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首页> 外文会议>International symposium on halogenated persistent organic pollutants >RECORDS OF POLYCHLORINATED DIBENZO-P-DIOXINS (PCDD), AND DIBENZO-PFURANS (PCDF) IN SEDIMENT CORE FROM AN URBAN LAKE IN CENTRAL CHILE
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RECORDS OF POLYCHLORINATED DIBENZO-P-DIOXINS (PCDD), AND DIBENZO-PFURANS (PCDF) IN SEDIMENT CORE FROM AN URBAN LAKE IN CENTRAL CHILE

机译：从智利中部城市湖中的沉积物核心中的多氯二苯甲苯-P-二恶英（PCDD）和二苯甲醚（PCDF）的记录

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Dated sediment cores provide an excellent way to investigate the historical input of persistent organic pollutants into the environment and to identify possible sources of pollution. The vertical distribution of Polychlorinated dibenzo-pdioxins (PCDD), and dibenzo-p-furans (PCDF) was investigated in sediment cores from Chica de San Pedro Lake in central Chile to elucidate their historical trend inputs over the last fifty years. Sediment cores were analysed for PCDD/F using HRGC/MS and radioisotopically dated using 210Pb. Organic carbon content (OC) was also measured. Results showed that average PCDD/F (pg g-1 dry weight (d.w.)) concentration was 765 ±551. The percentage of organic carbon was not variable with an average value of 8 ± 1. Analysis of PCDD/F congener composition identified a common pattern of Dioxins. High chlorinated PCDD/F (OCDD and OCDF) were the most abundant congeners, accounting for 70-90% of the total PCDD/Fs composition. Historical deposition patterns indicate a decrease of PCDD/F down the sediment core, with the highest pick detected during 1996 (62 pg cm2 year-1) and 1970 (57). These results are in agreement with the history of industrial activities and other settlements of this Region. Since, the Chica of San Pedro Lake is not directly affected by industrial activities the loading of PCDD/Fs into the lake sediments might be influenced mostly by atmospheric transport and deposition processes. This data are a useful contribution to the knowledge of PCDD/F levels in Chile.
机译：日期沉积物核心提供了研究持续有机污染物进入环境的历史投入，并确定可能的污染源。在智利中部Chica de San Pedro Lake的Chica de San Pedro Lake的沉积物核心中研究了多氯二苯甲基-PdiOxins（PCDD）和Dibenzo-P-Furans（PCDF）的垂直分布，以阐明过去五十年的历史趋势投入。使用HRGC / MS分析PCDD / F的沉积物核心，并使用210pb放射性地曝光。还测量有机碳含量（OC）。结果表明，平均PCDD / F（PG G-1干重（D.W.））浓度为765±551。有机碳的百分比不变，平均值为8±1. PCDD / F同学组合物的分析鉴定了二恶英的常见模式。高氯化PCDD / F（OCDD和OCDF）是最丰富的同机仪，占PCDD / FS组成的70-90％。历史沉积图案表明PCDD / F下降沉积物核心，1996年（62pg CM2岁-1）和1970（57）中检测到的最高挑选。这些结果与工业活动的历史与该地区的其他定居点一致。由于San Pedro湖的奇卡不直接受工业活动影响，将PCDD / FS的装载到湖泊沉积物中可能受到大气运输和沉​​积过程的影响。该数据对智利的PCDD / F级别的知识是有用的贡献。

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