Thirty-one congeners of polychlorinated naphthalenes (PCNs) and 21 congeners of polybrominated diphenylethers(PBDEs)in surface sediments at 5 stations and one mussel sample from Qingdao coastal waters were analyzed. T...Thirty-one congeners of polychlorinated naphthalenes (PCNs) and 21 congeners of polybrominated diphenylethers(PBDEs)in surface sediments at 5 stations and one mussel sample from Qingdao coastal waters were analyzed. The maximum contents occur at the station near the Haibo River mouth. The total PCNs contents are in the range of 212-1209 pg/g dw, dominated by tri-Cl CN. The total PBDEs contents are in the range of 117-5510 pg/g dw,dominated by tri- to hexa-BrBDEs. The local sources of PCNs are likely from combustion processes such as incinerations and coal burnings. The sources of PBDEs are molecular diffusion from the materials containing them. Except for the area near the river mouth where is affected by the sewage sludges, an important source of PCNs and PBDEs in this area is believed to be the atmospheric deposition. Mussels enrich PCNs and PBDEs relative to the sediments. The total TEQs of PCNs in mussels are lower than the total TEQs of PCBs.展开更多
The concentrations and distribution of polychlorinated naphthalenes（PCNs） in the whole blood of eight typical terrestrial meat animals（chicken, duck, rabbit, pig, cattle, sheep,horse and donkey） consumed daily in ...The concentrations and distribution of polychlorinated naphthalenes（PCNs） in the whole blood of eight typical terrestrial meat animals（chicken, duck, rabbit, pig, cattle, sheep,horse and donkey） consumed daily in our life were investigated. The total concentrations（on a liquid volume basis） of PCNs were in a range from 305 to 987 pg/L. Donkey blood contained the highest PCN concentrations. Mono-CNs were the dominant homolog group,accounting for 38%–71% PCNs. Apart from the mono-CNs and tri-CNs homolog groups, two hepta-CNs（mean： 9.5%） contributed most, followed by tetra-CNs（mean： 6.5%）. The congeners CN1, 5/7, 24/14, 27/30, 52/60, 66/67, and 73 were the most abundant congeners or congener groups. The highest toxicity equivalencies（TEQs） were observed in cattle blood（117.4 fg TEQ/L） then chicken blood（117.1 fg TEQ/L）. CN73 contributed 65% to total TEQs,followed by CN70（20%） and CN66/67（14%）. The dietary intakes of PCNs were also estimated.Chicken meat, which forms the second largest component of meat product consumption in China, contributed most to the total TEQs（61%）, followed by beef（27%） and pork（5.9%）. The consumption of chicken might pose the highest risk from exposure to PCNs than other types of meat to populations who prefer to eat chicken meat.展开更多
The concentrations and congener profiles of poly- chlorinated naphthalenes （PCNs） in surface sediment samples collected from the Yangtze and Yellow River Estuaries were inves- tigated. PCN congeners （from MoCNs to ...The concentrations and congener profiles of poly- chlorinated naphthalenes （PCNs） in surface sediment samples collected from the Yangtze and Yellow River Estuaries were inves- tigated. PCN congeners （from MoCNs to OCN） were determined by isotope dilution/high-resolution gas chromatography/high- resolution mass spectrometry （HRGC-HRMS）. The total concen- trations of PCNs were 34.3-303.0 pg/g （dry weight, dw） in the Yangtze Estuary samples and 6.2-408.0 pg/g （dw） in the Yellow River Estuary samples, which were lower compared with that in other sediments reported by previous studies. In addition, the re- markably different homologue or congener profiles of PCNs have been obtained in this study. Samples dominated with MoCNs to TrCNs might be attributed to atmospheric deposition and global fractionation, while in other samples taken from the surrounding industrial areas the enrichment of higher chlorinated homologues suggested that the industrial and human activities should be the main potential sources.展开更多
文摘Thirty-one congeners of polychlorinated naphthalenes (PCNs) and 21 congeners of polybrominated diphenylethers(PBDEs)in surface sediments at 5 stations and one mussel sample from Qingdao coastal waters were analyzed. The maximum contents occur at the station near the Haibo River mouth. The total PCNs contents are in the range of 212-1209 pg/g dw, dominated by tri-Cl CN. The total PBDEs contents are in the range of 117-5510 pg/g dw,dominated by tri- to hexa-BrBDEs. The local sources of PCNs are likely from combustion processes such as incinerations and coal burnings. The sources of PBDEs are molecular diffusion from the materials containing them. Except for the area near the river mouth where is affected by the sewage sludges, an important source of PCNs and PBDEs in this area is believed to be the atmospheric deposition. Mussels enrich PCNs and PBDEs relative to the sediments. The total TEQs of PCNs in mussels are lower than the total TEQs of PCBs.
基金supported by the Chinese Academy of Sciences“Strategic Leading Science and Technology Projects”(No.XDB14020000)the National Natural Science Foundation of China(Nos.21677169,21477150,21621064,and 21577148)
文摘The concentrations and distribution of polychlorinated naphthalenes（PCNs） in the whole blood of eight typical terrestrial meat animals（chicken, duck, rabbit, pig, cattle, sheep,horse and donkey） consumed daily in our life were investigated. The total concentrations（on a liquid volume basis） of PCNs were in a range from 305 to 987 pg/L. Donkey blood contained the highest PCN concentrations. Mono-CNs were the dominant homolog group,accounting for 38%–71% PCNs. Apart from the mono-CNs and tri-CNs homolog groups, two hepta-CNs（mean： 9.5%） contributed most, followed by tetra-CNs（mean： 6.5%）. The congeners CN1, 5/7, 24/14, 27/30, 52/60, 66/67, and 73 were the most abundant congeners or congener groups. The highest toxicity equivalencies（TEQs） were observed in cattle blood（117.4 fg TEQ/L） then chicken blood（117.1 fg TEQ/L）. CN73 contributed 65% to total TEQs,followed by CN70（20%） and CN66/67（14%）. The dietary intakes of PCNs were also estimated.Chicken meat, which forms the second largest component of meat product consumption in China, contributed most to the total TEQs（61%）, followed by beef（27%） and pork（5.9%）. The consumption of chicken might pose the highest risk from exposure to PCNs than other types of meat to populations who prefer to eat chicken meat.
基金Supported by the National Natural Science Foundation of China(20677070, 20621703)
文摘The concentrations and congener profiles of poly- chlorinated naphthalenes （PCNs） in surface sediment samples collected from the Yangtze and Yellow River Estuaries were inves- tigated. PCN congeners （from MoCNs to OCN） were determined by isotope dilution/high-resolution gas chromatography/high- resolution mass spectrometry （HRGC-HRMS）. The total concen- trations of PCNs were 34.3-303.0 pg/g （dry weight, dw） in the Yangtze Estuary samples and 6.2-408.0 pg/g （dw） in the Yellow River Estuary samples, which were lower compared with that in other sediments reported by previous studies. In addition, the re- markably different homologue or congener profiles of PCNs have been obtained in this study. Samples dominated with MoCNs to TrCNs might be attributed to atmospheric deposition and global fractionation, while in other samples taken from the surrounding industrial areas the enrichment of higher chlorinated homologues suggested that the industrial and human activities should be the main potential sources.
