Homologue and isomer distribution of dioxins observed in water samples collected from Kahokugata Lagoon and inflowing rivers, Japan
Homologue and isomer distribution of dioxins observed in water samples collected from Kahokugata Lagoon and inflowing rivers, Japan
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DOI：
10.1016/j.watres.2006.02.039
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发表时间：
2006-06-01
期刊：
影响因子：
12.8
通讯作者：
Hayakawa, Kazuichi
中科院分区：
文献类型：
--
作者：
Kakimoto, Hitoshi;Oka, Hideo;Hayakawa, Kazuichi
在Kahokugata水流域（日本中部的一个封闭水流域）的17个地点采集了水样。我们测定了水样中二恶英的浓度。在Kahokugata泻湖和流入泻湖的河流中，二恶英的毒性当量（TEQ）浓度和悬浮固体（SS）浓度之间的线性关系。多氯二苯并对二恶英（PCDDs）和二苯并呋喃（PCDFs）的同系物组成表明，所有水样仍受到稻田中广泛使用的氯硝草醚（CNP）和五氯苯酚（PCP）等氯代除草剂的强烈影响。多氯二苯并对二恶英同系物的主要异构体分布在采样点之间没有显著差异，而多氯二苯并呋喃同系物的主要异构体分布在采样点之间差异很大。在其中一条河流下游的几个采样点，发现高浓度的1，3，6，7，8-五氯二苯并呋喃（1，3，6，7，8-PeCDF）及其相关异构体（1，3，6，8-氯取代的多氯二苯并呋喃）来自一家染料制造厂。这些无毒的异构体通常只是环境水样中的次要成分，并不是任何已知二恶英来源的指示剂。染料排放仅在工厂附近采集的水样中有贡献，其贡献的季节变化可能取决于河流的流速。(c)2006爱思唯尔有限公司保留所有权利。
Water samples were collected at 17 sites in Kahokugata Water Basin, a closed water basin in central Japan. We determined the concentration of dioxins of the water samples. Linear relationships between toxic equivalent (TEQ) concentrations of dioxin and concentrations of suspended solid (SS) were obtained at sites in Kahokugata Lagoon and in the rivers flowing into the lagoon. Homologue composition of polychlorinated dibenzo-p- dioxins (PCDDs) and dibenzofurans (PCDFs) indicated that all the water samples were still strongly influenced by chlorinated herbicides, such as chloronitrofen (CNP) and pentachlorophenol (PCP) that had been widely used in rice fields. The main isomer distributions of the PCDD homologues were not significantly different among the sampling sites, while the main isomer distributions of the PCDF homologues were considerably different among the sampling sites. At a few sampling points in the downstream part of one of the rivers, high concentrations of 1,3,6,7,8-pentachloro dibenzofuran (1,3,6,7,8-PeCDF) and its related isomers (1, 3,6,8-chlorine-substituted PCDFs) were traced to a dye manufacturing plant. These non-toxic isomers are usually only minor constituents in environmental water samples and are not indicators of any known dioxin sources. The dyeing discharge was found to make a contribution only in the water samples collected near the plant and the seasonal variation of the contribution might depend on the flow rate of the river. (c) 2006 Elsevier Ltd. All rights reserved.