Characterization of mercury species in brown and white rice (Oryza sativa L.) grown in water-saving paddies
Characterization of mercury species in brown and white rice (Oryza sativa L.) grown in water-saving paddies
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DOI：
10.1016/j.envpol.2011.01.027
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发表时间：
2011-05-01
影响因子：
8.9
通讯作者：
Yuan, Xiaobo
中科院分区：
文献类型：
--
作者：
Rothenberg, Sarah E.;Feng, Xinbin;Yuan, Xiaobo
在中国，总汞（Hg-T）和甲基汞（甲基汞）进行了量化的水稻生长在三个网站使用节水水稻种植方法，并在一个汞污染的网站，水稻生长在洪水条件下。抛光白色大米中汞-T的浓度（节水：3.3 +/- 1.6纳克/克;淹水：110 +/- 9.2纳克/克）和甲基汞（节水1.3 +/-0.56ng/g;淹水12 +/-2.4ng/g）与根际土壤HgT和MeHg含量呈正相关（HgT：r（2）= 0.97，MeHg：r（2）= 0.87，p < 0.05），表明水稻籽粒中的汞形态有一部分来自土壤，土壤中汞形态向水稻籽粒的迁移与灌溉方式和汞水平无关，但其他因素可能也很重要。HgT和其他微量元素的浓度在未碾磨的糙米中显著较高（p 0.20），表明甲基汞渗入胚乳（即，白色大米）比无机Hg（II）更有效。(C)2011爱思唯尔有限公司保留所有权利。
In China, total Hg (Hg-T) and methylmercury (MeHg) were quantified in rice grain grown in three sites using water-saving rice cultivation methods, and in one Hg-contaminated site, where rice was grown under flooded conditions. Polished white rice concentrations of Hg-T (water-saving: 3.3 +/- 1.6 ng/g; flooded: 110 +/- 9.2 ng/g) and MeHg (water-saving 1.3 +/- 0.56 ng/g; flooded: 12 +/- 2.4 ng/g) were positively correlated with root-soil HgT and MeHg contents (HgT: r(2) = 0.97, MeHg: r(2) = 0.87, p < 0.05 for both), which suggested a portion of Hg species in rice grain was derived from the soil, and translocation of Hg species from soil to rice grain was independent of irrigation practices and Hg levels, although other factors may be important. Concentrations of HgT and other trace elements were significantly higher in unmilled brown rice (p 0.20), indicating MeHg infiltrated the endosperm (i.e., white rice) more efficiently than inorganic Hg(II). (C) 2011 Elsevier Ltd. All rights reserved.