The lower course of the Ebro River is polluted with high concentrations of organochlorine compounds dumped by a chloro-alkali plant during the last century. A remediation plan, including building of a protective wall, removal and disposal of polluted sediments started in 2012. With the aim of assessing the effects of dredging of contaminated sediments and potential alterations of water quality, areas located upstream (RR) and downstream (BE, A) the chemical plant (FL) were monitored prior (October 2012) and during dredging (June 2013) using roach (Rutilus rutilus) as sentinel organisms. Concentrations of organochlorine compounds (OCs) in fish muscle and biliary levels of polycyclic aromatic hydrocarbons (PAHs), galaxolide (HHCB) and alkyphenols (APEs) were determined together with selected enzymatic activities (7-ethoxyresorufin-O-deethylase (EROD), 7-benzyloxy-4-trifluoromethyl-coumarin O-debenzyloxylase (BFCOD) and UDP-glucuronyltransferase (UGT)) in the liver. The obtained results proved the effectiveness of the wall retaining suspended particles and avoiding further contamination of downstream sites as fish sampled at downstream sites showed up to 9-fold higher concentrations of OCs in muscle during wall construction than during dredging. EROD and UGT activities were induced in fish from downstream sites; however, no clear response to the observed pollution gradient was detected.

在上个世纪，埃布罗河下游河段被氯碱工厂倾倒的高浓度有机氯化合物污染。一项修复计划（包括修建防护墙，清除和处置受污染的沉积物）始于2012年。其目的是评估上游（RR）和下游（BE）地区受污染沉积物的疏dr和水质潜在变化的影响。 ，A）之前（2012年10月）和疏during期间（2013年6月）使用蟑螂（Rutilus rut​​ilus）作为前哨生物。测定了鱼肌肉中有机氯化合物（OCs）的浓度以及多环芳烃（PAHs），galaxolide（HHCB）和烷基酚（APEs）的胆汁水平以及所选的酶促活性（7-乙氧基异鲁布芬-O-脱乙基酶（EROD），7 -苄氧基-4-三氟甲基香豆素O-脱苄基羟化酶（BFCOD）和UDP-葡萄糖醛酸基转移酶（UGT））在肝脏中。获得的结果证明了壁保留悬浮颗粒和避免进一步污染下游地点的效果，因为在下游地点取样的鱼显示出在墙壁施工期间肌肉中的OCs浓度比疏ging期间高9倍。在下游部位的鱼类中诱发了EROD和UGT活性。但是，未发现对观察到的污染梯度有明确的响应。