Investigating and identification of sources and parameters of water pollution in Karaj River in Islamshahr range

The present research is conducted to study some heavy metals pollutants in Karaj River (the most famous river located in Islamshahr) including soluble oxygen, pH, TDS, EC, salinity; in addition, concentration of heavy metals including Ni, Cr, Cd, Zn, Pb, Cu, and As was also analyzed in water samples.To determine and examine the parameters, sampling steps were carried out at 5 stations along the River in February excluding other stations due to lack of water. Research data were analyzed using Pearson correlation coefficient test through SPSS. pH mean level 5555 in surface water samples indicates alkaline nature of water samples. High water conductivity of Karaj River results from agricultural and industrial activities. High TDS is related to water nitrate frequency. The descending trend of water sample main cations mean concentration is as follows: Magnesium> Calcium> Sodium> Chlorine. In Pier chart, water anions are of sulfate-type in the carbonate and bicarbonate facies; and water type in cations is of sodium- potassium situated in Manizic and Calcic facies. According to the results of correlation coefficients between nickel metal elements with chrome, copper with zinc, as well as chrome with zinc, the common origin of earth-born and lithogenic (human activities) is probably supplied in the River water. Furthermore, sulfate anions and some metal elements showed a positive correlation; in addition, chlorine ion also explains elements transportation at the sulfide phase.