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首页> 外文期刊>Environmental Science & Technology >Effects of Water Management on Cadmium and Arsenic Accumulation and Dimethylarsinic Acid Concentrations in Japanese Rice
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Effects of Water Management on Cadmium and Arsenic Accumulation and Dimethylarsinic Acid Concentrations in Japanese Rice

机译：水分管理对日本大米中镉和砷积累及二甲基砷酸浓度的影响

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摘要

Rice consumption is a major source of cadmium and arsenic for the population of Asia. We investigated the effects of water management in rice paddy on levels of cadmium and arsenic in Japanese rice grains. Flooding increased arsenic concentrations in rice grains, whereas aerobic treatment increased the concentration of cadmium. Flooding for 3 weeks before and after heading was most effective in reducing grain cadmium concentrations, but this treatment increased the arsenic concentration considerably, whereas aerobic treatment during the same period was effective in reducing arsenic concentrations but increased the cadmium concentration markedly. Flooding treatment after heading was found to be more effective than flooding treatment before heading in reducing rice grain cadmium without a concomitant increase in total arsenic levels, although it increased inorganic arsenic levels. Concentrations of dimethylarsinic acid (DMA) in grain were very low under aerobic conditions but increased under flooded conditions. DMA accounted for 3-52% of the total arsenic concentration in grain grown in soil with a lower arsenic concentration and 10-80% in soil with a higher arsenic concentration. A possible explanation for the accumulation of DMA in rice grains is that DMA translocates from shoots/roots to the grains more readily than does inorganic arsenic.
机译：大米的消费是亚洲人口中镉和砷的主要来源。我们调查了稻田水分管理对日本稻米中镉和砷水平的影响。洪水增加了稻米中的砷含量，而好氧处理则增加了镉含量。抽穗前后3周淹水最有效地降低了谷物中的镉浓度，但是这种处理显着提高了砷的浓度，而有氧处理在同一时期有效地降低了砷的浓度，但显着提高了镉的浓度。发现抽穗后的淹水处理比抽穗前的淹水处理在减少水稻籽粒镉方面更有效，尽管总砷含量增加，但总砷含量却没有增加。在有氧条件下，谷物中二甲基砷酸（DMA）的浓度非常低，但在淹水条件下会增加。在砷浓度较低的土壤中，DMA占谷物总砷浓度的3-52％，在砷浓度较高的土壤中，DMA占总砷浓度的10-80％。稻米中DMA积累的一个可能的解释是，与无机砷相比，DMA从芽/根到谷粒的转运更容易。

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  • 来源
    《Environmental Science & Technology》 |2009年第24期|9361-9367|共7页
  • 作者

    TOMOHITO ARAO; AKIRA KAWASAKI; KOJI BABA; SHINSUKE MORI; SHINSUKE MORI;

  • 作者单位

    National Institute for Agro-Environmental Sciences, Kannondai 3-1-3, Tsukuba, Ibaraki, 305-8604, Japan;

    National Institute for Agro-Environmental Sciences, Kannondai 3-1-3, Tsukuba, Ibaraki, 305-8604, Japan;

    National Institute for Agro-Environmental Sciences, Kannondai 3-1-3, Tsukuba, Ibaraki, 305-8604, Japan;

    National Institute for Agro-Environmental Sciences, Kannondai 3-1-3, Tsukuba, Ibaraki, 305-8604, Japan;

    Shimane University, Faculty of Life and Environmental Science, 2059 Kamihonjomachi, Matsue, Shimane, 690-1102, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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