Levels of Extractable Organohalogens in Pine Needles in China
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- 作者：Diandou Xu ; Weike Zhong ; Linlin Deng ; Zhifang Chai ; and Xueying Mao
- 刊名：Environmental Science & Technology
- 出版年：2003
- 出版时间：January 1, 2003
- 年：2003
- 卷：37
- 期：1
- 页码：1 - 6
- 全文大小：119K
- 年卷期：v.37,no.1(January 1, 2003)
- ISSN：1520-5851
文摘
Pine needles can accumulate organohalogens from theambient air, which are, hence, able to serve as a biomonitorto evaluate the levels of organochlorinated contaminantsin the atmospheric environment. Extractable organochlorine(EOCl), the most abundant of the extractable organohalogens(EOX) in environmental samples, has received muchattention as a parameter for evaluation of total contaminationlevels of organochlorinated compounds (OCs). However,few data concerning EOCl in vegetation are available. In thisstudy, we selected pine needles from 17 different areasin China as a sampling matrix to reflect the regional distributionof OCs. EOX (EOX = EOCl + EOBr + EOI) were measuredby instrument neutron activation analysis for theirconcentrations and distribution in pine needles. Theconcentrations of EOX were on the order of EOCl 
EOBr> EOI. About 5-38% of EOCl remained as sulfuric acid-resistant organochlrine (EPOCl). The relatively highconcentrations of EPOCl in pine needles from remoteareas suggested that EPOCl mainly originated from long-range atmospheric transport and contaminated soil.The relative proportions of the known organochlorines(such as HCHs, DDTs, aldrin, heptachlor, and chlordanes)to total EOCl and EPOCl were 0.3-5.2% and 1.4-19.8%,respectively, which implied that a major portion of the EPOClmeasured in pine needles was unknown. The EPOXaccumulation rates were preliminarily estimated underthe natural condition, which suggested that the "young"needle accumulated EPOX more quickly than the "old" andmore than 94% of EPOX was accumulated at the firstyear of pine needles.
EOBr> EOI. About 5-38% of EOCl remained as sulfuric acid-resistant organochlrine (EPOCl). The relatively highconcentrations of EPOCl in pine needles from remoteareas suggested that EPOCl mainly originated from long-range atmospheric transport and contaminated soil.The relative proportions of the known organochlorines(such as HCHs, DDTs, aldrin, heptachlor, and chlordanes)to total EOCl and EPOCl were 0.3-5.2% and 1.4-19.8%,respectively, which implied that a major portion of the EPOClmeasured in pine needles was unknown. The EPOXaccumulation rates were preliminarily estimated underthe natural condition, which suggested that the "young"needle accumulated EPOX more quickly than the "old" andmore than 94% of EPOX was accumulated at the firstyear of pine needles.