[Objective] To evaluate the risk of methylmercury hazards in fish and shellfsh products, and predict the possible harm and consequences, this study puts forward suggestions on the people’s intake of fish and shellfis...[Objective] To evaluate the risk of methylmercury hazards in fish and shellfsh products, and predict the possible harm and consequences, this study puts forward suggestions on the people’s intake of fish and shellfish and provides the basis for food safety regulation. [Method] Research progress in risk assessment of methylmercury intake from fish and shellfish is introduced in the study. [Result] Aquatic products are part of a healthy diet for human. However, almost all fsh and shellfish contain at least a trace amount of methylmercury. The methylmercury content in wild fsh is higher than that of cultured fsh. The methylmercury content in different aquatic products is in the order： carnivorous fsh 〉 omnivorous fsh 〉 flter-feeding fsh 〉 benthic organisms 〉 herbivorous fsh 〉 phytoplankton 〉 zooplankton, and the methylmercury content in different organs is in the order： back muscles 〉 belly muscles 〉 liver 〉 heart 〉 other organs and tissues. [Conclusion] The harm of methylmercury in fsh and shellfsh is of low risk and would not cause harm to health. However, women of childbearing age, pregnant woman, nursing woman and children should eat fsh with low mercury content and avoid some large-fsh intake.展开更多
Mercury (Hg) concentrations in the tissues (muscle, stomach, liver, gills, skin, and gonads) of five fish species (mullet Liza haematocheilus, flathead fish Platycephalus indicus, sea bass Lateolabrax japonicus, macke...Mercury (Hg) concentrations in the tissues (muscle, stomach, liver, gills, skin, and gonads) of five fish species (mullet Liza haematocheilus, flathead fish Platycephalus indicus, sea bass Lateolabrax japonicus, mackerel Scomberomorus niphonius and silver pomfret Pampus argenteus) collected from Laizhou Bay in the Bohai Sea of China were investigated. The results indicate that Hg bioaccumulation in the five fish was tissue- specific, with the highest levels in the muscle and liver, followed by the stomach and gonads. The lowest levels were found in the gills and skin. Fish at higher trophic levels (flathead fish and sea bass) exhibited higher Hg concentrations than consumers at lower trophic levels. Mercury bioaccumulation tended to be positively correlated with fish length in mullet, silver pomfret, mackerel, and flathead fish, but was negatively correlated with fish length in sea bass. The Hg concentrations in the muscles of all fish species in Laizhou Bay were within the permissible limits of food safety set by national and international criteria. However, the suggesting maximum consumption of sea bass is 263g per week for human health.展开更多
This study investigated the level of mercury in hair samples of pregnant women and newborns living in marshes. Hair mercury concentration, as an indicator of mercury body load, was studied in 30 samples of indigenous ...This study investigated the level of mercury in hair samples of pregnant women and newborns living in marshes. Hair mercury concentration, as an indicator of mercury body load, was studied in 30 samples of indigenous women and newborns to assess the association between fish consumption and specific characteristics that can influence exposure. In January 2013, 40 pregnant women were invited to participate. An interview was administered and a questionnaire was used to collect information about age, body weight, height, fish （fresh） consumption, pregnancy stage, residence duration, education level, family income and number of dental amalgam fillings. The results showed that for hair total Hg concentration was 6.47 p.g/g （6.47 ~ 0.71 pg/g）. About 5.9% of mothers had hair total Hg levels in excess of 14 ~tg/g. Maternal hair mercury was above the threshold level of WHO （World Health Organization） （5 pg/g）. As expected, there was a clear increase in hair Hg with reported fresh fish consumption （p = 0.08）. The highest mean in a group who consumed fish several times per week was 5.93 lag/g. Moreover, a significant effect of age and residential time on Hg in women＇s hair was found such as the older women.展开更多
