溶解性有机质对煤矿区重金属迁移的影响

Effects of dissolved organic matter on migration of heavy metals in coal mine

采用土柱淋滤实验模拟研究了天然有机质对煤矿区重金属迁移过程中的影响。结果表明:示踪剂Cl-显示有溶解性有机质和无溶解性有机质淋滤液穿透土柱时间都为6h,而Cu穿透土柱的时间较Cl-时间有所滞后,说明土壤阻滞了Cu的迁移,其中有溶解性有机质的总Cu淋滤液穿透土柱时间为15h,而无溶解性有机质的总Cu淋滤液穿透土柱的时间为24h,说明溶解性有机质有利于总Cu向下迁移。自由态Cu2+出水含量表明溶解性有机质和Cu以有机结合态形式存在是有利于Cu向下迁移的主要因素。

The effects of naturally dissolved organic matter on the migration of heavy metals have been simulated by the soil column experiment. The results showed that indicated by Cl^- which was used as tracer, the penetration time of leachate with DOM or without DOM were both 6 h; however, the penetration time of total Cu lagged behind the Cl^-, implying that the soil prevented the migration of Cu. The penetration time of total Cu in the leachate with DOM was 15 h while it was 24 h in the leachate without DOM. From the penetration time, it can be found that the DOM can favor the migration of total Cu. The free Cu concentration in effluent water indicated that combined forms of Cu with DOM were a main factor in favor of the migration of Cu.