Heavy metal pollution in soil-plant system is of major environmental concern on a world scale and in China in particular with the rapid development of industry. The heavy metal pollution status in soil-plant system in...Heavy metal pollution in soil-plant system is of major environmental concern on a world scale and in China in particular with the rapid development of industry. The heavy metal pollution status in soil-plant system in China, the research progress on the bioavailability of heavy metals (affecting factors, extraction methods, free-ion activity model, adsorption model, multivariate regression model, Q-I relationship, and compound pollution), and soil remediation are reviewed in the paper. Future research and monitoring is also discussed.展开更多
文摘Heavy metal pollution in soil-plant system is of major environmental concern on a world scale and in China in particular with the rapid development of industry. The heavy metal pollution status in soil-plant system in China, the research progress on the bioavailability of heavy metals (affecting factors, extraction methods, free-ion activity model, adsorption model, multivariate regression model, Q-I relationship, and compound pollution), and soil remediation are reviewed in the paper. Future research and monitoring is also discussed.
文摘提出了加速溶剂萃取联合凝胶色谱净化-气相色谱-质谱法同时测定土壤中21种酚类化合物含量的方法。取研细过筛后的土壤样品(含水率15%~20%)10 g,加入6 g硅藻土混匀并研磨,置于萃取罐中,以体积比2∶1的二氯甲烷-正己烷混合溶液于120℃进行加速溶剂萃取,萃取液经无水硫酸钠脱水,再用二氯甲烷充分淋洗无水硫酸钠,合并全部有机相,浓缩至1 m L,通过凝胶色谱进行净化,收集9~18 min的流出液,浓缩至1 m L,在HP-5MS色谱柱上按照柱升温程序分离,质谱分析采用全扫描(SCAN)模式。结果表明,21种酚类化合物的质量浓度在2.50~50.0 mg·L^(-1)内与对应的峰面积呈线性关系,检出限(3.143s)为0.02~0.07 mg·kg^(-1)。按照标准加入法进行回收试验,回收率为73.4%~107%,测定值的相对标准偏差(n=6)均不大于17%。方法用于2份土壤样品分析,21种酚类化合物均未检出。方法用于土壤质控样品分析,21种酚类化合物的测定值均在认定值的不确定度范围内。
