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首页> 外文期刊>Environmental toxicology and chemistry >ASSESSMENT AND CHARACTERIZATION OF POLYCHLORINATED BIPHENYLS NEAR A HAZARDOUS WASTE INCINERATOR: ANALYSIS OF VEGETATION, SNOW, AND SEDIMENTS
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ASSESSMENT AND CHARACTERIZATION OF POLYCHLORINATED BIPHENYLS NEAR A HAZARDOUS WASTE INCINERATOR: ANALYSIS OF VEGETATION, SNOW, AND SEDIMENTS

机译：危险废物焚化炉附近的多氯联苯的评估和鉴定：植被，积雪和沉积物的分析

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Samples of spruce needles, snowpack, and sediment were analyzed in the area around the Alberta Special Waste Treatment Centre (ASWTC) near Swan Hills, Canada, in 1997 and 1998, following a major accidental release of polychlorinated biphenyls (PCBs) and polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs) in October 1996. The PCB concentrations in spruce needles and snow were mostly elevated to the east of the plant and contained congeners that were not present at upwind or distant sites. Several years of annual vegetation monitoring data indicated that PCB emissions increased prior to the reported accident. Within 3 km of the plant, there was a predominance of higher chlorinated congeners penta-, hexa-, hepta-, and octachlorobiphenyls in white spruce (Picea glauca) needles and snow. Polychlorinated biphenyl congener patterns varied seasonally in spruce needles, likely influenced by temperature effects on the volatilization and of particle-bound and vapor phase PCBs in the forest canopy. The similarity of deposition patterns in snow and needles in 1997 and 1998 suggested the PCBs in the surrounding area were derived by long-term fugitive releases of PCBs rather than an accidental release. In addition, hexachlorobenzene, a combustion byproduct of chlorinated organics in waste incinerators, was not measured at elevated concentrations in spruce needles or snow east of the facility and, when detected, was not correlated with PCB concentrations. A radiometrically dated sediment core from nearby Chrystina Lake (AB, Canada) showed a gradual increase in annual PCB flux during the early years of operation of the ASWTC, followed by a higher PCB flux in 1997, indicating that the lake may have been directly contaminated by the accidental release.
机译：在多氯联苯（PCBs）和多氯二苯并（-）-氯甲烷大量意外释放后，于1997年和1998年在加拿大天鹅山附近的艾伯塔省特殊废物处理中心（ASWTC）附近对云杉针，积雪和沉积物进行了分析。对二恶英和呋喃（PCDD / Fs）于1996年10月发布。云杉针叶和积雪中的PCB浓度大多升高至植物的东部，并且含有上风或远处不存在的同类物。几年的年度植被监测数据表明，在报告的事故发生之前，PCB的排放量有所增加。在植物的3公里范围内，白云杉（Picea glauca）针叶和雪中普遍存在较高的氯化同源物五，六，七和八氯联苯。云杉针叶中多氯联苯同源物的类型随季节变化，可能受温度对林冠层挥发以及颗粒结合和气相PCBs的影响。 1997年和1998年在雪和针叶中的沉积模式相似，这表明周边地区的多氯联苯是由多氯联苯的长期逃逸性释放而非偶然性释放引起的。此外，在设施东侧的云杉针头或积雪中，六氯苯（一种废物焚化炉中氯化有机物的燃烧副产物）在升高的浓度下未测出，并且在检测到时与多氯联苯浓度无关。来自附近的克里斯蒂娜湖（加拿大，AB）的放射性测得的沉积物核表明，在ASWTC运营初期，年PCB通量逐渐增加，随后在1997年PCB通量增加，这表明该湖可能已被直接污染。被意外释放。

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