摘要
为进一步提高污染场地控制与修复实验课的教学效果,从实验装置、实验条件对重金属在含水层的迁移实验进行了方案设计。实验采用自主设计的二维有机玻璃模拟槽作为实验装置,以硝酸镉为目标污染物,利用原子吸收分光光度计进行定量测定。优化后的实验结果显示:(1)Cd^(2+)在地下水中的迁移锋面随着污染泄露时间延长在垂向和纵向上不断推进;(2)切断污染源后,7号取样口Cd^(2+)浓度逐渐下降,11号取样口Cd^(2+)浓度短暂上升后,逐渐下降;(3)地下水流速较快,Cd^(2+)在纵向的迁移速度大于垂向,对流作用明显;流速较慢时,Cd^(2+)在纵向的迁移速度小于垂向的迁移速度,弥散作用显著。
In order to improve the experiment teaching effect of pollution control and remediation course and cultivate undergraduate innovation practice ability,design and optimization of heavy metal migration experiments in aquifer are carried out from two aspects of experimental equipment and experimental conditions. A small two-dimensional plexiglass simulation tank is used as experimental device. Cadmium nitrate is chosen as the target pollutant and quantitatively determined by atomic absorption spectrophotometer. The optimized experiment results are shown：（1）Cd2＋ migration front is prolonged in the vertical and longitudinal in the groundwater with the extension of the leakage time;（2） Cd2＋ concentration of sampling Port 7 decreases gradually after cutting off the pollution source,while increases gradually and then decreases gradually in sampling Port 11;（3） The groundwater flow rate is faster,the vertical migration velocity of Cd2＋ is larger than the vertical direction,and the convection action is obvious. When the flow velocity is slower,the longitudinal migration velocity of Cd2＋ is smaller than the vertical direction,and the dispersion effect is remarkable.
作者
白静
赵勇胜
秦传玉
BAI Jing;ZHAO Yongsheng;QIN Chuanyu(Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China)
出处
《实验室研究与探索》
CAS
北大核心
2018年第4期45-48,共4页
Research and Exploration In Laboratory
基金
国家自然科学基金项目(3A412S251425)
关键词
重金属
含水层
迁移
实验设计与优化
heavy metal
aquifer
migration
experimental design and optimization