Mercury （Hg） is an environmental pollutant, and can bioaccumulate and biomagnify in the food web. Twenty four fish samples of different tropic level i.e., Herbivore, Omnivore and Carnivore were collected from two co...Mercury （Hg） is an environmental pollutant, and can bioaccumulate and biomagnify in the food web. Twenty four fish samples of different tropic level i.e., Herbivore, Omnivore and Carnivore were collected from two contaminated rivers, the Megna and the Buriganga which surround the Dhaka division for the assessment of toxic Hg. Fourteen samples were found to contain Hg in the range of 0.01-0.09 mg/kg. The highest Hg （0.09 mg/kg） was found in the Carnivore, Bele （Glossogobius giuris）. However, all fish species had lower amount of Hg than the maximum Hg limit （0.5 mg/kg for fish） set by World Health Organization （WHO）. Among all the fish species, the order of bioaccumulation was carnivore 〉 omnivore 〉 herbivore. Kajoli （Ailia coila）, Shing （Heteropnuestes fossilis）, Rui （Labeo rohita）, Chewa （Tryauchen vagine）, Rita （Rita rita）, Hilsha （Tenualosa ilisha）, Small Puti （Puntius sophore）, Bacha （Eutropiichthys vacha） and Chingri （smallprawn） were not found to contain any Hg which indicated that fish species from these rivers are safe for human consumption.展开更多
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
By applying an indirect strategy, a new copper （II） complex of a thiosemicarbazone L has been successfully developed as a colorimetric cbemosensor for the sensitive detection of mercury （II） ions. In the presence ...By applying an indirect strategy, a new copper （II） complex of a thiosemicarbazone L has been successfully developed as a colorimetric cbemosensor for the sensitive detection of mercury （II） ions. In the presence of copper （II） ions, the colorless so- lution of L became yellow; however, upon the addition of traces of mercury （II） ions, the yellow color faded to colorless im- mediately. Other ions, including Fe3＋, Ag＋, Ca2＋, Zn2＋, Pb2＋, Cd2＋, Ni2＋, Co2＋, Cr3＋ and Mg2＋ had a negligible influence on the probe behavior. The detection limits were 5.0×10^-6 M and 3.0×10^-7 M of Hg2＋ using the visual color changes and UV-vis changes respectively. Test strips based on Cu-L were fabricated, which could act as a convenient and efficient Hg2＋ test kits.展开更多
文摘[Objective] To evaluate the risk of methylmercury hazards in fish and shellfsh products, and predict the possible harm and consequences, this study puts forward suggestions on the people’s intake of fish and shellfish and provides the basis for food safety regulation. [Method] Research progress in risk assessment of methylmercury intake from fish and shellfish is introduced in the study. [Result] Aquatic products are part of a healthy diet for human. However, almost all fsh and shellfish contain at least a trace amount of methylmercury. The methylmercury content in wild fsh is higher than that of cultured fsh. The methylmercury content in different aquatic products is in the order： carnivorous fsh 〉 omnivorous fsh 〉 flter-feeding fsh 〉 benthic organisms 〉 herbivorous fsh 〉 phytoplankton 〉 zooplankton, and the methylmercury content in different organs is in the order： back muscles 〉 belly muscles 〉 liver 〉 heart 〉 other organs and tissues. [Conclusion] The harm of methylmercury in fsh and shellfsh is of low risk and would not cause harm to health. However, women of childbearing age, pregnant woman, nursing woman and children should eat fsh with low mercury content and avoid some large-fsh intake.
