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Effects of natural organic matter on the coprecipitation of arsenic with iron

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Abstract

Natural organic matter (NOM) can affect arsenic speciation and mobility in the environment. In this study, the effects of NOM on the coprecipitation of arsenic with iron were investigated in order to better understand the fate and transport of arsenic in natural environments. The coprecipitation of arsenic with iron was studied in the presence and absence of NOM under various arsenic-to-iron molar ratios (As/Fe) and pH conditions. The addition of humic acid (HA) hindered the As–Fe coprecipitation under high pH and high As/Fe conditions by forming a soluble As–Fe–HA complex. The X-ray diffraction and Fourier transform infrared studies showed that the As–Fe-coprecipitated solid phase was highly affected by pH and As/Fe. The arsenic was coprecipitated with iron as an amorphous ferric arsenate phase at a low pH level or high As/Fe conditions, while the formation of ferrihydrite phase and the arsenic incorporation to the ferrihydrite by adsorption was predominant at high pH levels or low As/Fe conditions. The HA affected the As–Fe-coprecipitated solid phase depending on the As/Fe molar ratio under neutral and alkaline conditions.

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Acknowledgments

This study was supported by Korea Environment Industry and Technology Institute (KEITI) through Geo-Advanced Innovation Action Program (2013000550006).

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Authors and Affiliations

  1. Department of Bioactive Material Sciences, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju, Jeollabukdo, 561-675, Republic of Korea

    Eun Jung Kim & Kitae Baek

  2. Department of Environmental Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju, Jeollabukdo, 561-675, Republic of Korea

    Bo-Ram Hwang & Kitae Baek

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  1. Eun Jung Kim
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  2. Bo-Ram Hwang
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  3. Kitae Baek
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Correspondence to Kitae Baek.

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Kim, E.J., Hwang, BR. & Baek, K. Effects of natural organic matter on the coprecipitation of arsenic with iron. Environ Geochem Health 37, 1029–1039 (2015). https://doi.org/10.1007/s10653-015-9692-1

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  • DOI: https://doi.org/10.1007/s10653-015-9692-1

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