Abstract：Sand-column simulations were designed to investigate charateristics of migration and transformation of Pb2+ and Cr6+ and their releasing mechanism flushed by rain water in the vadose zone. Experimental results indicated that the migration rate of hexavalent chromium was ten times more than that of lead in the vadose zone; and the migration rate of lead and hexavalent chromium was 7.25cm/d and 0.4cm/d in the coarse sand and 4.46cm/d and 0.36cm/d in the fine sand, respectively. Reduction reaction of hexavalent chromium was not a dominant process in the vadose zone; the trivalent chromium was not detected in the water, and the content was 0.006mg/kg in the vadose media. The removal efficiency of Pb2+ was 0.056% and 0.112%, and Cr2O72- was 62.33% and 40.36% for fine sand and coarse sand columns flushed by rain water, respectively. Therefore, the mobility of Cr2O72- was high in the vadose zone and prone to removing from vadose media by rain flushing, Pb2+ showed a reverse trend compared with Cr2O72-.
陈子方, 赵勇胜, 孙家强, 白静, 刘璐, 周睿. 铅和铬污染包气带及再释放规律的实验研究[J]. 中国环境科学, 2014, 34(9): 2211-2216.
CHEN Zi-Fang, ZHAO Yong-Sheng, SUN Jia-Qiang, BAI Jing, LIU Lu, ZHOU Rui. Study on the migration and release of lead and chromium and in the vadose zone. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(9): 2211-2216.
