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Case Study

Total Diet Study approach in estimating mercury and cadmium levels using selected fish: A case study from Sri Lanka

Authors:

G. D. T. M. Jayasinghe,

National Aquatic Resources Research & Development Agency (NARA), Colombo 15, LK
About G. D. T. M.
Analytical Chemistry Laboratory (ACL)
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K. P. G. L. Sandaruwan,

National Aquatic Resources Research & Development Agency (NARA), Colombo 15, LK
About K. P. G. L.
Socio-Economic & Marketing Division
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D. W. L. U. Silva,

National Aquatic Resources Research & Development Agency (NARA), Colombo 15, LK
About D. W. L. U.
Socio-Economic & Marketing Division
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B. K. K. K. Jinadasa

National Aquatic Resources Research & Development Agency (NARA), Colombo 15, LK
About B. K. K. K.
Analytical Chemistry Laboratory
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Abstract

Total Diet Study (TDS) is a world-recognized approach in quantifying nutrients and contaminants in complete diets. In the present study, the TDS approach was used to determine the dietary exposure to mercury (Hg) and cadmium (Cd) by regular consumption of yellowfin tuna (YFT), swordfish (SWF) and sardinella (SAF) fish in Gampaha district, Sri Lanka. The study was based on the TDS method established by the World Health Organization (WHO). Hg and Cd were analyzed using Atomic Absorption Spectrophotometer after microwave digestion of samples. Survey results revealed that the weekly average fresh fish consumption was 301 g per person. Hg and Cd levels were calculated on the wet weight basis. The maximum allowable limits of Hg and Cd were compared with European Union/European Commission (EU/EC) regulation limits for each species. None of the samples exceeded the EU/EC maximum limit for Cd, but two samples of SWF exceeded the maximum limit for Hg, recommended by the EU/EC. The Provisional Tolerable Weekly Intake (PTWI) for Hg was calculated for risk assessment. The percentage contributions of SWF, YFT, and SAF for PTWI-Hg were 64.92 and 40.16 and 8.55 respectively. Accordingly, the SWF were close to exceed the PTWI value. YFT and SWF are considered as the top predators in the marine food web. Cooking did not significantly reduce the Hg and Cd contents in selected fish species. Further studies are recommended to evaluate the PTWI values for predatory fish species before consumption.
How to Cite: Jayasinghe, G. D. T. M., Sandaruwan, K. P. G. L., Silva, D. W. L. U., & Jinadasa, B. K. K. K. (2018). Total Diet Study approach in estimating mercury and cadmium levels using selected fish: A case study from Sri Lanka. Ceylon Journal of Science, 47(3), 275–279. DOI: http://doi.org/10.4038/cjs.v47i3.7534
Published on 25 Sep 2018.

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