Correlation Analysis of Total Mercury and Methyl Mercury in Marine Fishes from Two Coastal Regions in Guangdong
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Abstract:
20 species of the local major producing marine fish in the eastern and western coastal regions of Guangdong province were selected for investigation of the total mercury and methyl mercury pollution of the marine fish. The direct mercury analyzer and the high performance liquid chromatography-online UV reduction-atomic fluorescence spectrometry were conducted to determine the contents of the two mercury species in 133 samples from 20 species of fish, like Trachinotus ovatus, Silver sillago, Scomberomorus niphonius, etc. The total mercury content (T-Hg) in marine fish from eastern Guangdong was ranged from 15.35 to 201.68 ng/g, while the methyl mercury content (MeHg) was ranged from 8.32 to 200.20ng/g, which accounted for 72.93% of the T-Hg content. Similarly, the T-Hg in marine fish from western Guangdong was ranged from11.32 to 156.00 ng/g, while the MeHg was ranged from 11.05 to 155.60 ng/g, which accounted for 83.39% of the T-Hg content. Neither of T-Hg and MeHg from the fish samples exceeded the GB2762-2017 China National Food Safety Standard in this study. Methyl mercury is the main species of mercury in fish muscle, and the average level of MeHg/T-Hg accounted for 76.45%. The varieties were also found from two aspects, including geographical diversities and fish category diversities.
