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首页> 外文期刊>Environmental Science & Technology >In Situ Fixation of Metal(Ioid)s in Contaminated Soils: A Comparison of Conventional, Opportunistic, and Engineered Soil Amendments
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In Situ Fixation of Metal(Ioid)s in Contaminated Soils: A Comparison of Conventional, Opportunistic, and Engineered Soil Amendments

机译：原位固定在污染土壤中的金属（Ioid）：传统，机会主义和工程土壤改良剂的比较

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摘要

This study aimed to assess and compare the in vitro and in vivo bioaccessibility/bioavallability of As and Pb in a mining contaminated soil (As, 2267 mg kg~(-1); Pb, 1126 mg kg~(-1)), after the addition of conventional (phosphoric add), opportunistic [water treatment residues (WTRs)], and engineered [nano- and microscale zero valent iron (ZVI)] amendments. Phosphoric add was the only amendment that could significantly decrease Pb bioaccessibility with respect to untreated nil (41 and 47% in me gastric phase and 2.1 and 8.1% in the intestinal phases, respectively), givmg treatment effect ratios (TERs, the bioaccessibility in the amended soil divided by the bioaccessibility in the untreated soil) of 0.25 and 0.87 in the gastric and intestinal phase, respectively. The in vivo bioavailability of Pb decreased in the phosphate treatment relative to the untreated soil (6 and 24%, respectively), and also in the Fe WTR 2% (12%) and nZVI-2 (13%) treatments. The ZVI amendments caused a decrease in As bioaccessibility, with the greatest decrease In the nZVI2-treated soli (TERs of 0.59 and 0.64 in the gastric and intestinal phases, respectively). Arsenic X-ray absorption near-edge spectroscopy analysis indicated that most of the As in the untreated soil was present as As(Ⅴ) associated with Fe mineral phases, whereas in the treated soil, the proportion of arsenosiderite increased. Arsenite was present only as a minor species (3-5%) in the treated soils, with the exception of an nZVI treatment [～14% of As(Ⅲ)], suggesting a partial reduction of As(Ⅴ) to As(Ⅲ) caused by nZVI oxidation.
机译：本研究旨在评估和比较采矿后污染土壤（As，2267 mg kg〜（-1）; Pb，1126 mg kg〜（-1））中As和Pb的体内外生物利用度/生物利用度。常规的添加（磷添加），机会性的[水处理残留物（WTR）]和工程化的[纳米和微米级零价铁（ZVI）]修正。磷添加是唯一可以显着降低未经处理的零铅（胃阶段分别为41％和47％，肠阶段分别为2.1％和8.1％），给定的治疗效果比（TERs，在肠道中的生物利用度）的Pb生物利用度。修改后的土壤除以未经处理的土壤中的生物可及性）在胃和肠阶段分别为0.25和0.87。相对于未处理的土壤（分别为6％和24％），在磷酸盐处理中，以及在2％的Fe WTR（12％）和nZVI-2（13％）处理中，Pb的体内生物利用度均降低。 ZVI修订案导致As生物可及性下降，其中nZVI2处理的大豆中As的生物利用度下降幅度最大（胃和肠阶段的TERs分别为0.59和0.64）。砷X射线吸收近缘光谱分析表明，未经处理的土壤中的大多数砷以与铁矿相相关的砷（Ⅴ）的形式存在，而在经过处理的土壤中，砷铁矿的比例增加。除nZVI处理外[〜14％As（Ⅲ）]，砷在处理过的土壤中仅以次要形式存在（3-5％），表明As（Ⅴ）部分还原为As（Ⅲ） ）由nZVI氧化引起。

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  • 来源
    《Environmental Science & Technology》 |2015年第22期|13501-13509|共9页
  • 作者

    Elena Mele; Erica Dormer; Albert L. Juhasz; Gianluca Brunetti; Euan Smith; Aaron R. Betts; Paola Castaldi; Salvatore Deiana; Kirk G. Scheckel; Enzo Lombi;

  • 作者单位

    Dipartimento di Agraria, Sezione di Scienze e Tecnologie Ambientali e Alimentari, University of Sassari, Viale Italia 39,07100 Sassari, Italy;

    Centre for Environmental Risk Assessment and Remediation, University of South Australia, Building X, Mawson Lakes Campus, Adelaide, South Australia 5095, Australia ,Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), P.O. Box 486, Salisbury, South Australia S106, Australia;

    Centre for Environmental Risk Assessment and Remediation, University of South Australia, Building X, Mawson Lakes Campus, Adelaide, South Australia 5095, Australia ,Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), P.O. Box 486, Salisbury, South Australia S106, Australia;

    Centre for Environmental Risk Assessment and Remediation, University of South Australia, Building X, Mawson Lakes Campus, Adelaide, South Australia 5095, Australia ,Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), P.O. Box 486, Salisbury, South Australia S106, Australia;

    Centre for Environmental Risk Assessment and Remediation, University of South Australia, Building X, Mawson Lakes Campus, Adelaide, South Australia 5095, Australia ,Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), P.O. Box 486, Salisbury, South Australia S106, Australia;

    Office of Research and Development, National Risk Management Research Laboratory, United States Environmental Protection Agency, 26 West Martin Luther King Drive, Cincinnati, Ohio 45268, United States ,Oak Ridge Institute for Science and Education, P.O. Box 117, Oak Ridge, Tennessee 37831, United States;

    Dipartimento di Agraria, Sezione di Scienze e Tecnologie Ambientali e Alimentari, University of Sassari, Viale Italia 39,07100 Sassari, Italy;

    Dipartimento di Agraria, Sezione di Scienze e Tecnologie Ambientali e Alimentari, University of Sassari, Viale Italia 39,07100 Sassari, Italy;

    National Risk Management Research Laboratory, United States Environmental Protection Agency, 5995 Centre Hill Avenue, Cincinnati, Ohio 45224, United States;

    Centre for Environmental Risk Assessment and Remediation, University of South Australia, Building X, Mawson Lakes Campus, Adelaide, South Australia 5095, Australia;

  • 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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