Objective:PCDD/Fs level in 22 fish samples was investigated in Pearl river Delta area in order thatthe PCDD/Fs pollution level in common fish can be evaluated.Methods:Dibenzo-p-Dioxins andDibenzo-Furans was extracted ...Objective:PCDD/Fs level in 22 fish samples was investigated in Pearl river Delta area in order thatthe PCDD/Fs pollution level in common fish can be evaluated.Methods:Dibenzo-p-Dioxins andDibenzo-Furans was extracted from the sample by Soxhlet extraction,concentrated then purified by columnchromatography,carbon column enrichment,.Confirmation and quantitative analysis at ppt(pg/g) level ofPCDD/Fs was performed by HRGC/HRMS using multiple ion detection mode(MID).Certified referencematerial using Proficiency test sample——fish muscle test material 0613 that was obtained from CentralScience Laboratory(CSL) in Britain.Results:The average of concentration in wet weight is 1.261 ng/kg,,theaverage total WHO-TEQ for 22 samples is 0.246ng/kg wet weight.Generally,OCDD,2,3,7,8-TCDF,1,2,3,4,6,7,8-HpCDD was the main contributors to the total 17 PCDD/Fs detected,average account for21%,16%,14%,respectively.While 1,2,3,7,8-PeCDD,2,3,4,7,8-PeCDF,2,3,7,8-TCDD were main contributorsto the total WHO-TEQ,account for 40%,27%,13% respectively.The total TEQ for 22 fishes ranged from 0.03ng/kg wet weight to 0.878 ng/kg wet weight.Conclusions:PCDD/Fs level was largely different from sample tosample depending on the sample kinds.The level in the Pearl river Delta area fish samples is not distinctcomparing with other countries,but some kind fish level should be paid more attention on it since its higherlevel.The relationship between source of PCDD/Fs and PCDD/Fs level in fish will be studied deeply in thefuture.展开更多
The title complex is of triclinic system space group P1 with its cell parameters: a = 9. 386(1), b = 9. 412(2), c=11. 549(2)(?), α=97. 91(2), β = 81.70(1), γ= 102. 63(1)°, V= 979.2(?)3, Z = l, Mr = 966. 01, Dx...The title complex is of triclinic system space group P1 with its cell parameters: a = 9. 386(1), b = 9. 412(2), c=11. 549(2)(?), α=97. 91(2), β = 81.70(1), γ= 102. 63(1)°, V= 979.2(?)3, Z = l, Mr = 966. 01, Dx =1. 638 gcm-3, μ(MoKα) = 16. 896cm-1, F (000) = 478, final R = 0. 033 and Rw = 0. 046 for 3424 reflections with I≥3σ(I). The two O atoms of the ligand are bonded to two Sn atoms to form a bridged binuclear species which lies on the crystallographic centre of symmetry situated at the centre of the ethylene C -C bond. The unique Sn atom exhibits a trigonalbipyramidal geometry.展开更多
文摘Objective:PCDD/Fs level in 22 fish samples was investigated in Pearl river Delta area in order thatthe PCDD/Fs pollution level in common fish can be evaluated.Methods:Dibenzo-p-Dioxins andDibenzo-Furans was extracted from the sample by Soxhlet extraction,concentrated then purified by columnchromatography,carbon column enrichment,.Confirmation and quantitative analysis at ppt(pg/g) level ofPCDD/Fs was performed by HRGC/HRMS using multiple ion detection mode(MID).Certified referencematerial using Proficiency test sample——fish muscle test material 0613 that was obtained from CentralScience Laboratory(CSL) in Britain.Results:The average of concentration in wet weight is 1.261 ng/kg,,theaverage total WHO-TEQ for 22 samples is 0.246ng/kg wet weight.Generally,OCDD,2,3,7,8-TCDF,1,2,3,4,6,7,8-HpCDD was the main contributors to the total 17 PCDD/Fs detected,average account for21%,16%,14%,respectively.While 1,2,3,7,8-PeCDD,2,3,4,7,8-PeCDF,2,3,7,8-TCDD were main contributorsto the total WHO-TEQ,account for 40%,27%,13% respectively.The total TEQ for 22 fishes ranged from 0.03ng/kg wet weight to 0.878 ng/kg wet weight.Conclusions:PCDD/Fs level was largely different from sample tosample depending on the sample kinds.The level in the Pearl river Delta area fish samples is not distinctcomparing with other countries,but some kind fish level should be paid more attention on it since its higherlevel.The relationship between source of PCDD/Fs and PCDD/Fs level in fish will be studied deeply in thefuture.
基金Project supported by the National Foundation of Natural Sciences.
文摘The title complex is of triclinic system space group P1 with its cell parameters: a = 9. 386(1), b = 9. 412(2), c=11. 549(2)(?), α=97. 91(2), β = 81.70(1), γ= 102. 63(1)°, V= 979.2(?)3, Z = l, Mr = 966. 01, Dx =1. 638 gcm-3, μ(MoKα) = 16. 896cm-1, F (000) = 478, final R = 0. 033 and Rw = 0. 046 for 3424 reflections with I≥3σ(I). The two O atoms of the ligand are bonded to two Sn atoms to form a bridged binuclear species which lies on the crystallographic centre of symmetry situated at the centre of the ethylene C -C bond. The unique Sn atom exhibits a trigonalbipyramidal geometry.
