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首页> 外文期刊>Environmental Science & Technology >Field-Scale Heterogeneity and Geochemical Regulation of Arsenic, Iron, Lead, and Sulfur Bioavailability in Paddy Soil
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Field-Scale Heterogeneity and Geochemical Regulation of Arsenic, Iron, Lead, and Sulfur Bioavailability in Paddy Soil

机译：稻田中砷，铁，铅和硫的生物利用度的田间尺度异质性和地球化学调控

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摘要

A method using miniaturized arrayed DGT-probes (PADDI) for high-frequency in situ sampling with LA-ICPMS and CID analysis was developed to measure the field-scale heterogeneity of trace-element bioavailability. Robust calibrations (R-2 0.99) combined with high-sensitivity (LOD = 0.35 ng cm(-2)), multielemental detection, and short measurement times were achieved using a new LA-ICPMS microDGT analysis. In the studied paddy-site (size: similar to 2500 m(2)), total element concentrations across the field were approximately uniform (R.S.D. 10%), but bioavailability was shown to vary significantly as determined from 864 microgel measurements housed within 72 PADDI arrays. Porewater As measurements were unable to differentiate the top/rhizosphere and bulk/deepersoil layers. However, dynamic sampling with DGT revealed significant differences. Heterogeneity behaviors varied greatly between the different elements. Arsenic bioavailability was stable laterally across the field, but varied with depth, which was in contrast to the trends for Pb. Fe/S(-II) change was bidirectional, differing horizontally and vertically throughout the field. The heterogeneity in Pb bioavailability, due to the high frequency of hotspot maxima that were discretely dispersed across the paddy, proved the most difficult to simulate requiring the greatest number of probe deployments to determine a reliable field-average. The DGT-PADDI system provides a new characterization of infield trends for improved trace-inorganics' management in agricultural wetlands.
机译：开发了一种使用小型阵列DGT探针（PADDI）进行LA-ICPMS和CID分析进行高频原位采样的方法，以测量痕量元素生物利用度的现场规模异质性。使用新的LA-ICPMS microDGT分析，可实现高灵敏度（LOD = 0.35 ng cm（-2）），多元素检测和短测量时间的强大校准（R-2> 0.99）。在所研究的稻田中（大小：类似于2500 m（2）），整个田间的总元素浓度大致均匀（RSD <10％），但根据72个实验室中的864微凝胶测量结果，生物利用度显示出显着变化PADDI阵列。孔隙水As的测量无法区分顶部/根际和散装/深层土壤。但是，使用DGT进行动态采样显示出显着差异。不同元素之间的异质性行为差异很大。砷的生物利用度在整个田间横向稳定，但随深度而变化，这与铅的趋势相反。 Fe / S（-II）的变化是双向的，整个场的水平和垂直方向都不同。 Pb生物利用度的异质性，是由于最大热点的高频率离散分布在整个稻田中，被证明是最难模拟的，需要最多数量的探针部署才能确定可靠的场均值。 DGT-PADDI系统提供了内场趋势的新特征，可以改善农业湿地中痕量无机物的管理。

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  • 来源
    《Environmental Science & Technology》 |2018年第21期|12098-12107|共10页
  • 作者

    Fang Wen; Williams Paul N.; Fang Xu; Amoah-Antwi Collins; Yin Daixia; Li Gang; Ma Lena Q.; Luo Jun;

  • 作者单位

    Chinese Acad Sci, Inst Urban Environm, Key Lab Urban Environm & Hlth, Xiamen 361021, Fujian, Peoples R China;

    Queens Univ Belfast, Inst Global Food Secur, David Keir Bldg,Malone Rd, Belfast BT9 5BN, Antrim, North Ireland;

    Swiss Fed Inst Technol, Dept Environm Syst Sci, Inst Biogeochem & Pollutant Dynam, CH-8092 Zurich, Switzerland;

    Warsaw Univ Technol, Plac Politech 1, PL-00661 Warsaw, Poland;

    Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210023, Jiangsu, Peoples R China;

  • 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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