Assessing the health risk, pollution and source of some heavy metals in the soil around Zanjan, Iran

In this study, heavy metals in the soil around the Zanjan city, by using indicators of pollution, carcinogenic and non-carcinogenic risk and determining the origin by using statistical methods.

In this study, 30 soil samples were taken from a depth of 0-20 cm and analyzed based on the method of acid digestion by induction coupled plasma spectroscopy.

The enrichment factor for zinc and cadmium was in the extreme enrichment category with an average of 42.1 and 34.5, respectively, and the land accumulation index for cadmium was in the high pollution category with an average of 2.8. Spatial changes of the index of pollution load and modified degree of pollution showed that the intensity of pollution increased near the industrial centers and the linear regression between the ecological risk and the median coefficient of the medium effect range (R2=0.903) showed that 76% of the samples They are in the possibility of toxicity. Cadmium had the highest risk in children and adults with an average non-carcinogenic risk index of 2 and 0.5, especially exposed to skin absorption with an average of 0.5. It shows the risk of more cancer diseases. The result of determining the origin and contribution of heavy metals with the help of statistical evaluations showed that lead, zinc and cadmium are the result of human activities and chromium, copper and arsenic are the result of the combination of human and earth-born activities. have gathered in the area

In order to reduce the negative environmental effects of heavy metals in the soil of the study area, measures such as reducing the entry of pollutants into the soil and refining polluted Soil.