The information about concentrations of dioxin in pore water, ecotoxicity and DOC and TOC content can be key factor for the prediction of the fate of dioxins in the aquatic environment as well as an ecological risk assessment. The aims of the study were to assess the concentration of PCDDs/PCDFs and ecotoxicity of pore water and to compare above results in relation to the dissolved organic carbon (DOC) and total organic carbon (TOC) content. The concentration of dioxins was assessed using an enzyme-linked immunoassay test, while the ecotoxicity of pore water was determined using a crustacean Daphnia magna and bacteria Aliivibrio fischeri. The studies were conducted on two different dammed reservoirs Rożnów (catchment basin of an agricultural character) and Rybnik (catchment basin of an industrial character) located in southern Poland. The concentration of dioxins in pore water was between 8.56 to 90.92 ng EQ/L, with a significantly higher concentration in the pore water from the Rożnów Reservoir than the Rybnik Reservoir. The DOC content in pore water was from 30.29 to 63.02 mg/L (Rożnów Reservoir) and from 35.46 to 60.53 mg/L (Rybnik Reservoir). Higher toxic responses were recorded for A. fischeri than for D. magna. Moreover a significantly higher toxicity for both tested organisms was indicated in pore water from the Rożnów Reservoir. Besides of TOC and DOC, the fine fractions of the sediments were particularly important in the concentration of dioxin in pore water. The other pore water parameters, such as pH and EC can influence the toxicity of water for organisms. The result indicate complex relationships between the PCDD/F, ecotoxicity and DOC, TOC concentration in pore water and confirms that these parameters are important in terms of water environmental contamination.

有关孔隙水中二恶英浓度，生态毒性以及DOC和TOC含量的信息可能是预测水生环境中二恶英命运以及进行生态风险评估的关键因素。该研究的目的是评估PCDDs / PCDF的浓度和孔隙水的生态毒性，并比较上述结果与溶解有机碳（DOC）和总有机碳（TOC）含量的关系。使用酶联免疫测定法评估二恶英的浓度，同时使用甲壳类水蚤（Daphnia magna）和细菌Aliivibrio fischeri测定孔隙水的生态毒性。。这项研究是在波兰南部的两个不同的堰塞水库Rożnów（具有农业特征的集水盆地）和Rybnik（具有工业特征的集水盆地）上进行的。孔隙水中二恶英的浓度在8.56至90.92 ng EQ / L之间，Rożnów水库的孔隙水中的浓度明显高于Rybnik水库。孔隙水中的DOC含量为30.29至63.02 mg / L（罗诺夫水库）和35.46至60.53 mg / L（雷布尼克水库）。记录到费氏曲霉的毒性反应比麦格氏菌更高。。此外，在Rożnów水库的孔隙水中还显示出对两种被测生物均具有明显更高的毒性。除了TOC和DOC外，沉淀物中的细小部分对于孔隙水中二恶英的浓度也特别重要。其他孔隙水参数（例如pH和EC）会影响水对生物的毒性。结果表明孔隙水中PCDD / F，生态毒性与DOC，TOC浓度之间存在复杂的关系，并证实这些参数对于水环境污染而言非常重要。