title: [Determination of heavy metals in artificial soil on railway rock-cut slopes by microwave digestion-AAS].
abstract: 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.
authors.affiliation: Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu 610064, China. chenzhaoqiong@126.com
authors.forename: Zhao-Qiong
authors.initials: ZQ
authors.lastname: Chen
authors.forename: Chen
authors.initials: C
authors.lastname: Fang
authors.forename: Ying-Wei
authors.initials: YW
authors.lastname: Ai
authors.forename: Hong-Ying
authors.initials: HY
authors.lastname: Gao
authors.forename: Dan-Dan
authors.initials: DD
authors.lastname: Pan
authors.forename: Xin-Yue
authors.initials: XY
authors.lastname: Li