School of Natural Science, Hampshire College, Amherst, MA 01002, USA.
School of Natural Science, Hampshire College, Amherst, MA 01002, USA.
Environ Pollut. 2014 Dec;195:148-56. doi: 10.1016/j.envpol.2014.08.017. Epub 2014 Sep 16.
Rice is a staple food and major source of nutrients, but it also bioaccumulates toxic elements. In this study, laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) was used to determine tissue-level trace metal spatial distribution in rice (Oryza sativa) seeds from the active Xikuangshan Sb mine area in China. Whole grain quantified elemental bioimages showed the highest concentration of Zn (1755 mg/kg) in the embryo andmicro zones of elevated Sb, As, Pb, Cd as high as 280, 57, 31 and 830 mg/kg, respectively on the husk/bran/endosperm tissues. Bioimages suggest that both Sb and Cd may be competing with Zn for binding sites. Both Sb(III) and Sb(V) species were detected in seeds from upstream and downstream fields indicating the presence of toxic Sb(III). Brown rice is a good source of Zn, but white rice is a safer option if rice is grown in a polluted area.
大米是主食和主要营养来源，但它也会生物累积有毒元素。本研究采用激光烧蚀电感耦合等离子体质谱（LA-ICP-MS）技术，对来自中国锡矿山 Sb 矿区的水稻（Oryza sativa）种子进行组织水平痕量金属空间分布的测定。全谷物定量元素生物图像显示，胚和微区 Sb、As、Pb、Cd 浓度最高，分别为 1755、57、31 和 830mg/kg，在壳/糠/胚乳组织中。生物图像表明 Sb 和 Cd 可能与 Zn 竞争结合位点。上游和下游田块水稻种子中均检测到 Sb(III)和 Sb(V)，表明有毒 Sb(III)的存在。糙米是 Zn 的良好来源，但如果在污染地区种植水稻，白米则是更安全的选择。
