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加纳 Obuasi 周边选定的手工和小规模采金社区农田土壤和大蕉中汞的人体健康风险评估。

The human health risks assessment of mercury in soils and plantains from farms in selected artisanal and small-scale gold mining communities around Obuasi, Ghana.

机构信息

Graduate School of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, Kumamoto, Japan.

Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, Kumamoto, Japan.

出版信息

J Appl Toxicol. 2022 Feb;42(2):258-273. doi: 10.1002/jat.4209. Epub 2021 Jun 16.

Abstract

Food consumption remains the commonest pathway through which humans ingest higher levels of mercury (Hg). Long-term exposure to Hg through Hg-contaminated food may result in acute or chronic Hg toxicity. Incessant discharge of Hg waste from ASGM facilities into nearby farms contaminates food crops. Ingestion of such food crops by residents may lead to detrimental human health effects. The human health risks upon exposure to total mercury (THg) and methylmercury (MeHg) in farmland soils and plantains from farms sited near ASGM facilities were studied in four communities around Obuasi, Ghana. The human health risk assessment was evaluated using hazard quotient (HQ), estimated average daily intake ( AvDI), hazard index (HI) and Hg elimination and retention kinetics. Tweapease, Nyamebekyere and Ahansonyewodea had HQ, AvDI and HI for THg of plantains for both adults and children below the recommended USEPA limit of 1, 3 × 10  mg/kg/day and 1, respectively. Odumase had HQ, AvDI and HI for THg of plantains for both adults and children, higher than the guideline values. This meant that only Odumase may cause non-carcinogenic human health effects upon repeated exposure. The HQ, AvDI and HI values of MeHg for all the study areas were far below guideline values, hence may not pose any non-carcinogenic human health risks to residents even upon repeated exposure. Retention and elimination kinetics of Hg also showed that only plantains from Odumase may pose significant non-carcinogenic human health risks to residents because the final amount of inorganic mercury exceeded the extrapolated USEPA guideline value of 0.393 μg/kg/year.

摘要

人类摄入高浓度汞(Hg)的主要途径仍是食物。长期食用受汞污染的食物会导致急性或慢性汞中毒。手工金矿开采(ASGM)设施排放的汞废物不断进入附近农田,污染了粮食作物。居民食用这些粮食作物可能会对健康造成不良影响。本研究调查了加纳 Obuasi 周围四个社区中,来自 ASGM 设施附近农田土壤和大蕉中的总汞(THg)和甲基汞(MeHg)对居民的健康风险。采用危害商数(HQ)、平均日摄入量( AvDI)、危害指数(HI)以及汞消除和保留动力学来评估人类健康风险。Tweapease、Nyamebekyere 和 Ahansonyewodea 社区的成人和儿童食用大蕉的 THg 的 HQ、 AvDI 和 HI 均低于美国环保署推荐的 1,3×10 毫克/公斤/天和 1 的限量。Odumase 社区的成人和儿童食用大蕉的 THg 的 HQ、 AvDI 和 HI 均高于指导值,这意味着只有 Odumase 可能会对反复暴露产生非致癌的人类健康影响。所有研究区域的 MeHg 的 HQ、 AvDI 和 HI 值均远低于指导值,因此即使反复暴露,也不会对居民造成任何非致癌的人类健康风险。汞的保留和消除动力学也表明,只有 Odumase 的大蕉可能对居民造成显著的非致癌性人类健康风险,因为最终无机汞的含量超过了美国环保署 0.393μg/kg/年的指导值。

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