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Article: Occurrence and geochemical behavior of arsenic in a coastal aquifer-aquitard system of the Pearl River Delta, China

TitleOccurrence and geochemical behavior of arsenic in a coastal aquifer-aquitard system of the Pearl River Delta, China
Authors
Issue Date2012
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/scitotenv
Citation
Science of the Total Environment, 2012, v. 427-328, p. 286-297 How to Cite?
AbstractElevated concentrations of arsenic, up to 161 mug/L, have been identified in groundwater samples from the confined basal aquifer underlying the aquitard of the Pearl River Delta (PRD). Both aquatic arsenic in pore water and solid arsenic in the sediments in the basal aquifer and aquitard were identified. Arsenic speciation of groundwater in the basal aquifer was elucidated on a pH-Eh diagram. In the PRD, arsenic is enriched in groundwater having both low and high salinity, and arsenic enriched groundwater is devoid of dissolved oxygen, has negative Eh values, is slightly alkaline, and has abnormally high concentrations of ammonium and dissolved organic carbon, but low concentrations of nitrate and nitrite. Results of geochemical and hydrochemical analyses and sequential extraction analysis suggest that reductive dissolution of iron oxyhydroxide could be one of the important processes that mobilized solid arsenic. We speculate that mineralization of sedimentary organic matter could also contribute to aquatic arsenic. Scanning electron microscope analysis confirms that abundant authigenic pyrite is present in the sediments. Sulphate derived from paleo-seawater served as the important sulfur source for authigenic pyrite formation. Co-precipitation of arsenic with authigenic pyrite significantly controlled concentrations of aquatic arsenic in the coastal aquifer-aquitard system.
Persistent Identifierhttp://hdl.handle.net/10722/151377
ISSN
2015 Impact Factor: 3.976
2015 SCImago Journal Rankings: 1.702
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council
Hong Kong Special Administrative Region, ChinaHKU 702707P
HKU 703109P
HKU 703010P
China Geological Survey
Guangdong Geological Survey
"Sustainable Water Environment" Strategic Research Sub-Theme in HKU
Funding Information:

This study was financially supported by the General Research Fund of the Research Grants Council, the Hong Kong Special Administrative Region, China (HKU 702707P, HKU 703109P, and HKU 703010P), China Geological Survey, Guangdong Geological Survey and "Sustainable Water Environment" Strategic Research Sub-Theme in HKU. We thank Kouping Chen, Vicky Fung, and Yali Sun for assistance with well drilling, sampling, testing in the field and major ion analysis in the laboratory. We also would like to thank the anonymous reviewers for their valuable comments and suggestions to improve the quality of the paper.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorWang, Yen_US
dc.contributor.authorJiao, JJen_US
dc.contributor.authorCherry, JAen_US
dc.date.accessioned2012-06-26T06:21:22Z-
dc.date.available2012-06-26T06:21:22Z-
dc.date.issued2012en_US
dc.identifier.citationScience of the Total Environment, 2012, v. 427-328, p. 286-297en_US
dc.identifier.issn0048-9697en_US
dc.identifier.urihttp://hdl.handle.net/10722/151377-
dc.description.abstractElevated concentrations of arsenic, up to 161 mug/L, have been identified in groundwater samples from the confined basal aquifer underlying the aquitard of the Pearl River Delta (PRD). Both aquatic arsenic in pore water and solid arsenic in the sediments in the basal aquifer and aquitard were identified. Arsenic speciation of groundwater in the basal aquifer was elucidated on a pH-Eh diagram. In the PRD, arsenic is enriched in groundwater having both low and high salinity, and arsenic enriched groundwater is devoid of dissolved oxygen, has negative Eh values, is slightly alkaline, and has abnormally high concentrations of ammonium and dissolved organic carbon, but low concentrations of nitrate and nitrite. Results of geochemical and hydrochemical analyses and sequential extraction analysis suggest that reductive dissolution of iron oxyhydroxide could be one of the important processes that mobilized solid arsenic. We speculate that mineralization of sedimentary organic matter could also contribute to aquatic arsenic. Scanning electron microscope analysis confirms that abundant authigenic pyrite is present in the sediments. Sulphate derived from paleo-seawater served as the important sulfur source for authigenic pyrite formation. Co-precipitation of arsenic with authigenic pyrite significantly controlled concentrations of aquatic arsenic in the coastal aquifer-aquitard system.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/scitotenven_US
dc.relation.ispartofScience of the Total Environmenten_US
dc.subject.meshArsenic - chemistry-
dc.subject.meshChina-
dc.subject.meshGeologic Sediments - chemistry-
dc.subject.meshGroundwater - chemistry-
dc.subject.meshWater Movements-
dc.titleOccurrence and geochemical behavior of arsenic in a coastal aquifer-aquitard system of the Pearl River Delta, Chinaen_US
dc.typeArticleen_US
dc.identifier.emailWang, Y: wangya@hku.hken_US
dc.identifier.emailJiao, JJ: jjiao@hku.hk-
dc.identifier.authorityJiao, JJ=rp00712en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.scitotenv.2012.04.006en_US
dc.identifier.pmid22554534-
dc.identifier.scopuseid_2-s2.0-84861184581en_US
dc.identifier.hkuros205143-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84861184581&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume427-328en_US
dc.identifier.spage286en_US
dc.identifier.epage297en_US
dc.identifier.isiWOS:000305111300032-
dc.publisher.placeNetherlandsen_US
dc.relation.projectOrigin and evolution of abnormally high ammonium groundwater in the Pearl River Delta and its environmental impact-
dc.relation.projectGeneration and Migration of High-Salinity Groundwater in the Pearl River Delta-
dc.relation.projectHydrogeological and Geochemical Characterization of Clay-Rich Aquitards in the Pearl River Delta-
dc.identifier.scopusauthoridCherry, JA=55206884800en_US
dc.identifier.scopusauthoridJiao, JJ=7102382963en_US
dc.identifier.scopusauthoridWang, Y=23494212100en_US
dc.identifier.citeulike10645252-

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