Discipline of Microbiology, School of Biochemistry, Genetics, Microbiology and Plant Pathology, Faculty of Science and Agriculture, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban 4000, Republic of South Africa.
J Environ Sci (China). 2009;21(5):661-6. doi: 10.1016/s1001-0742(08)62322-0.
1,2-Dichloroethane (DCA), a potential mutagen and carcinogen, is commonly introduced into the environment through its industrial and agricultural use. In this study, the impact of lead and mercury on DCA degradation in soil was investigated, owing to the complex co-contamination problem frequently encountered in most sites. 1,2-Dichloroethane was degraded readily in both contaminated loam and clay soils with the degradation rate constants ranging between 0.370-0.536 week(-1) and 0.309-0.417 week(-1), respectively. The presence of heavy metals have a negative impact on DCA degradation in both soil types, resulting in up to 24.11% reduction in DCA degradation within one week. Both biostimulation and treatment additives increased DCA degradation, with the best degradation observed upon addition of glucose and a combination of diphosphate salt and sodium chloride, leading to about 17.91% and 43.50% increase in DCA degradation, respectively. The results have promising potential for effective remediation of soils co-contaminated with chlorinated organics and heavy metals. However, the best bioremediation strategy will depend on the soil types, microbial population present in the soil matrices, nutrients availability and metal forms.
1,2-二氯乙烷（DCA）是一种潜在的诱变剂和致癌物，由于在大多数地点经常遇到复杂的共同污染问题，因此其通过工业和农业用途而被引入环境。在这项研究中，研究了铅和汞对土壤中 DCA 降解的影响，因为在大多数地点经常遇到复杂的共同污染问题。1,2-二氯乙烷在受污染的壤土和粘土地中均易于降解，其降解速率常数分别在 0.370-0.536 周（-1）和 0.309-0.417 周（-1）之间。重金属的存在对两种土壤类型中的 DCA 降解均有负面影响，导致 DCA 降解在一周内减少了高达 24.11%。生物刺激和处理添加剂均可增加 DCA 的降解，其中在添加葡萄糖和磷酸二氢盐与氯化钠的混合物时，DCA 的降解率最高，分别增加了约 17.91%和 43.50%。这些结果为有效修复同时受到含氯有机物和重金属污染的土壤提供了有希望的潜力。然而，最佳的生物修复策略将取决于土壤类型、土壤基质中存在的微生物种群、养分的可用性和金属的形态。
