A MATHEMATICAL MODEL TO PREDICT NICKEL CONCENTRATION IN KARAJ RIVER SEDIMENTS

The contamination of surface waters through human activities has been intensified over the past years aspopulation density has increased. Nickel is a metallic element and fuel combustion, nickel mining.refining waste, sewagesludge, and incineration are the major sources of nickel propagation . Nickel fromvarious industrial wastewaters and other sources finally are disposed into water bodies. In this work.Karaj river was considered from 50° to 50° 14 longitudes and 35° 45 to 35° 58 latitudes and thepresence of nickel was also assessed in this area. Sixteen stations were randomly selected and sedimentsamples were collected in polyethylene containers. Some water quality parameters such as pH,temperature. dissolved oxygen, electrical conductivity, were determind by direct on-site measurements.To measure COD, 16 water samples were collected in dark bottles and transferred to laboratory spatialparameters such as slope and distance from start point were also calculated by ARCGIS 9.2. The relationbetween Ni concentration with spatial parameters and water quality parameters were obtained bymultivariate analysis . Results showed that there was a significant relation between Ni concentration insediments and distance from start pointandelectrical conductivity.