检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
机构地区:[1]中国地质科学院岩溶地质研究所、国土资源部岩溶动力学重点实验室,广西桂林541004 [2]中国地质大学环境学院、生物地质与环境地质国家重点实验室,湖北武汉430074
出 处:《环境科学与技术》2014年第6期44-48,共5页Environmental Science & Technology
基 金:国家杰出青年科学基金项目(40425001);国家自然科学基金重点项目(40830748)
摘 要:为查明土著微生物在氮气和甲烷2种厌氧环境中对沉积物中砷释放的影响,采用河套平原高砷含水沉积物中分离纯化的一株耐砷细菌YH001进行了微宇宙实验。实验结果表明:在氮气环境中,pH值最低降到7.0,溶液中铁的质量浓度不断增加,并在第14天达到最大值8.17 mg/L,砷的质量浓度最高达到64μg/L。在甲烷环境中,pH值最低降到7.5,溶液中铁的质量浓度呈下降趋势,砷的质量浓度最高达到84.8μg/L。在不同的厌氧环境中,砷的释放趋势一致,但控制砷的释放过程有所不同。在氮气环境中,微生物将铁氧化物还原的同时能将砷释放出来。在甲烷环境中,未发现铁从沉积物中释放出来。To investigate the effect of indigenous bacteria activity on the release of arsenic from sediment in CH4 and N2 atmosphere, microcosm experiments were conducted with an indigenous bacteria strain named YH001, which was isolated from high arsenic aquifer sediment of the Hetao Plain. Experiment results showed that the pH of suspension reduced to 7.0, Fe concentratio.n of supernatant increased rapidly and reached the maximum value of 8.17 mg/L and As concentration increased to 64 μg/L on the 14^TH day under N2 atmosphere. However, in CH4 atmosphere, the pH of supernatant reduced to 7. 5 and As concentration increased to 84.8 μg/L, while Fe concentration decreased gradually in the first 14 days. Both experiments indicated that microbial activities can significant mobilize arsenic under different anaerobic conditions, while the process controlling the arsenic mobilization may be different. Indigenous bacteria-mediated reduction of Fe oxides would greatly contribute to As mobilization in aquifer sediments, while there is no evidence of iron mobilization in CH4 atmosphere in the experiments.
分 类 号:X142[环境科学与工程—环境科学]
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.249