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首页> 美国卫生研究院文献>International Journal of Environmental Research and Public Health >Evaluation of Total Mercury in Sediments of the Descoberto River Environmental Protection Area—Brazil
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Evaluation of Total Mercury in Sediments of the Descoberto River Environmental Protection Area—Brazil

机译：巴西Descoberto河环境保护区沉积物中的总汞评估

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To evaluate the total mercury accumulation (THg) in the Descoberto river basin environmental protection area (DREPA), nine sediment and water samples were collected from the Descoberto reservoir (lentic environment), and 23 in its tributaries (lotic environment), which are located in a densely urbanized area within the Descoberto river watershed, Brazil. The following physicochemical parameters of water were determined: dissolved oxygen (DO); hydrogen potential (pH); total dissolved solids (TDS); nitrate (NO ); chloride (Cl ); temperature (T); sulfate (SO ), and in sediment, the concentration of total mercury (THg) and volatile material (VM) was determined. THg concentrations in sediments showed a significant difference ( = 0.002) between tributaries (0.03 µg g ± 0.02) and reservoir (0.08 µg g ± 0.04), indicating accumulation in the lentic environment. Most of the results evaluated for ecotoxicological risks presented values below the concentration, at which adverse effects would rarely be observed, ERL (effects range low). However, in relation to the enrichment factor (EF), applied to identify the anthropogenic contribution, the results indicate that most of the samples are moderately polluted through atmospheric deposition due to vehicular traffic and agriculture. These results show that the likelihood of methylation in the lentic environment is higher than in the lotic environment.
机译：为了评估Descoberto流域环境保护区（DREPA）中的总汞累积（THg），从Descoberto水库（透镜状环境）中收集了9个沉积物和水样，在其支流（船坞环境）中收集了23个支流巴西Descoberto河流域内一个人口稠密的城市化地区。确定了以下水的物理化学参数：溶解氧（DO）；氢势（pH）;总溶解固体（TDS）；硝酸盐（NO）;氯化物（Cl）;温度（T）;硫酸盐（SO）和沉积物中的总汞（THg）和挥发性物质（VM）的浓度。支流（0.03 µg g±0.02）和储层（0.08 µg g±0.04）之间的沉积物中THg浓度显示出显着差异（= 0.002），表明在透镜体环境中积累。对生态毒理风险进行评估的大多数结果显示的值低于该浓度，该浓度很少观察到不利影响，即ERL（影响范围低）。但是，关于用于确定人为贡献的富集因子（EF），结果表明，由于车辆交通和农业，大多数样品由于大气沉积而受到中等污染。这些结果表明，在晶状体环境中甲基化的可能性高于在乳液环境中。

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