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首页> 外文期刊>Science of the total environment >Seasonal variations in arsenic mobility and bacterial diversity: The case study of Huangshui Creek, Shimen Realgar Mine, Hunan Province, China
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Seasonal variations in arsenic mobility and bacterial diversity: The case study of Huangshui Creek, Shimen Realgar Mine, Hunan Province, China

机译：砷迁移率和细菌多样性的季节变异：湖南省湖南省石门羊毛矿的案例研究

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Rivers throughout the world have been contaminated by arsenic dispersed from mining activities. The biogeo-chemical cycling of this arsenic has been shown to be due to factors such as pH, Eh, ionic strength and microbial activity, but few studies have examined the effects of both seasonal changes and microbial community structure on arsenic speciation and flux in mining-affected river systems. To address this research gap, a study was carried out in Huangshui Creek, Hunan province, China, which has been severely impacted by long-term historic realgar (α-As_4S_4) mining. Water and sediment sampling, and batch experiments at different temperatures using creek sediment, were used to determine the form, source and mobility of arsenic. Pentavalent (AsO~3_4) and trivalent arsenic (AsO~(3-)_3) were the dominant aqueous species (70-89% and 30-11%, respectively) in the creek, and the maximum concentration of inorganic arsenic in surface water was 10,400 μg/L, Dry season aqueous arsenic concentrations were lower than those in the wet season samples. The sediments contained both arsenate and ar-senite, and relative proportions of these varied with season. 8.3 tons arsenic per annum were estimated to be exported from Huangshui Creek. Arsenic release from sediment increased by 3 to 5 times in high water temperature batch experiments (25 and 37 °C) compared to those carried out at low temperature (8 °C). Our data suggest that the arsenic-containing sediments were the main source of arsenic contamination in Huangshui Creek. Microbial community structured varied at the different sample sites along the creek. Redundancy analysis (RDA) showed that both temperature and arsenic concentrations were the main controlling factors on the structure of the microbial community. Protecbacteria, Bacteroidetes, Cyanobacteria, Firmicutes, Verrucomicrobia, and Planctomycetes were the stable dominant phyla in both dry and wet seasons. The genera Flavobacterium. Hydrogenophaga and Sphingomonas occurred in the most highly arsenic contaminated sites, which removed arsenic by related metabolism.Our findings indicate that seasonal variations profoundly control arsenic flux and species, microbial community structure and ultimately, the biogeochemical fate of arsenic.
机译：整个世界的河流被污染来自采矿活动的砷被污染。这种砷的生物盖 - 化学循环已被证明是由于pH，eh，离子强度和微生物活性等因素，但是少数研究检测了季节性变化和微生物群落结构对砷形态和挖掘通量的影响 - 被发现的河流系统。为了解决这一研究差距，在中国湖南省黄水溪进行了一项研究，这受到长期历史衣物（α-AS_4S_4）采矿的严重影响。使用河沉积物的不同温度的水和沉积物采样，以及分批实验，用于确定砷的形式，源和迁移率。五价砷（ASO〜3_4）和三价砷（ASO〜（3 - ）_ 3）是小溪中的主要含水物质（分别为70-89％和30-11％），以及地表水中无机砷的最大浓度是10,400μg/ L，干季含水砷浓度低于湿季样品中的水溶液。沉积物含有砷酸盐和ar-senite，这些季节的相对比例随季节而变化。每年8.3吨砷砷估计从黄水溪出口。与在低温（8℃）下进行的那些相比，从沉淀物中的砷释放在高水温批量实验（25和37℃）中增加了3至5倍。我们的数据表明，含砷的沉积物是黄水溪砷污染的主要来源。微生物群落结构沿着小溪的不同样品位点变化。冗余分析（RDA）表明，温度和砷浓度均为微生物群落结构的主要控制因素。 ProtecBacteria，Bragerodetes，Cyanobacteria，Froumicutes，VerrucoMicrobia和Planctomycetes是干燥和潮湿的季节中稳定的优势植物。属味精。发生氢气和鞘磷脂发生在最高度砷的污染场地，其通过相关的代谢除去砷。调查结果表明，季节性变异深刻地控制砷通量和物种，微生物群落结构，并最终，砷的生物地核算命运。

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