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Arsenic Speciation and Extraction and the Significance of Biodegradable Acid on Arsenic Removal—An Approach for Remediation of Arsenic-Contaminated Soil

Author

Listed:
  • Thinh Nguyen Van

    (Graduate School of Integrated Sciences for Global Society, Kyushu University, Fukuoka 819-0395, Japan)

  • Yasuhito Osanai

    (Graduate School of Integrated Sciences for Global Society, Kyushu University, Fukuoka 819-0395, Japan)

  • Hai Do Nguyen

    (Soil Science Department, Faculty of Land Management, Vietnam National University of Agriculture, Hanoi 100-000, Vietnam)

  • Kiyoshi Kurosawa

    (Institute of Tropical Agriculture, Kyushu University, Fukuoka 812-8581, Japan)

Abstract

A series of arsenic remediation tests were conducted using a washing method with biodegradable organic acids, including oxalic, citric and ascorbic acids. Approximately 80% of the arsenic in one sample was removed under the effect of the ascorbic and oxalic acid combination, which was roughly twice higher than the effectiveness of the ascorbic and citric acid combination under the same conditions. The soils treated using biodegradable acids had low remaining concentrations of arsenic that are primarily contained in the crystalline iron oxides and organic matter fractions. The close correlation between extracted arsenic and extracted iron/aluminum suggested that arsenic was removed via the dissolution of Fe/Al oxides in soils. The fractionation of arsenic in four contaminated soils was investigated using a modified sequential extraction method. Regarding fractionation, we found that most of the soil contained high proportions of arsenic (As) in exchangeable fractions with phosphorus, amorphous oxides, and crystalline iron oxides, while a small amount of the arsenic fraction was organic matter-bound. This study indicated that biodegradable organic acids can be considered as a means for arsenic-contaminated soil remediation.

Suggested Citation

  • Thinh Nguyen Van & Yasuhito Osanai & Hai Do Nguyen & Kiyoshi Kurosawa, 2017. "Arsenic Speciation and Extraction and the Significance of Biodegradable Acid on Arsenic Removal—An Approach for Remediation of Arsenic-Contaminated Soil," IJERPH, MDPI, vol. 14(9), pages 1-16, August.
    • Handle: RePEc:gam:jijerp:v:14:y:2017:i:9:p:990-:d:110492
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    References listed on IDEAS

    as
    1. Thinh Nguyen Van & Akinori Ozaki & Hoang Nguyen Tho & Anh Nguyen Duc & Yen Tran Thi & Kiyoshi Kurosawa, 2016. "Arsenic and Heavy Metal Contamination in Soils under Different Land Use in an Estuary in Northern Vietnam," IJERPH, MDPI, vol. 13(11), pages 1-13, November.
    2. Gui-Rong Wu & Hua-Long Hong & Chong-Ling Yan, 2015. "Arsenic Accumulation and Translocation in Mangrove ( Aegiceras corniculatum L. ) Grown in Arsenic Contaminated Soils," IJERPH, MDPI, vol. 12(7), pages 1-10, June.
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    Cited by:

    1. Sicheng Li & Weibin Pan & Lizhi Tong & Yuanyuan Hu & Yulin Zou & Xiaojia Huang, 2023. "Remediation of Sb-Contaminated Soil by Low Molecular Weight Organic Acids Washing: Efficiencies and Mechanisms," Sustainability, MDPI, vol. 15(5), pages 1-18, February.
    2. Jessica Álvarez-Quintana & Rodrigo Álvarez & Almudena Ordóñez, 2020. "Arsenic in Soils Affected by Mining: Microscopic Studies vs. Sequential Chemical Extraction," IJERPH, MDPI, vol. 17(22), pages 1-13, November.

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