Impact of agricultural activities on accumulation of Cadmium, Cobalt, Chromium, Copper, Nickel and Lead in soil of Hamedan province

Use of chemical fertilizers, pesticides and sewage sludge in agriculture lands haveincreased soils trace metals concentration in many parts of the world. In This article wereport the results of a study on impacts of agricultural activities on soil accumulation ofCadmium, Cobalt, Chromium, Copper, Nickel and Lead and risk of metal contamination inHamedan Province using contamination factor. The soil samples were collectedsystematically from agriculture fields with cultivation period of 65, 35 and 20 years. Theresults showed the mean concentration of Cd, Co, Cr, Cu, Ni and Pb in the soils wasincreased with the cultivation period and a significant difference was seen between theconcentrations of metals, except for Pb, in the soil under different cultivation periods. Thetrend of soils trace metal accumulation of Cd, Co, Cr and Cu was exponential, whereas forNi and Pb, it was quadratic and linear, respectively. Also, based on the calculatedcontamination factors, the soils classified as none and none to medium class pollution weregenerally found in lands with more length of cultivation. The increase of trace metalsconcentration in the soil followed the increase in the use of fertilizers in the region. Thecultivated soils thus provide a way for entrance of trace elements in the human’s foodchain. Therefore, monitoring contaminated soils is necessary to control and prevent therisks from contaminated soils.

Impact of agricultural activities on accumulation of Cadmium, Cobalt, Chromium, Copper, Nickel and Lead in soil of Hamedan province Keywords:

Accumulation trend , Agricultural activities , Contamination factor , Traces metal