Polychlorinated biphenyls in nonaccumulating, century-old sediments: sources, signatures, and mechanism of introduction.
Polychlorinated biphenyls in nonaccumulating, century-old sediments: sources, signatures, and mechanism of introduction.
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非积累性百年沉积物中的多氯联苯：来源、特征和引入机制。
DOI：
10.1021/es010593t
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发表时间：
2001
影响因子：
11.4
通讯作者：
W. Ramírez
中科院分区：
文献类型：
--
作者：
J. Chiarenzelli;C. Alexander;A. Isley;R. Scrudato;J. Pagano;W. Ramírez
本研究记录了100多年前沉积的河流沉积物中高氯化多氯联苯同系物的存在情况。在安大略的一个小型农村支流的核心样本中发现了浓度高达78.8纳克/克（干重）的五氯至七氯同系物（> 80%）。低氯同系物和其他有机氯化合物偶尔出现;缺乏210 Pb和137 Cs。最合理的机制是溶解相多氯联苯在渗透性沉积物邻近的小溪通道的积累。在流域采集的岩芯和空气样本之间的相似性表明，多氯联苯同系物来自大气中残留的一部分。
This study documents the occurrence of highly chlorinated PCB congeners in stream sediment deposited over 100 years ago. Penta- to heptachlorinated congeners (> 80%) have been found at concentrations up to 78.8 ng/g (dw) in core samples of a small, rural tributary of Lake Ontario. Lower chlorinated congeners and other organochlorine compounds occur sporadically; 210Pb and 137Cs are lacking. The most plausible mechanism is accumulation of dissolved-phase PCBs in permeable sediments adjacent to the creek channel. The similarity between core and air samples collected in the drainage basin suggests derivation from a residual fraction of atmospherically derived PCB congeners.