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    Processes controlling arsenic enrichment along the eastern Arabian Sea surficial sediments

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    Date
    2019
    Author
    PrakashBabu, C.
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    Abstract
    The processes enriching redox-sensitive arsenic (As) was investigated in 111 surficial sediments (27-3679�m water depth) overlain by varying levels of dissolved oxygen along the eastern Arabian Sea. Under oxygenated conditions, diagenetic enrichment of As was noticed at deeper water depths (> 1200�m), while lattice held As dominant at few station from shallow depths (< 150�m). In sediments impinged by oxygen minimum zone (OMZ; 150-1200�m), As is released from organic matter during sub-oxic diagenesis. As seems to precipitate as As/iron sulfide mineral under intense OMZ based on a positive correlation between As and S and Cd in northeastern part of the study area, while As may diffuse to water column under less intense OMZ evidenced by lack of correlation between As and S and Cd in southeastern part. Several processes can enrich As. A careful approach is recommended for its usage in understanding anthropogenic sources, transport, and paleodepositional environment along eastern Arabian Sea.
    URI
    https://doi.org/10.1007/s12665-019-8515-6
    http://drs.nio.org/drs/handle/2264/8208
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