Risk assessment of heavy metals in fish and fishery products sold in Sabah

Yong, Oi Moi (2010) Risk assessment of heavy metals in fish and fishery products sold in Sabah. Universiti Malaysia Sabah. (Unpublished)

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Abstract

This study was conducted to assess the risk of heavy metals exposures via the consumption of fish and fishery products that sold in Sabah. Samples were obtained from various landing sites in Kota Kinabalu, Kudat, Sandakan, and Kunak. Three fish species namely torpedo scad (Megalaspic cordyla), tiger-toothed croaker (Otolithes ruber), and oxeye scad (Selar boops) and the three fishery products of study are dried cuttlefish, dried shrimp, and dried scallop were selected in this study. Wet ashing was employed to digest the samples prior to the determination of heavy metal levels using Inductively Coupled Plasma- Mass Spectrometry (ICP-MS). The highest levels of total arsenic (6.977 mg/kg) and cadmium (0.233 mg/kg) were found in oxeye scad, the highest levels of lead (0.906 mg/kg) and antimony (3.880 μg/kg) were found in tiger-toothed croaker while the highest levels of mercury (22.210 μg/kg) and chromium (2.907 mg/kg) were found in torpedo scad. Among fishery products, the highest levels of cadmium (3.231 mg/kg), lead (0.627 mg/kg), mercury (32.030 j.Jg/kg), and antimony (13.890 μg/kg) were found in dried scallop, highest levels of total arsenic (29.014 mg/kg) was found in dried cuttlefish, and dried shrimp was found to contain highest levels of chromium (5.223 mg/kg). The levels of manganese, nickel and chromium in torpedo scad and the chromium levels in tiger-toothed croaker and oxeye scad are significantly different among the four sampling sites. All heavy metal levels except manganese in pelagic fish did not significantly different from demersal fish. Only arsenic, cadmium, and barium were found negatively correlated with total body length and or body weight (p<0.05). The total arsenic levels in all fish and fishery product samples and the cadmium levels in dried cuttlefish and scallop were found to exceed the maximum permitted limits by Malaysian Food Regulations 1985. The dietary exposure to all heavy metal of an individual of 60kg body weight via the consumption of all six samples in this study is within the provisional tolerable weekly intake (PTWI) set by JECFA. The Hazard Index (HI) of arsenic and cadmium of the total samples were found > 1, consumers are exposed to the carcinogenic risk of arsenic and non-carcinogenic risk of cadmium. Overall, the daily consumption of the samples is safe.

Item Type: Academic Exercise
Uncontrolled Keywords: Fish, Risk heavy metals, Consumption of fish, Fishery products, Fishing industry, Sabah
Subjects: T Technology > TX Home economics > Nutrition. Foods and food supply
Divisions: SCHOOL > School of Food Science and Nutrition
Depositing User: Unnamed user with email storage.bpmlib@ums.edu.my
Date Deposited: 22 May 2012 09:53
Last Modified: 23 Oct 2017 03:30
URI: http://eprints.ums.edu.my/id/eprint/3991

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