微波消解/AAS测定铁路岩石边坡创面人工土壤中的重金属含量  

Determination of Heavy Metals in Artificial Soil on Railway Rock-Cut Slopes by Microwave Digestion-AAS

作　　者：陈朝琼[1,2] 房晨[1] 艾应伟[1] 高宏英[1] 潘丹丹[1] 李新月[1] 

机构地区：[1]四川大学生命科学学院,生物资源与生态环境教育部重点实验室,四川成都610064 [2]成都医学院公共卫生学系,四川成都610083

出　　处：《光谱学与光谱分析》2013年第8期2215-2218,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(41171175);国家基础科学人才培养基金项目(J1103518)资助

摘　　要：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 1.2times 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.

关 键 词：微波消解 原子吸收 人工土壤 重金属元素 

分 类 号：O657.3[理学—分析化学]