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首页> 外文期刊>Environmental Science & Technology >Room-to-Room Variability of Airborne Polychlorinated Biphenyls in Schools and the Application of Air Sampling for Targeted Source Evaluation
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Room-to-Room Variability of Airborne Polychlorinated Biphenyls in Schools and the Application of Air Sampling for Targeted Source Evaluation

机译：学校空中多氯联苯的室内可变性及空气采样应用源评估

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摘要

Airborne polychlorinated biphenyl (PCB) concentrations are higher indoors than outdoors due to their historical use in building materials and their presence in modern paints and surface treatments. For some populations, including school children, PCB levels indoors result in inhalation exposures that may be greater than or equivalent to exposure through diet. In a school, PCB exposure may come from multiple sources. We hypothesized that there are both Aroclor and non-Aroclor sources within a single school and that PCB concentration and congener profiles differ among rooms within a single building. To evaluate this hypothesis and to identify potential localized sources, we measured airborne PCBs in nine rooms in a school. We found that schoolroom concentrations exceed outdoor air concentrations. Schoolroom concentrations and congener profiles also varied from one room to another. The concentrations were highest in the math room (35.75 ng m~(-3) ± 8.08) and lowest in the practice gym (1.54 ng m~(-3) ± 0.35). Rooms in the oldest wing of the building, originally constructed between 1920 and 1970, had the highest concentrations. The congener distribution patterns indicate historic use of Aroclor 1254 as well as modern sources of non-Aroclor congeners associated with paint pigments and surface coatings. Our findings suggest this noninvasive source identification method presents an opportunity for targeted source testing for more cost-effective prioritization of materials remediation in schools.
机译：由于其在建筑材料和现代涂料和表面处理中的历史上使用，空气传播的多氯联苯（PCB）浓度高于户外户外。对于一些人群，包括学校儿童，在室内的PCB水平导致吸入暴露可能大于或等同于通过饮食暴露。在学校，PCB曝光可能来自多个来源。我们假设一所学校内有Aroclor和非煤气源，并且PCB浓度和Congener曲线在单一建筑物内的房间内不同。为了评估这一假设并识别潜在的局部来源，我们在学校的九个房间中测量了空气传播的PCB。我们发现教室浓度超过室外空气浓度。教室浓度和Congener曲线也从一个房间变为另一个房间。数学室中的浓度最高（35.75 ng m〜（-3）±8.08），在实践健身房最低（1.54 ng m〜（-3）±0.35）。建筑物最古老的房间，最初在1920年至1970年间建造，浓度最高。 Congener分布模式表明Aroclor 1254的历史利用以及与涂料颜料和表面涂层相关的非芳烃基因器的现代来源。我们的研究结果表明，这种无创源识别方法为有针对性的来源测试提供了有针对性的来源测试的机会，以便在学校进行更具成本效益的材料优先顺序。

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