桂东南某河流铊污染后人群铊暴露状况初步调查

目的 了解桂东南某河流铊污染3年后沿岸某村井水、土壤、地产食用农产品以及居民重金属铊含量水平,评估当地居民健康风险.方法 于2016年,选择2013年发生铊污染事件的某河流沿岸某村作为污染区,选择该河流污染段上游沿岸的1个自然村作为对照区.采集井水、土壤、地产食用农产品及(18-75)岁常住居民尿液样品,采用电感耦合等...

Preliminary investigation on residents'thallium exposure after thallium pollution in a river in southeast Guangxi Zhuang Autonomous Region,China

Objective To investigate thallium levels in well water,soil,and food products from land,as well as residents of a village along a river of thallium pollution in southeast Guangxi Zhuang Autonomous Region,China after thallium pollution three years later,and to evaluate the health risk of local residents.Methods In 2016,a village along a river where a thallium pollution event had occurred in 2013 were selected as the polluted area,and a natural village along the upstream of the polluted river section were selected as the control area.Well water samples,soil samples,land-produced food samples,and urine samples from local residents aged between 18 and 75 years were collected to measure thallium levels by ICP-MS.Results Compared with the control area,the polluted area had a significantly higher thallium level in well water(median:not detected vs 0.290μg/L,z=-6.51,P<0.01),a significantly lower qualified rate of thallium in well water(100.0%vs 24.6%,χ²=42.48,P<0.01),a significantly higher thallium level in soil(median:0.595 vs 0.755 mg/kg,z=-2.02,P<0.05),and a significantly higher thallium level in food(median:0.250 vs 1.861μg/kg,z=-4.14,P<0.01).There was no significant difference in urinary thallium content among residents in the polluted area and those in the control area(geometric mean:0.70 vs 0.67μg/g creatinine,F=1.18,P>0.05).Conclusion Residents in the polluted area are exposed to thallium to a certain extent,but their urinary thallium level is similar to that of residents in the control area.