CAJ | 학술논문

[目的]以氯化镉(CdCl2)为供试污染物,通过人工模拟试验研究重金属重大污染事故发生时CdCl2污染物在土体中沿横向及纵向的迁移过程和特征,为重大环境污染事件的快速处理提供理论依据.[方法]采用柱淋滤装置,模拟2阶段降雨条件下CdCl2在土壤层中的横向与纵向迁移分布特征,试验周期16 d,采用便携式手控负压泵抽取土壤溶液样品,溶液中Cd含量采用原子吸收分光光度法测定.[结果]在整个试验期间,重金属Cd呈现明显的横向和纵向分布特征,CdCl2 在投加后0.5 h即覆盖表层横断面,146 h覆盖整个纵剖面.Cd浓度的纵向相对变化速率分析表明,不同深度Cd污染物快速通过的时间不同,15、35和55 cm深度处Cd污染物快速通过的时间分别约为48、117和266 h.[结论]该箱体模拟装置可以同时考察污染物在土壤中沿横向和纵向的分布及迁移特征;较大降雨条件下重金属Cd污染物在土壤表面先以横向径流扩散为主,纵向迁移相对滞后.
[목적]이록화력(CdCl2)위공시오염물,통과인공모의시험연구중금속중대오염사고발생시CdCl2오염물재토체중연횡향급종향적천이과정화특정,위중대배경오염사건적쾌속처리제공이론의거.[방법]채용주림려장치,모의2계단강우조건하CdCl2재토양층중적횡향여종향천이분포특정,시험주기16 d,채용편휴식수공부압빙추취토양용액양품,용액중Cd함량채용원자흡수분광광도법측정.[결과]재정개시험기간,중금속Cd정현명현적횡향화종향분포특정,CdCl2 재투가후0.5 h즉복개표층횡단면,146 h복개정개종부면.Cd농도적종향상대변화속솔분석표명,불동심도Cd오염물쾌속통과적시간불동,15、35화55 cm심도처Cd오염물쾌속통과적시간분별약위48、117화266 h.[결론]해상체모의장치가이동시고찰오염물재토양중연횡향화종향적분포급천이특정;교대강우조건하중금속Cd오염물재토양표면선이횡향경류확산위주,종향천이상대체후.
[Objective] The migration process and feature of CdCl2 in the vertical and horizontal profiles of soil were studied by the stimulating experiment to present the theory for the treatment of significant pollution accident. [Method] The column leaching device was taken to simulate the vertical and horizontal migration of CdCl2 in the soil profile under two-phase rainfall during 16 days. The portable manual control negative pressure pump was taken to extract soil solution sample and the Cd concentration was determined by the atomic absorption spectrophotometer. [Result] During the whole experiment, the obvious horizontal and vertical migration features of CdCl2 appeared. The CdCl2 covered the whole horizontal profile in 0.5 h and the whole vertical profile in 146 hours. The relative variation rate of Cd in the different depth of bulk showed that the rapid passing time differed in the different depths. In the depth of 15, 35 and 55 cm, the rapid passing time were about 48, 117 and 266 h, respectively. [Conclusion] The simulating device used in this paper could well investigate the vertical and horizontal distribution and migration of contaminant. Under the condition of greater rainfall, the CdCl2 gave priority to the horizontal runoff in the surface soil, followed by the vertical migration.