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了解东平湖湖水中汞(Hg)和砷(As)的形态赋存特征及健康风险。方法于2016年5月,在东平湖采集30个表层水样,采用原子荧光光度法对Hg和As的总浓度及其不同形态浓度进行测定,并采用美国国家环保署(US EPA)推荐的健康风险评价模型对其通过饮水途径产生的健康风险进行了评价。结果东平湖湖水中总As浓度为(7.289±0.832)μg/L,总Hg浓度的中位数为0.929(0.063~3.230)μg/L;总As浓度均符合国家Ⅲ类水标准,而总Hg的超标率为96.7%。溶解态Hg浓度占总Hg的平均比例为63.4%,高于颗粒态Hg浓度占总Hg的比例(36.6%)。各采样点溶解态As和颗粒态As占总As比例的平均值分别为53.4%和46.6%,湖区北部采样点溶解态As所占比重较大;溶解态As中致毒性较大的As(Ⅲ)比例较小。As和Hg通过饮水途径产生的健康风险值分别为5.46×10~(-5)/a和1.56×10~(-9)/a,As的健康风险值远高于Hg,且超过最大可接受水平(5×10~(-5)/a)。结论东平湖湖水中Hg浓度超标,As通过饮水途径产生的健康风险值超过最大可接受风险水平,Hg和As应作为东平湖的重点监控因子。
To understand the morphological characteristics and health risks of mercury (Hg) and arsenic (As) in Dongping lake water. Methods In May 2016, 30 surface water samples were collected from Dongping Lake. The total Hg and As concentrations and their concentrations were determined by atomic fluorescence spectrometry. The health of the US EPA recommended The risk assessment model assesses the health risks it generates through drinking water. Results The total As concentration in Dongping lake water was (7.289 ± 0.832) μg / L and the total Hg concentration was 0.929 (0.063 ~ 3.230) μg / L. The total As concentration was in line with the national water standard Ⅲ, The exceeding rate of 96.7%. The average ratio of dissolved Hg to total Hg was 63.4%, which was higher than the proportion of particulate Hg to total Hg (36.6%). The average values of dissolved As and particulate As in each sampling point were 53.4% and 46.6%, respectively, and the proportion of dissolved As in the northern part of the lake was larger. As (Ⅲ ) A small proportion. The health risk values of As and Hg through drinking water were 5.46 × 10 -5 and 1.56 × 10 -9, respectively. The health risk of As was much higher than that of Hg and exceeded the maximum acceptable Horizontal (5 × 10 ~ (-5) / a). Conclusion The concentration of Hg in Dongping lake water exceeds the standard, and the healthy risk value of As produced through drinking water channel exceeds the maximum acceptable risk level. Hg and As should be the key monitoring factors in Dongping Lake.