Exposure Pathways of Polychlorinated Biphenyls in Er-Jn River and Activities in Environmental Media Measured with Solid Phase Microextraction
Date Issued
2004
Date
2004
Author(s)
Hsieh, Ming-Kai
DOI
zh-TW
Abstract
Researches have shown high concentration of polychlorinated biphenyls (PCBs) in sediment and fish in Er-Jen River. The exposure pathways of PCBs are forward human bodies of concern. Infact, activity in each environmental phase governs PCBs’ migration directions. Understanding the activity of each compartment in the estuary, including sediment, water, and fish, is important for assessing the potential health risk residing near Er-Jen River. This study is aimed to establish a solid phase microextraction (SPME) method to measure the activities of PCBs in environmental media by using polydimethylsiloxan (PDMS) coated optical fibers. Partition coefficients of PDMS to water and organic matter to water (Kpw and Kom), and bioconcentration factor (BCFL) could be determined more accurately in this study with less artifacts and were compared with those from the literatures.
Without the interference of adsorption on glass wall, logKpw obtained from this study shows a linear relationship with logKow (logKpw = 0.89logKow + 0.36, R2 = 0.92) even for PCBs with high chlorine number. The lower Kpw value from literatures might be due to neglecting the effect of glass wall’s adsorption.
logKom increases linearly with logKow (logKom = 1.17logKow – 1.03, R2 = 0.86), however, is higher than the logKom reported in the literature. LogBCFL ranges from 5.88 to 8.53 and also has a linear relationship with logKow (logBCFL = 1.07logKow + 0.30, R2 = 0.77), while some literatures says logBCFL becomes nonlinear with logKow as logKow > 6 and even decreases as logKow > 7.5. These discrepancies might be resulted from overestimating the nature water’s concentration and underestimating BCFL, especially for substances with higher logKow values possibly, due to the nonseparable sorbing compartments in the aqueous phases.
PCBs’ activities in fish, water, and surface sediment showed that they were about in equilibrium state. Pollutants were going from deeper sediment to surface layer sediment, fish, and finally uptaken by human. Estimated life time cancer risk of a resident in the estuary area is 3.4 10-6 and hazard quotient is 0.40.
Subjects
PDMS-水平衡分配常數
固相微量萃取
生物濃縮因子
聚二甲基矽氧烷
有機質-水平衡分配常數
活性
暴露途徑
多氯聯苯
acitivity
bioconcentration factor (BCF)
exposure pathway
solid phase microextraction (SPME)
organic matter to water partition coefficient
polychlorinated biphenyls (PCBs)
SDGs
Type
thesis
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