Document Type : Research Paper

Authors

• Leila Davashi ¹
• Hamidreza Azimzadeh ²

¹ Graduated MSc. Environmental science, Yazd University

² Associate Natural Resources and Desert Studies faculty - ADRI, Yazd University

Abstract

Increasing in concentration of heavy metals such as Lead, Cadmium, Nickel, Chromium and Zinc cause considerable harmful effects on soil and environment. These elements are also hazardous to health of humans and wildlife. Petrochemical plants and refineries pollution increase the amount of carcinogenic and tratogenic compounds in environment. The main goal of recent paper is the studying of soil heavy metals pollution surrounding Isfahan refinery, power plant and petrochemical industries are located in margin of Ghamishlou wildlife refuge. In this study, 25 soil samples were collected from 105 km radius around the complex industries. Estimating the background values was executed by sampling rocks adjacent to soil sampling stations. Soil heavy metals were extracted with ISO11466 procedure, and were measured by flame AAS (Analyticjena-350). Geo-accumulation Index (Igeo) and Pollution Index (PIi) were determined and compared in different sample sites. Igeo and PIi in soil samples found to be in order of Cd>Pb>Ni>Zn>Cr. The result shows, in comparison of Igeo with PIi, in the same pollutant concentration, Igeo classifies the pollution in lower qualitative classes. In addition, also mCd and IPI detect different results to classify pollution. According to mCd , there are eight point sample which categorize in moderate level of pollution while these points locate in low class with considering IPI. In this respect, mCd and IPI have shown same result in moderate and high pollution level. Finally, the result showed that margin of petrochemical, refinery and power plant, IPI classified integrating pollution in Moderate to high level but mCd categorized pollution in low to moderate classes.

Keywords

• ghameshlou wildlife refuge
• Refinery
• Heavy metals
• Pollution Index