Department of Environmental Science , Baylor University , One Bear Place #97266 , Waco , Texas 76798-7266 , United States.
Oak Ridge Institute for Science and Education (ORISE) , Oak Ridge , Tennessee 37831-0117 , United States.
Environ Sci Technol. 2019 May 7;53(9):4988-4996. doi: 10.1021/acs.est.9b00234. Epub 2019 Apr 15.
A 6 × 2 factorial study was conducted to investigate the effects of copper oxide nanoparticles (nCuO, 0-100 mg/L), arsenic (As, 0-10 mg/kg), and their interaction on uptake, distribution, and speciation of Cu and As in rice plants ( Oryza sativa japonica 'Koshihikari'). Arsenic (in As-addition treatments) and Cu in seedling roots (SRs) were 1.45 and 1.58 times those in soil, respectively. Arsenic and Cu concentrations further increased in mature plant roots (MRs), which were 2.06 and 2.35 times those in soil, respectively. Arsenic and Cu concentrations in seedling shoots (SSs) were 79% and 54% lower than those in SRs, respectively. The mature stems, however, contained only 3% and 44% of As and Cu in SSs. Copper in flag leaves did not vary much compared to that in stems, whereas As was 14.5 times that in stems. Species transformations of Cu and As were observed in rice including reductions of Cu(II) to Cu(I) and As(V) to As(III). Arsenic in dehusked grains was negatively correlated with Cu and was lowered by nCuO below the WHO (World Health Organization) maximum safe concentration for white rice (200 ng/g). This may alleviate As adverse effects on humans from rice consumption.
进行了一项 6×2 的析因研究，以调查氧化铜纳米颗粒（nCuO，0-100mg/L）、砷（As，0-10mg/kg）及其相互作用对水稻（粳稻‘Koshihikari’）植株中 Cu 和 As 的吸收、分布和形态的影响。砷（在添加砷的处理中）和 Cu 在幼苗根部（SRs）中的浓度分别是土壤中的 1.45 和 1.58 倍。砷和 Cu 浓度在成熟植物根部（MRs）中进一步增加，分别是土壤中的 2.06 和 2.35 倍。砷和 Cu 在幼苗地上部分（SSs）中的浓度分别比 SRs 低 79%和 54%。然而，成熟茎中只含有 SSs 中 As 和 Cu 的 3%和 44%。与茎相比，旗叶中的 Cu 变化不大，而 As 则是茎的 14.5 倍。在水稻中观察到 Cu 和 As 的物种转化，包括 Cu(II)还原为 Cu(I)和 As(V)还原为 As(III)。糙米中脱壳谷物的砷与 Cu 呈负相关，且 nCuO 将其降低至世界卫生组织（WHO）对白米（200ng/g）的最大安全浓度以下。这可能减轻了从食用大米中摄取 As 对人体的不良影响。
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