Document Detail


Arsenic and manganese contamination of drinking water resources in Cambodia: coincidence of risk areas with low relief topography.
MedLine Citation:
PMID:  17438755     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Arsenic contamination of groundwater has been identified in Cambodia, where some 100,000 family-based wells are used for drinking water needs. We conducted a comprehensive groundwater survey in the Mekong River floodplain, comprising an area of 3700 km(2) (131 samples, 30 parameters). Seasonal fluctuations were also studied. Arsenic ranged from 1 to 1340 microg L(-1) (average 163 microg L(-1)), with 48% exceeding 10 microg L(-1). Elevated manganese levels (57% >0.4 mg L(-1)) are posing an additional health threat to the 1.2 million people living in this area. With 350 people km(-2) potentially exposed to chronic arsenic poisoning, the magnitude is similar to that of Bangladesh (200 km(-2)). Elevated arsenic levels are sharply restricted to the Bassac and Mekong River banks and the alluvium braided by these rivers (Kandal Province). Arsenic in this province averaged 233 microg L(-1) (median 100 microg L(-1)), while concentrations to the west and east of the rivers were <10 microg L(-1). Arsenic release from Holocene sediments between the rivers is most likely caused by reductive dissolution of metal oxides. Regions exhibiting low and elevated arsenic levels are co-incident with the present low relief topography featuring gently increasing elevation to the west and east of a shallow valley-understood as a relict of pre-Holocene topography. The full georeferenced database of groundwater analysis is provided as Supporting Information.
Authors:
Johanna Buschmann; Michael Berg; Caroline Stengel; Mickey L Sampson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  41     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-04-18     Completed Date:  2007-08-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2146-52     Citation Subset:  IM    
Affiliation:
Swiss Federal Institute of Aquatic Science and Technology, Eawag, CH-8600 Dübendorf Switzerland, and Resource Development International-Cambodia, RDIC, P.O. Box 494, Phnom Penh, Cambodia.
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MeSH Terms
Descriptor/Qualifier:
Analysis of Variance
Arsenic / analysis*
Cambodia
Environmental Monitoring / statistics & numerical data*
Fresh Water / chemistry*
Geography
Humans
Manganese / analysis*
Mass Spectrometry
Risk Assessment
Seasons
Spectrometry, Fluorescence
Water Pollutants, Chemical / analysis*
Water Supply / analysis*
Chemical
Reg. No./Substance:
0/Water Pollutants, Chemical; 7439-96-5/Manganese; 7440-38-2/Arsenic

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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