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首页> 外文期刊>Environmental toxicology and chemistry >Determination Of In Situ Polychlorinated Biphenyl Elimination Ratecoefficients In The Freshwater Mussel Biomonitor Elliptio Complanata Deployed In The Huron-erie Corridor, Southeast Michigan, Usa, And Southwest Ontario, Canada
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Determination Of In Situ Polychlorinated Biphenyl Elimination Ratecoefficients In The Freshwater Mussel Biomonitor Elliptio Complanata Deployed In The Huron-erie Corridor, Southeast Michigan, Usa, And Southwest Ontario, Canada

机译：在加拿大，密歇根州东南部和美国西南安大略省休伦堡走廊部署的淡水贻贝生物监测器Elliptio Complanata中原位多氯联苯消除率的测定

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Quantitative mussel biomonitoring studies often use laboratory-measured whole-body elimination rate coefficients (k_(tot)) in conjunction with concentration data from field-deployed mussels to estimate bioavailable steady-state contaminant concentrations (C_(m(ss)_) in aquatic systems. However, the validity of applying laboratory k_(tot) values to field-deployed mussels has not been verified. The present study quantified in situ k_(tot) values by the common mussel biomonitor species Elliptio complanata for a group of performance reference compound polychlorinated biphenyl (PCB) congeners (International Union of Pure and Applied Chemistry 23, 61, 109, and 173) at 11 sites along the Lake Huron-Lake Erie corridor (southeast MI, USA, and southwest ON, Canada). Predictive site-specific k_(tot) versus log K_(ow) relationships were derived to estimate in situ k_(tot) values for the bioaccumulated environmental PCB congeners, and the resultant steady-state concentration estimates were compared against values estimated using laboratory-derived k_(tot) values. In situ k_(tot) values were almost always faster (1.3-10-fold) than rate coefficients determined by laboratory studies, with a mean difference ± standard error of 3.89 ± 0.28-fold. Consequently, control adjusted steady-state concentrations of sum PCBs in the mussels were overestimated by factors ranging from 1.30 to 3.45 across sites when using laboratory-derived k_(tot) values in place of in situ k_(tot) values and a field deployment period of 90 d. This error was shown to increase with increasing congener hydrophobicity, as represented by their log K_(ow) values, and when shorter field deployment times are performed. To more accurately predict the steady-state concentrations of environmentally accumulated PCBs in mussels, it is recommended that future quantitative biomonitoring studies employ the reference compound approach for measuring site-specific in situ k_(tot) values.
机译：贻贝的定量生物监测研究通常结合实验室测量的全身消除率系数（k_（tot））和现场部署的贻贝的浓度数据来估算水生生物的稳态污染物浓度（C_（m（ss）_）然而，尚未验证将实验室k_（tot）值应用于野外部署的贻贝的有效性。本研究通过常见贻贝生物监测物种Elliptio complanata对一组性能参考化合物的原位k_（tot）值进行了量化。多氯联苯（PCB）同类物（国际纯粹与应用化学联合会23、61、109和173）位于休伦湖伊利湖走廊（美国密歇根州东南部和加拿大西南安大略省）沿线的11个站点。得出特定的k_（tot）与log K_（ow）关系，以估算生物积累的环境PCB同类物的原位k_（tot）值，并比较所得的稳态浓度估算值使用实验室得出的k_（tot）值估算的值。原位k_（tot）值几乎总是比实验室研究确定的速率系数快（1.3-10-倍），平均差±标准误差为3.89±0.28倍。因此，当使用实验室得出的k_（tot）值代替原位k_（tot）值和现场部署期间时，跨地点的调节调整后稳态贻贝中总PCB的浓度被高估了1.30至3.45。 90 d。如其对数K_（ow）值所表示的，并且当执行较短的现场部署时间时，该误差显示为随着同类疏水性的增加而增加。为了更准确地预测贻贝中环境累积的多氯联苯的稳态浓度，建议未来的定量生物监测研究采用参考化合物方法来测量特定地点的原位k_（tot）值。

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