Digoarachchi et al. 2022 - Determination of Geographical and Seasonal Variations of Heavy Metals in Swordfish (Xiphias gladius) and Yellowfin Tuna (Thunnus albacares)
This study used secondary export-company testing data to map geographical variation in heavy metals in swordfish and yellowfin tuna associated with the Sri Lankan export fish market.
Key numbers
Source units are ppm/mg/kg as mapped categories unless otherwise stated.
- Hg accumulated in swordfish: n=302, collected June to September 2017.
- Heavy metals in yellowfin tuna: n=33, collected January 2015 to August 2017.
- Cd, As, and Pb were not detected in the fish samples according to the abstract.
- Mercury was the main accumulated metal; mapped swordfish Hg categories were 0.00-0.60, 0.60-0.80, 0.80-1.00, and 1.00-2.00 ppm.
- The highest mercury accumulation was identified at longitudes 64-70 and latitudes 0-8.
Methods
The study used log-sheet waypoints from two major fish export companies and QGIS mapping of Hg values. Export-company testing was conducted once per three months.
Implications
The source is useful for geographic/seasonal swordfish mercury context and for non-detect flags for Cd, As, and Pb in the tested export dataset. The mapped categories should not be mistaken for individual sample values.
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Verification notes
- Source identity checked against DOI 10.47191/ijcsrr/V5-i7-03 and the downloaded PDF.
- The paper misspells lead as “Led” in several places; this page records the analyte as Pb.
Page history
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