RT - Journal Article T1 - Investigation of Zayandehrud Water Pollution by Diazinon and its Assimilative Capacity JF - JSTNAR YR - 2011 JO - JSTNAR VO - 15 IS - 56 UR - http://jstnar.iut.ac.ir/article-1-1703-en.html SP - 1 EP - 20 K1 - Water pollution K1 - Zayandehrud K1 - Fehlman well K1 - HPLC K1 - Diazinon K1 - Assimilative capacity AB -   In this study, chemical quality of Zayandehrud river between Zayandehrud Regulating Dam and Nekouabad Diversion Dam, three discharging drains and one Fehlman well were measured using HPLC with determine the pollution concentration of diazinon insecticide from July 2006 to March 2007. Also, Zayandehrud’s assimilative capacity was determined. The results showed that river water and drains were not polluted to diazinon. Physical, chemical and biological factors effective in the diazinon detection were assessed. Diazinon was detected in the groundwater sample in October with concentration of 32.1 ng/L. This level was lower than the maximum permissible level for drinking water. Also, the NO-3 concentration in this month was 24 mg/L that is 2.4 times the standard level (10 mg/L). Due to the increased discharge of different wastewaters to Zayandehrud, its assimilative capacity decreased from upstream to downstream. So, prevention of use of pesticides and pre-treatment of wastewaters that are discharged to this river need more attention. LA eng UL http://jstnar.iut.ac.ir/article-1-1703-en.html M3 ER -