title: [Speciation distribution characters of heavy metals in waste printed circuit boards].
abstract: The environmental availability of heavy metals from the waste printed circuit boards (PCBs) were studied through BCR's three-stage extraction procedures from EU and Tessier's five sequential extraction procedures. The results show that the heavy metal extraction rates with BCR's procedures are higher than that with Tessier's from waste PCBs. There are significant differences in fraction distributions of heavy metals in PCBs. The speciation of Ni in the PCBs exists mainly in residual forms and has little effect on the environment. The percentage of acidic extractable forms with BCR's method and the total amount of exchangeable and carbonate which bound for Tessier's procedure of Pb and Zn are high, in the South China, the two metals are more easily released by acid rain. Acidic extractable forms of Cu is the main speciation in PCBs with BCR's extraction procedures, while the percentage of Fe-Mn oxides- bound of Cu is the highest with Tessier's procedures, though the result is not agree consistent, due to the high content of Cu in PCBs, the harm of Cu from PCBs could not be neglected.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China. njughzhao@yahoo.com.cn
authors.forename: Guo-hua
authors.initials: GH
authors.lastname: Zhao
authors.forename: Xing-zhang
authors.initials: XZ
authors.lastname: Luo
authors.forename: Zhuo-hui
authors.initials: ZH
authors.lastname: Huang
authors.forename: Jing-wei
authors.initials: JW
authors.lastname: Feng
authors.forename: Zheng
authors.initials: Z
authors.lastname: Zheng
authors.forename: Shun-zhi
authors.initials: SZ
authors.lastname: Gao
authors.forename: Er
authors.initials: E
authors.lastname: Nie
authors.forename: Li-xiao
authors.initials: LX
authors.lastname: Ni
mesh_terms: D002681:China; D055615:Electrical Equipment and Supplies; D004581:Electronics; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000032:analysis*; D015386:Hazardous Substances / Q000032:analysis*; D019216:Metals, Heavy / Q000032:analysis*; D012037:Refuse Disposal
chemical_list: D004785:Environmental Pollutants; D015386:Hazardous Substances; D019216:Metals, Heavy