Corn (Zea mays L.): A low methylmercury staple cereal source and an important biospheric sink of atmospheric mercury, and health risk assessment
Corn (Zea mays L.): A low methylmercury staple cereal source and an important biospheric sink of atmospheric mercury, and health risk assessment
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玉米（Zea mays L.）：低甲基汞主粮来源和重要的大气汞生物圈汇以及健康风险评估
DOI：
10.1016/j.envint.2019.104971
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发表时间：
2019
影响因子：
11.8
通讯作者：
Zhang Hua
中科院分区：
文献类型：
--
作者：
Sun Guangyi;Feng Xinbin;Yin Runsheng;Zhao Huifang;Zhang Leiming;Sommar Jonas;Li Zhonggen;Zhang Hua
在亚洲汞（汞）污染地区，人类通过以当地生产的作物为基础的大米饮食接触有毒的甲基汞（MeHg），可能对健康构成威胁。在这些地区，水稻的替代种植制度是最可取的。在本研究中，玉米是世界上生物量最大的谷物来源，与水稻相比，玉米可食用部分从土壤中积累的甲基汞量微不足道，这表明玉米是一种非常有竞争力的替代作物。通过对汞稳定同位素组成的检测，发现玉米地上部分的汞主要来自大气。据估计，世界范围内的玉米种植是大气汞的一个不可降解的汇，每年每个生长季节累积约44 毫克汞，其中大部分来自叶片对大气汞的吸收，这一数量与在北美和欧洲观测到的凋落物汞相当。因此，建议在高汞污染地区用玉米代替大米来修复食品供应中的汞污染。
In mercury (Hg) contaminated areas of Asia, human exposure to toxic methyl-Hg (MeHg) through a rice-based diet of locally produced crop may pose a health threat. Alternative cropping system to rice in such areas would be most desirable. In this study, corn, the leading cereal source in the world with large biomass, was demonstrated to accumulate an insignificant amount of MeHg from the soil in its edible portion compared to that in rice, suggesting corn being a very competitive alternative crop. By examining Hg stable isotope composition, Hg in the aerial parts of corn was found to be mostly from the atmosphere. Maize cropping worldwide is estimated to be a discemible sink of atmospheric Hg with approximately 44 Mg Hg accumulated in each growing season on a yearly basis, most of which is from foliar uptake of atmospheric Hg and this amount is comparable to litterfall Hg observed in North America and Europe. It is thus recommended to use corn as a replacement of rice in highly Hg-contaminated areas for remediation of Hg pollution in the food supply.