Polychlorinated dibenzo-p-dioxin and dibenzofurans (PCDD/Fs), polybrominated diphenyl ethers (PBDEs), and polychlorinated biphenyls (PCBs) monitored by tree bark in an E-waste recycling area

To investigate the environmental levels and profiles of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), polybrominated diphenyl ethers (PBDEs), and polychlorinated biphenyls (PCBs), tree bark samples (n = 22) were collected from Luqiao, an E-waste recycling area, in east China in July 11-13, 2006. The average concentrations of PCDD/Fs, PBDEs, and PCBs determined by isotope dilution-high resolution gas chromatography (HRGC) coupled with high resolution mass spectrometer (HRMS) were 0.1 +/- 0.0, 1.4 +/- 0.2, and 6.5 +/- 0.8 lg g (1) lipid weight, respectively. PCDD/F-toxic equivalent (TEQ, WHO-1998), PCB-TEQs, and total dioxin-like TEQs were 1.3 +/- 0.1, 0.5 +/- 0.0, and 1.8 +/- 0.2 ng g (1) lipid weight, respectively. The profiles of these pollutants in the tree bark were also discussed. Tetra-CDFs, deca-BDE and tri-CBs were the main homologues and accounted for 47% of total PCDD/Fs, 79.3% of total PBDEs, and 33.2% of total PCBs, respectively; As for TEQs, 2,3,4,7,8-PeCDF and PCB126 were the main contributors and accounted for 36% of the total PCDD/F-TEQs and 81.2% of the total PCB-TEQs, respectively. High accumulation of PCDD/Fs, PBDEs, and PCBs detected in the tree bark indicated heavy contaminations of these pollutants in Luqiao area. (C) 2008 Elsevier Ltd. All rights reserved.

Cleanup and quantification of polychlorinated dibenzo-p-dioxins/furans and polychlorinated biphenyls

By using modern techniques of isotope dilution, high-resolution gas chromatography/high-resolution mass spectrometry and multiple ions detection, an effective cleanup, qualitative and quantitative method was developed for polychlorinated dibenzo-p-dioxins/furans (PCDD/F) and polychlorinated biphenyls analysis. Based on the chromatographic relative retentions of PCDD/F, a software was established for automatic peak recognition of all the isomers from tetra- to octachlorine PCDD/F. It ensured good reliability and accuracy of the analytical data.

胶东昆嵛山复式花岗岩体的演化—岩石学和锆石U-Pb年代学研究

Kunyushan composite granite pluton is located in northeast part of the Sulu UHP collisional belt, Jiaodong peninsula, eastern China. It is regarded as the boundary of the Jiaodong block and the Sulu UHP collisional belt. The body is unique in the Dabieshan-Sulu UHP collisional orogen for its feature of multiple intrusions of diverse types granitoid rocks in a long span after UHP the collision between the North China and the Yangtze plates in late Triassic. It can be grouped into four series on the basis of petrology and petrochemistry. They are mid-K calc-alkaline granitoids, strongly peraluminous granites, high-K calc-alkaline granitoids and syenitic granite of shoshonitic series. In this thesis, the later three types of rocks are investigated geochronologically in detail. The grain zircon U-Pb isotope dilution dating technique has been employed in this study. Zircon morphology are presented and discussion on the chemical and physical conditions of the granite formation have been carried out in addtion. Strongly peraluminous granites comprises foliated monzogranite and garnet bearing leucogranite. They occupy more than half of the area of the Kunyushan composite body. Three zircon samples of foliated monzogranites have been analyzed, they yield lower intercept ages mainly in the range of 140-150 Ma. The formation of these rocks was likely to be at 700-600 ℃, implied by zircon morphology. Two zircon samples of the garnet bearing leucogranite yield lower intercept ages from 130 Ma to 140 Ma. Zircon morphology indicate that the liquidus temperature of the magma was about 750 °C. Syenitic granite of shoshonitic series occur in the north central part of the body, and the volume is quite small contrast to other types. One zircon sample was chosen from this rock, and yield lower intercept age of 121+1.8/-2.1 Ma. Zircon morphology indicate that the liquidus temperature of this rock is up to 900 °C, which is much higher than others'. High-K calc-alkaline granitoids can be divided into two types on the basis of rock texture and structure. One is Kf-porphyritic monzogranite. It's outcrop is quite small. Zircon ages of one sample constrain the emplacement of this rock at about 112 Ma. The other is medium-grain to coarse-grain monzogranite. Zircons from it yield lower intercept age of 100.5+2.9/-4.6 Ma. The variation of zircon morphology suggest that these two monzogranites were outcomes of a single magma at different stage. The former emplaced earlier than the latter. The liquidus temperature of the magma was about 800 ℃ Inherited zircon is ubiquitous in the Kunyushan composite body. Most of the samples yield upper intercept ages of late Proterozoic. It was considered that only the Yangtze plate underwent a crustal growth during late Proterozoic among the two plates which involved into the UHP collision. Inherited zircon of about 200 Ma can also be observed in strongly peraluminous and high-K calc-alkaline granitoids. Two samples out of eight yield upper intercept ages of Achaean.