Evaluating of Relationship between Lead Accumulation with Physico-Chemical Properties of Soils of Aqqala, Golestan Province

Abstract

Lead accumulation in soil is influenced by various factors such as physico-chemical properties of soil, parent materials of rock, soil pollutant resources, organic and chemical fertilizers in agriculture and etc. So, the aim of this study is to evaluate the effect of soil physico-chemical properties on accumulation of lead in soil. The study area is located in 20 kilometers ambitious Aq- qala to Inche boroon road. Soil sampling was carried out in 5 blockswith distance of 3000 m. In each block six soil samples from 0-5 cm depth with a gap of 200 meters from each other were taken, totally 30 soil samples. After measuring the lead content, physical characteristics, texture and Bd and chemical, OM, SAR, CaCO3, EC and pH of soil samples were tested. Effects of soil properties on lead accumulation were analyzed by using linear and multiple regressions.Results showed that soil physical properties have no effect on the accumulation of lead. Among soil chemical properties, CaCO3 and EC had significant negative correlation and pH and OM had significant positive correlation with lead accumulation. Moreover, no significant relationship was observed between SAR and lead contents in the soil.Therefore, in the selected model based on the results of analysis of variance (by linear regression method), variables such as CaCO3, EC, pH and OM were selected as the most important factors that could express the lead concentration in the study area.

Keywords

• soil contaminants
• heavy metals
• agricultural land
• environmental pollution