Evaluation of Total Mercury in Sediments of the Descoberto River Environmental Protection Area—Brazil
Evaluation of Total Mercury in Sediments of the Descoberto River Environmental Protection Area—Brazil
复制标题
DOI：
10.3390/ijerph17010154
复制
发表时间：
2019-12
影响因子：
--
通讯作者：
Joelma Ferreira Portela;João Pedro Rudrigues de Souza;Myller de Sousa Tonhá;José Vicente Elias Bernardi;J. Garnier;Jurandir Rodrigues SouzaDe
中科院分区：
文献类型：
--
作者：
Joelma Ferreira Portela;João Pedro Rudrigues de Souza;Myller de Sousa Tonhá;José Vicente Elias Bernardi;J. Garnier;Jurandir Rodrigues SouzaDe
为了评估Descoberto河流域环境保护区(DREPA)的总汞蓄积量(THG)，从Descoberto水库(狭长环境)采集了9个沉积物和水样，并在其支流(LOTIC环境)采集了23个样品，这些样品位于巴西Descoberto河分水岭内的城市化密集区。测定了水体的以下物理化学参数：溶解氧(DO)、氢势(PH)、总溶解固体(TDS)、硝酸盐(NO3-−)、氯化物(Cl2-−)、温度(T)、硫酸盐(SO42-−)，以及沉积物中总汞(THG)和挥发性物质(Vm)的浓度。沉积物中三汞含量在支流(0.03ug−1±0.02)和水库(0.08ug−1±0.04)之间存在显著差异(p=0.002)，表明沉积物是在狭长环境中积累的。对生态毒理风险进行评估的大多数结果的值都低于该浓度，在该浓度下很少观察到不良影响，ERL(影响范围较低)。然而，与用于识别人为贡献的浓缩因子(EF)相比，结果表明，大多数样品都是由车辆交通和农业造成的大气沉降造成的中度污染。这些结果表明，Lentium环境中甲基化的可能性高于Ltic环境中的甲基化。
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 (NO3−); chloride (Cl−); temperature (T); sulfate (SO42−), and in sediment, the concentration of total mercury (THg) and volatile material (VM) was determined. THg concentrations in sediments showed a significant difference (p = 0.002) between tributaries (0.03 µg g−1 ± 0.02) and reservoir (0.08 µg g−1 ± 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.