Characterization and comparison of three passive air samplers for persistent organic pollutants
Characterization and comparison of three passive air samplers for persistent organic pollutants
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DOI：
10.1021/es020635t
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发表时间：
2002-10-01
影响因子：
11.4
通讯作者：
Harner, T
中科院分区：
文献类型：
--
作者：
Shoeib, M;Harner, T
研究了三种被动采样介质--半透膜装置、聚氨酯泡沫（PUF）盘和富含有机物的土壤--对持久性有机污染物的累积作用。媒介暴露于受污染的室内空气超过450天，监测空气和媒介中的多氯联苯（PCB）同系物和多氯萘同系物的浓度。吸收最初是线性的，并受采样器的表面积和边界层空气侧传质系数（MTC）。对于SPMD、PUF和土壤，MTC的平均值分别为0.13、0.11和0.26 cm s（-1）。随着研究的进展，在环境空气和被动采样介质之间建立了低分子量多氯联苯同系物的平衡。该信息用于计算被动采样器-空气分配系数KPSM-A。这些与辛醇-空气分配系数相关，由此产生的回归用于预测全套多氯联苯的KPSM-A。MTC，KPSM-A，表面积，和有效厚度的每个采样器的信息被用来估计时间为每种介质的平衡。这些时间从低分子量同系物的几十天到高分子量多氯联苯的几十年不等。表达式也被开发到与被动采样介质累积的化学品的量的平均环境空气浓度在样品的整合期间。
The accumulation of persistent organic pollutants by three passive sampling media-semipermeable membrane devices (SPMDs), polyurethane foam (PUF) disks, and an organic-rich soil-was investigated. The media were exposed to contaminated indoor air over a period of 450 days, and concentrations in the air and in the media were monitored for individual polychlorinated biphenyl (PCB) congeners and polychlorinated naphthalene homologue groups. Uptake was initially linear and governed by the surface area of the sampler and the boundary layer air-side mass transfer coefficient (MTC). Mean values of the MTC were 0.13, 0.11, and 0.26 cm s(-1) for SPMD, PUF, and soil, respectively. As the study progressed, equilibrium was established between ambient air and the passive sampling media for the lower molecular weight PCB congeners. This information was used to calculate passive sampler-air partition coefficients, KPSM-A. These were correlated to the octanol-air partition coefficient, and the resulting regressions were used to predict KPSM-A for the full suite of PCBs. Information on MTC, KPSM-A, surface area, and effective thickness of each sampler was used to estimate times to equilibrium for each medium. These ranged from tens of days for the lower molecular weight congeners to tens of years for the higher molecular weight PCBs. Expressions were also developed to relate the amount of chemical accumulated by the passive sampling media to average ambient air concentrations over the integration period of the sample.