The tusk （Brosme brosme） is a popular gadoid fish for human consumption, which also is susceptible to mercury accumulation. However, few data of mercury levels in tusk exist, and it is difficult to compare tusk fish...The tusk （Brosme brosme） is a popular gadoid fish for human consumption, which also is susceptible to mercury accumulation. However, few data of mercury levels in tusk exist, and it is difficult to compare tusk fished from assumed contaminated areas with background levels. The aim of this study was to increase the information of mercury levels observed in tusk from the Northeast Atlantic Ocean. Samples of tusk were collected from seven different localities in open ocean areas, nine along the Norwegian coastal current （NCC）, and from two fjord stations. Determinations of mercury in muscle and liver were carried out using inductive coupled plasma mass spectrometry （ICPMS） after microwave-assisted wet digestion. The highest concentrations of mercury in muscle were found in tusk captured from the fjords Hardangerfjord and Sorfjord, and had mean concentrations of mercury at 1.5 and 1.7 mg kg＂~ wet weight （ww）, respectively, where all of the tusk exceeded EU＇s upper limit of 0.5 mg kg1 ww. The lowest concentrations of mercury were observed in tusk captured from the open ocean areas, and the concentrations ranged from 0.08 to 0.30 mg kg-1 ww. Mercury concentrations of tusk captured along the NCC ranged from 0.21 to 0.49 mg kg-1 ww. Mercury concentrations increased with the weight of the tusk, and variance analysis （ANOVA） of weight normalized mercury concentrations showed that there were significant differences in mercury concentrations between tusk collected from the open ocean, NCC and fjords, which indicates that differences in mercury concentration between different areas arecaused by other factors.展开更多
文摘The tusk （Brosme brosme） is a popular gadoid fish for human consumption, which also is susceptible to mercury accumulation. However, few data of mercury levels in tusk exist, and it is difficult to compare tusk fished from assumed contaminated areas with background levels. The aim of this study was to increase the information of mercury levels observed in tusk from the Northeast Atlantic Ocean. Samples of tusk were collected from seven different localities in open ocean areas, nine along the Norwegian coastal current （NCC）, and from two fjord stations. Determinations of mercury in muscle and liver were carried out using inductive coupled plasma mass spectrometry （ICPMS） after microwave-assisted wet digestion. The highest concentrations of mercury in muscle were found in tusk captured from the fjords Hardangerfjord and Sorfjord, and had mean concentrations of mercury at 1.5 and 1.7 mg kg＂~ wet weight （ww）, respectively, where all of the tusk exceeded EU＇s upper limit of 0.5 mg kg1 ww. The lowest concentrations of mercury were observed in tusk captured from the open ocean areas, and the concentrations ranged from 0.08 to 0.30 mg kg-1 ww. Mercury concentrations of tusk captured along the NCC ranged from 0.21 to 0.49 mg kg-1 ww. Mercury concentrations increased with the weight of the tusk, and variance analysis （ANOVA） of weight normalized mercury concentrations showed that there were significant differences in mercury concentrations between tusk collected from the open ocean, NCC and fjords, which indicates that differences in mercury concentration between different areas arecaused by other factors.