基金Supported by the National Natural Science Foundation of China for International or Regional Research Cooperation and Exchange Project(No.31061160187)the National Natural Science Foundation of China for Creative Research Group(No.41121064)
文摘Mercury (Hg) concentrations in the tissues (muscle, stomach, liver, gills, skin, and gonads) of five fish species (mullet Liza haematocheilus, flathead fish Platycephalus indicus, sea bass Lateolabrax japonicus, mackerel Scomberomorus niphonius and silver pomfret Pampus argenteus) collected from Laizhou Bay in the Bohai Sea of China were investigated. The results indicate that Hg bioaccumulation in the five fish was tissue- specific, with the highest levels in the muscle and liver, followed by the stomach and gonads. The lowest levels were found in the gills and skin. Fish at higher trophic levels (flathead fish and sea bass) exhibited higher Hg concentrations than consumers at lower trophic levels. Mercury bioaccumulation tended to be positively correlated with fish length in mullet, silver pomfret, mackerel, and flathead fish, but was negatively correlated with fish length in sea bass. The Hg concentrations in the muscles of all fish species in Laizhou Bay were within the permissible limits of food safety set by national and international criteria. However, the suggesting maximum consumption of sea bass is 263g per week for human health.
文摘This study investigated the level of mercury in hair samples of pregnant women and newborns living in marshes. Hair mercury concentration, as an indicator of mercury body load, was studied in 30 samples of indigenous women and newborns to assess the association between fish consumption and specific characteristics that can influence exposure. In January 2013, 40 pregnant women were invited to participate. An interview was administered and a questionnaire was used to collect information about age, body weight, height, fish （fresh） consumption, pregnancy stage, residence duration, education level, family income and number of dental amalgam fillings. The results showed that for hair total Hg concentration was 6.47 p.g/g （6.47 ~ 0.71 pg/g）. About 5.9% of mothers had hair total Hg levels in excess of 14 ~tg/g. Maternal hair mercury was above the threshold level of WHO （World Health Organization） （5 pg/g）. As expected, there was a clear increase in hair Hg with reported fresh fish consumption （p = 0.08）. The highest mean in a group who consumed fish several times per week was 5.93 lag/g. Moreover, a significant effect of age and residential time on Hg in women＇s hair was found such as the older women.
文摘Mercury （Hg） is an environmental pollutant, and can bioaccumulate and biomagnify in the food web. Twenty four fish samples of different tropic level i.e., Herbivore, Omnivore and Carnivore were collected from two contaminated rivers, the Megna and the Buriganga which surround the Dhaka division for the assessment of toxic Hg. Fourteen samples were found to contain Hg in the range of 0.01-0.09 mg/kg. The highest Hg （0.09 mg/kg） was found in the Carnivore, Bele （Glossogobius giuris）. However, all fish species had lower amount of Hg than the maximum Hg limit （0.5 mg/kg for fish） set by World Health Organization （WHO）. Among all the fish species, the order of bioaccumulation was carnivore 〉 omnivore 〉 herbivore. Kajoli （Ailia coila）, Shing （Heteropnuestes fossilis）, Rui （Labeo rohita）, Chewa （Tryauchen vagine）, Rita （Rita rita）, Hilsha （Tenualosa ilisha）, Small Puti （Puntius sophore）, Bacha （Eutropiichthys vacha） and Chingri （smallprawn） were not found to contain any Hg which indicated that fish species from these rivers are safe for human consumption.
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.
基金supported by the National Natural Science Foundation of China (21262032, 21064006 and 21161018)the Natural Science Foundation of Gansu Province (1010RJZA018)the Program for Changjian Scholars and Innovative Research Team in University of Minisry of Education of China (IRT1177)
文摘By applying an indirect strategy, a new copper （II） complex of a thiosemicarbazone L has been successfully developed as a colorimetric cbemosensor for the sensitive detection of mercury （II） ions. In the presence of copper （II） ions, the colorless so- lution of L became yellow; however, upon the addition of traces of mercury （II） ions, the yellow color faded to colorless im- mediately. Other ions, including Fe3＋, Ag＋, Ca2＋, Zn2＋, Pb2＋, Cd2＋, Ni2＋, Co2＋, Cr3＋ and Mg2＋ had a negligible influence on the probe behavior. The detection limits were 5.0×10^-6 M and 3.0×10^-7 M of Hg2＋ using the visual color changes and UV-vis changes respectively. Test strips based on Cu-L were fabricated, which could act as a convenient and efficient Hg2＋ test kits.
