According to the water framework directive (WFD), the chemical status should be determined for each water body in a basin through monitoring and evaluation studies, and the gap between the status of water bodies and good water status should be revealed in river basin management plans. In this context, the methodology starting with the evaluation of the monitoring results of the priority substances (PSs) until the end of determining the measures to achieve good condition in surface waters was given in this study. The key aim was to provide a useful methodology defined as a matrix for determining the sources of pollutants that caused this gap. This matrix was applied to the most polluted sub-basin of Küçük Menderes Basin located on the western part of the Turkey. Monitoring studies were carried out in 21 water bodies for a 1-year period for 45 PSs and monitoring results were compared with environmental quality standards (EQS). It was determined that 13 of 45 PSs in 15 water bodies exceeded the EQS. The common PSs in the basin were lead, nickel, fluoranthene, benzo(a)pyrene, C10–13 chloroalkanes, and 4-nonylphenols and average rates of exceeding the EQS were 58.3%, 36.4%, 91.5%, 99.9%, 74.8%, and 49.4%, respectively. The detailed emission inventory of each water body in the basin has been made. Potential sources of PSs were searched via the matrix formed and a total number of 420 basic and supplementary measures were proposed to improve the water quality of the sub-basin.

根据水框架指令（WFD），应通过监测和评估研究确定流域内每个水体的化学状况，并在流域管理计划中揭示水体状况与良好水体状况之间的差距. 在此背景下，本研究给出了从评估优先物质 (PS) 的监测结果到确定实现地表水良好状况的措施结束的方法。主要目的是提供一种有用的方法，定义为一个矩阵，用于确定造成这一差距的污染物来源。该矩阵应用于位于土耳其西部的 Küçük Menderes 盆地污染最严重的子流域。在 21 个水体中对 45 个 PS 进行了为期 1 年的监测研究，并将监测结果与环境质量标准 (EQS) 进行了比较。确定15个水体的45个PS中有13个超标。流域常见PSs为铅、镍、荧蒽、苯并(a)芘、C10-13氯代烷烃、4-壬基酚等，平均超标率分别为58.3%、36.4%、91.5%、99.9%、74.8% , 和 49.4%。编制了流域内各水体的详细排放清单。通过形成的矩阵寻找PSs的潜在来源，提出了420项改善该子流域水质的基本和补充措施。确定15个水体的45个PS中有13个超标。流域常见PSs为铅、镍、荧蒽、苯并(a)芘、C10-13氯代烷烃、4-壬基酚等，平均超标率分别为58.3%、36.4%、91.5%、99.9%、74.8% , 和 49.4%。编制了流域内各水体的详细排放清单。通过形成的矩阵寻找PSs的潜在来源，提出了420项改善该子流域水质的基本和补充措施。确定15个水体的45个PS中有13个超标。流域常见PSs为铅、镍、荧蒽、苯并(a)芘、C10-13氯代烷烃、4-壬基酚等，平均超标率分别为58.3%、36.4%、91.5%、99.9%、74.8% , 和 49.4%。编制了流域内各水体的详细排放清单。通过形成的矩阵寻找PSs的潜在来源，提出了420项改善该子流域水质的基本和补充措施。编制了流域内各水体的详细排放清单。通过形成的矩阵寻找PSs的潜在来源，提出了420项改善该子流域水质的基本和补充措施。编制了流域内各水体的详细排放清单。通过形成的矩阵寻找PSs的潜在来源，提出了420项改善该子流域水质的基本和补充措施。