岩石边坡创面人工土壤的重金属含量直接关系到边坡植被的恢复。 优化了微波消解-原子吸收分光光度法（AAS）的分析条件, 建立了测定人工土壤中重金属元素的方法, 分析评价了铁路岩石边坡人工土壤的重金属污染状况。 结果表明: 最佳消解体系为HNO3-H2O2-HF, 回收率在95%～105%之间、 精密度和相对偏差分别小于4%和5%。 铁路岩石边坡创面人工土壤中Cd, Pb, Zn的浓度显著高于对照土壤, 其浓度分别为对照土壤的4.7, 1.3, 1.2倍; 但Cr, Cu, Fe的浓度与对照土之间无显著差异。 本研究为人工土壤中重金属元素的测定提供了可靠方法, 为铁路岩石边坡的治理提供依据。

The purpose of this paper is as follows: (1) Optimizing the parameters of microwave digestion-atomic absorption spectroscopy (AAS) and establishing method for the determination of heavy metals in artificial soils. (2) Evaluating heavy metal pollution conditions in artificial soil samples from railway rock-cut slopes. The results showed that the mixture of HNO3-H2O2-HF was found to have the best digestion efficiency; under the optimized conditions, the recoveries of the method ranged from 95% to 105%; the measurement precision and the relative deviation were less than 4% and 5%, respectively; the concentrations of Cd, Pb and Zn were significantly higher in the artificial soil on railway rock-cut slope than in the control soil, and they were 4.7, 1.3 and 1.2 times as much as the control soil, respectively; compared to the contents of Cr, Cu and Fe in control soils, there was no significant difference. This research will provide a reliable method for determining metal elements in artificial soils on rock-cut slopes and a theoretical basis for the management of the railway rock-cut slopes.