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Seasonal and Diurnal Redox Cycles Influence Arsenic Mobility in Aquatic Systems

This study examines the intricate relationships between redox cycles and arsenic mobility during dry and monsoon seasons, highlighting the dual processes of oxidation and reduction. During the dry season, arsenic is immobilized in the form of sulfide minerals and iron hydroxides, while in the monsoon, microbial respiration mobilizes arsenic into the aqueous phase driven by organic carbon influx from ponds. This research addresses the significant environmental implications of these cycles on arsenic behavior and its potential risks in affected ecosystems.

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Seasonal and Diurnal Redox Cycles Influence Arsenic Mobility in Aquatic Systems

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  1. (Dittmar et al, 2007 Environmental Science & Technology, Roberts et al, 2007 Environmental Science & Technology) Diagram based on that in (Polizotto et al, 2006 Chemical Geology) Oxidation => As Immobilization (Dry Season) As(III)-sulfide minerals As(III) Fe(III) hydroxides As(III) Aqueous As(III) Mobilized to Depth (Polizotto et al, 2006 Chemical Geology) (Harvey 2006) Reduction => As Mobilization (Monsoon Season) microbial respiration, driven by organic carbon from ponds (Harvey et al, 2006 Chemical Geology)

  2. Diurnal in addition to Seasonal Redox Cycles? Oxidation => As Immobilization As(III)-sulfide minerals As(III) Fe(III) hydroxides As(III) Aqueous As(III) Mobilized to Depth Reduction => As Mobilization microbial respiration, driven by organic carbon from ponds

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