beijing, whereas for the background samples collected from the suburbs of Beijing, the concentrations of Pt, Pd, and Rh were very low and ranged from 0.1 to 0.9 ng/g, 0.5 to 1.4 ng/g, and 0.8 to 2.2 rig/g, respectively. The distributions of PGEs in road dust were an accurate reflection of the levels of pollution and were found to match with the local traffic conditions. A strong positive correlation was established among all the dements found in road dust. This suggests that emissions of abraded fragments from vehicle exhausts may be the source of the high concentration of Pt, Rh, and Pd in road dust along the main roads of Beijing.
考察了微波消解-电感耦合等离子体质谱（ICP-MS）法同时测定土壤、沉积物等样品中的12种元素的方法.结果表明，由3 mL HNO3-1 ml HCl-1 mL HF组成的混合酸对土壤、沉积物具有较好的消解能力.5种标准物质的测定结果表明，该方法快速简便、准确度高、精密度好是一种土壤、沉积物样品中多元素同时测定的广普方法.各元素的检出限为0.01-3.64 ng·g^-1RSD〈3.64%.
