Assessment of heavy metal pollution in the soil of Ahwaz oilfield by using the five-stage process of chemical dissociation and Dendrogram interpretation and pollution severity index

چراغی, محبوبه; کرباسی, عبدالرضا; منوری, سید مسعود; باغوند, اکبر

doi:10.22034/jess.2022.319056.1695

Assessment of heavy metal pollution in the soil of Ahwaz oilfield by using the five-stage process of chemical dissociation and Dendrogram interpretation and pollution severity index

نوع مقاله : مقاله پژوهشی

نویسندگان

محبوبه چراغی ¹

عبدالرضا کرباسی ²

سید مسعود منوری ³

اکبر باغوند ⁴

¹ Assistant Professor Of Department of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz

² مهندسی محیط زیست، دانشکده محیط زیست دانشگاه تهران، تهران، ایران

³ 3Assistant Professor, Department of Environmental Science, Faculty of Environment and Energy,Science and Research Branch, Islamic Azad University, Tehran, Iran.

⁴ دانشیار دانشکده محیط زیست دانشگاه تهران

10.22034/jess.2022.319056.1695

چکیده

The aim of this study is to evaluate heavy metal pollution in the soil of Ahwaz oil field which is the biggest oil field in Iran, by using chemical dissociation process and Dendrogram interpretation and pollution severity index. The 20 stations were selected on the soil surface. Parameters of nickel, vanadium, cobalt, iron, chromium, barium, arsenic and total petroleum hydrocarbons concentrations were determined. Five-step process of chemical dissociation method was used to identify and determine human-made and natural heavy metals concentration, and also MVSP software was used to draw the cluster analysis dendrogram. The results of chemical dissociation show that the origin of the nickel, vanadium and cobalt elements and also of iron, chromium and arsenic in new wells is higher in the human-made and the natural phase, respectively. The results of pollution severity index for nickel showed that 25% of the stations in clean class, 50% in low pollution class and 25% are in middle pollution class. 40% of the stations in terms of vanadium pollution in clean class, 40% in low pollution class and 20% are in middle pollution class. In terms of cobalt pollution, 35% of the stations in the clean class, 40% in low pollution class, 20% in the middle pollution class and 5% are in the high pollution class. In terms of chromium pollution, 75% of the stations in the clean class, 25% are in low pollution class and also for iron and arsenic all the stations are in the clean class.

کلیدواژه‌ها

Ahvaz oilfield

five-stage chemical dissociation

heavy metals