0000000000184345

AUTHOR

Madhukar V. M. Desai

showing 2 related works from this author

How Humic Substances Dominate Mercury Geochemistry in Contaminated Floodplain Soils and Sediments

1998

The interaction of mercury (Hg) and humic substances (hs) was studied in floodplain topsoils and surface sediments of the contaminated German river Elbe. An intimate coupling exists between the geochemical cycles of Hg and organic carbon (OC) in this ecosystem. Humic substances exert a dominant influence on several important parallel geochemical pathways of Hg, including binding, transformation, and transport processes. Significant differences exist between the Hg-hs associations in floodplains and sediments. Both humic acids (ha) and fulvic acids (fa) contribute to Hg binding in the sediments. In contrast, ultrafiltration experiments proved that Hg in the floodplain soils is almost exclusi…

chemistry.chemical_classificationMERCURETotal organic carbonEnvironmental EngineeringSoil chemistrychemistry.chemical_elementManagement Monitoring Policy and LawPollutionRedoxGeochemical cycleHumusMercury (element)chemistryEnvironmental chemistryHumic acidWaste Management and DisposalWater Science and TechnologyJournal of Environmental Quality
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Mercury Speciation in Floodplain Soils and Sediments along a Contaminated River Transect

1998

A novel mercury-specific sequential extraction procedure (SEP) for the assessment of mercury (Hg) speciation in soils and sediments, with emphasis on studying the interaction between Hg and organic matter (OM), was developed and tested. It was applied to determine Hg speciation in floodplain topsoils and surface sediments along the Hg-contaminated part of the river Elbe, and to simultaneously derive some information on the (re)mobilization potentials for Hg from these matrices. The majority of the total Hg in the ecosystem today is bound in the floodplains, which also still geographically reflect the historic emission record. Most of the Hg in both matrices is bound strongly to OM, suggesti…

chemistry.chemical_classificationgeographyEnvironmental Engineeringgeography.geographical_feature_categoryFloodplainEcologychemistry.chemical_elementManagement Monitoring Policy and LawContaminationPollutionFloodplain soilsMercury (element)chemistryEnvironmental chemistrySoil waterEnvironmental scienceOrganic matterEcosystemTransectWaste Management and DisposalWater Science and TechnologyJournal of Environmental Quality
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