نوع مقاله : مقاله پژوهشی
1 کارشناس ارشد مهندسی محیط زیست، دانشکده محیط زیست، دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران
2 دانشیار دانشکده بهداشت، دانشگاه علوم پزشکی جندی شاپور اهواز
3 استادیار دانشکده محیط زیست، دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران
4 استادیار دانشکده بهداشت، دانشگاه علوم پزشکی لرستان
عنوان مقاله [English]
This study was performed to evaluate the corrosion and leakage potentials of some important heavy metals (Pb, Cd, Zn, Cu, Fe and Mn) using the USEPA standard procedure. For the purposes of this study, 76 sampling points were selected across the study area including raw water intakes, treatment effluents, and tap waters in Ahvaz distribution network. After a minimum retention period of 6 hours in the distribution network, the first samples were taken according to the standard method, repeating the sampling procedure on a monthly basis for six months. Sample preparation and digestion were accomplished using the spectrophotometric atomic absorption technique to determine the concentration levels of the above-mentioned heavy metals. The results obtained were compared with USEPA standard indices and the corrosion potential was evaluated on the basis of heavy metals leakage measurements using SPSS software version 11.5. The results from six rounds of tests indicated values of 8.48, 0.97, 3180, 168, 257 and 30.6 micrograms per liter as the mean heavy metal concentration levels for Pb, Cd, Zn, Cu, Fe, and Mn respectively. Furthermore, the data indicated the high corrosion potential in Ahvaz drinking water distribution network and the leakage of heavy metals into the network closely associated with the corrosion phenomenon. Based on our findings, the USEPA standard method for corrosion evaluation in drinking water distribution networks is simple, accurate, and reliable.