Document Detail


A case study on fuel oil contamination in a mangrove swamp in Hong Kong.
MedLine Citation:
PMID:  16023144     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Mangroves commonly found along tropical and subtropical coastlines are susceptible to oil pollution. In December 2000, around 500 1 m tall Kandelia candel saplings at the age of 3-5 years old located at the foreshore region of Sheung Pak Nai swamp, Hong Kong SAR, were found to be damaged by oil pollution. More than 80% of the saplings were either dead or washed away and leaving less than 5% healthy saplings with dense green leaves. Elevated concentrations of light n-alkanes (ranging from n-C14 to n-C20), pristane and phytane were recorded in surface sediments collected in December 2000. The ratio between light and total n-alkanes was 0.4. The total petroleum hydrocarbons (60-80 microg g(-1) TPH) and unresolved complex mixtures (60-70 microg g(-1) UCM) were higher than the background values of other mangrove sediments in Hong Kong, which were 40 and 20 microg g(-1), respectively. In certain root zone sediments, TPH concentrations were above 1000 microg g(-1). These results suggest that surface sediments in Sheung Pak Nai were contaminated by petroleum oil, most likely by illegal discharge of fuel oil which occurred between 1998 and 2002. One year later, in December 2001, unhealthy saplings had recovered and re-grown. The concentrations of TPH and UCM in sediments declined to around 40 microg g(-1), pristane and phytane dropped by 80%, and the ratio of light to total n-alkanes was 0.15, suggesting that residual oil in sediments was weathered leading to a remarkable recovery of the unhealthy saplings.
Authors:
Nora F Y Tam; Teresa W Y Wong; Y S Wong
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Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2005-07-14
Journal Detail:
Title:  Marine pollution bulletin     Volume:  51     ISSN:  0025-326X     ISO Abbreviation:  Mar. Pollut. Bull.     Publication Date:  2005  
Date Detail:
Created Date:  2005-11-18     Completed Date:  2006-08-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0260231     Medline TA:  Mar Pollut Bull     Country:  England    
Other Details:
Languages:  eng     Pagination:  1092-100     Citation Subset:  IM    
Affiliation:
Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong.
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MeSH Terms
Descriptor/Qualifier:
Alkenes / analysis
Analysis of Variance
Diterpenes / analysis
Environmental Monitoring / statistics & numerical data*
Environmental Pollutants / analysis*,  toxicity
Geologic Sediments / analysis*
Hong Kong
Petroleum / analysis*,  toxicity
Rhizophoraceae / drug effects*,  growth & development
Terpenes / analysis
Chemical
Reg. No./Substance:
0/Alkenes; 0/Diterpenes; 0/Environmental Pollutants; 0/Petroleum; 0/Terpenes; 1921-70-6/pristane; 638-36-8/phytane

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


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