Document Detail


An assessment of mercury loading in core sediments of Sunderban mangrove wetland, India (a preliminary report).
MedLine Citation:
PMID:  18506380     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This is a preliminary report on total mercury (T(Hg)) in core sediments (<63 microm particle size) of Sunderban mangrove wetland, northeastern part of the Bay of Bengal, India. Cold vapor atomic absorption spectrometry (CVAAS) was used for T(Hg) determination. The concentration varies from 9.8 to 535.1 ppb (ngg(-1)). Results revealed variations over premonsoon and postmonsoon month at different core depth, as well as in studied three sampling stations, located at the site of three rivers: Hugli River (S(1)), Matla River (S(2)) and Bidyadhari River (S(3)). Elevated concentration of T(Hg) in subsurface layer (4-8 cm) of the core at S(2) is attributed to remobilization of mercury from deeper sediment (32-36 cm). Positive correlation is present between total Hg and clay content. Based on index of geoaccumulation (I(geo)) and Effects-Range Low (ER-L) value (150 ppb) it is considered that the sediments are till now unpolluted. As a consequence, there is less chance of ecotoxicological risk to organisms living in studied sediments. Two statistical methods were applied to determine T(Hg) anomalies. Box plot method showed one extreme and three outliers in S(1) at postmonsoon season. Two extremes were found at S(2) at 4-8 and at 32-36 cm in premonsoon period. In S(3) there was no anomaly by box plot method. MAD method was more sensitive than box plot method and T(Hg) anomaly was detected at 12-16 cm in S(3) during postmonsoon season. The data reported are useful baselines for T(Hg) in Sunderban mangrove wetland, India and would be of help in future sediment quality studies.
Authors:
Z Kwokal; S K Sarkar; M Chatterjee; S Franciskovis-Bilinski; H Bilinski; A Bhattacharya; B D Bhattacharya; Md Aftab Alam
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-05-28
Journal Detail:
Title:  Bulletin of environmental contamination and toxicology     Volume:  81     ISSN:  0007-4861     ISO Abbreviation:  Bull Environ Contam Toxicol     Publication Date:  2008 Jul 
Date Detail:
Created Date:  2008-07-01     Completed Date:  2008-12-05     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0046021     Medline TA:  Bull Environ Contam Toxicol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  105-12     Citation Subset:  IM    
Affiliation:
Centre for Marine and Environmental Research, Rudjer Boskovic Institute, P.O. Box 180, 10001 Zagreb, Croatia.
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MeSH Terms
Descriptor/Qualifier:
Analysis of Variance
Geologic Sediments / analysis*
Hydrogen-Ion Concentration
India
Mercury / analysis*
Plants / chemistry
Rhizophoraceae / chemistry*
Seasons
Soil Pollutants / analysis
Spectrophotometry, Atomic
Water Pollutants, Chemical / analysis
Wetlands*
Chemical
Reg. No./Substance:
0/Soil Pollutants; 0/Water Pollutants, Chemical; 7439-97-6/Mercury

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


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