Risk assessment of heavy metals contaminations in fish and shellfish sold in Sabah

Chai , Woon Fu (2009) Risk assessment of heavy metals contaminations in fish and shellfish sold in Sabah. Universiti Malaysia Sabah. (Unpublished)

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Abstract

Five species of marine fish and two species of shellfish obtained from various fish markets in different districts of Sabah were analyzed to determine the content of heavy metals (As, Cd, Pb, Hg, Cr, Ni, Mn, Cu, Sb and Ba). Risk assessment was carried out as well by using the formula suggested by US EPA for chronic non-cancer risk and cancer risk due to heavy metals contamination. The concentrations of heavy metals were analyzed by using Inductively Coupled Plasma-Mass Spectrometry (ICPMS). The high mean concentrations of heavy metals found in muscle of fish were arsenic (9.70mg/kg dry weight) and copper (2.58 mg/kg dry weight) while for shellfish, concentrations of manganese, arsenic, copper, nickel, barium and chromium were the highest. Longtail tuna (Thunnus tonggol) and blood cockle (Anadara granosa) were found to have relatively higher concentrations of heavy metals if compared to the other species whereby longtail tuna contained higher copper, lead and cadmium content. Fishes obtained from Kota Kinabalu, Sandakan and Tawau and shellfish from Kota Kinabalu were found to be more contaminated with heavy metals. Furthermore, lead was found to be negatively correlated with big-sized fish but copper had positive correlation with small-sized fish. Arsenic was the only metal that exceeded the maximum permitted level in the Malaysia Food Regulations 1985.Fish and shellfish consumption per capita were found to be about 55.5kg and 1.87kg respectively. Estimated daily intake (EDI) for fish had arsenic level higher than the guideline values by US EPA and JECFA. The hazard quotient value exceeded 1 indicating there is a risk for chronic non-cancer disease due to dietary intake of arsenic via fish. In addition, the probable cancer risk due to arsenic exposure was more than 10⁻⁶ indicating that the consumption of fish at the present rate may be hazardous to consumers. As a whole, arsenic in fish sold in east Malaysia is relatively higher than the other heavy metals analyzed. This implies that the fish and fishery products sold in the markets may pose adverse health risks.

Item Type:Academic Exercise
Uncontrolled Keywords:Fish, Shellfish, Heavy metals, Inductively Coupled Plasma-Mass Spectrometry, Kota Kinabalu, Sandakan, Tawau,
Subjects:S Agriculture > SH Aquaculture. Fisheries. Angling
Divisions:SCHOOL > School of Food Science and Nutrition
ID Code:3494
Deposited By:IR Admin
Deposited On:15 Feb 2012 16:02
Last Modified:15 Feb 2012 16:02

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