Distribution of different fractions of Iron, Zinc, Chromium, lead and Nickel in Soils around Petrol filling stations in selected Areas of Delta State, Nigeria

Journal of Applied Sciences and Environmental Management

OSAKWE, STEPHEN ANAPUWA¹  OKOLIE, LUCKY PRECIOUS¹ 

关键词: Soil pollution;    speciation;    petrol filling stations;    heavy metals;    Delta State;   

DOI  :  

学科分类：环境科学（综合）

来源: University of Port Harcourt * Department of Pure and Industrial Chemistry

【 摘 要 】

The geochemical forms of some heavy metals in soils around selected petrolfilling stations were studied in order to assess the mobility and bioavailability of the metals andhence their potential environmental risk. Water soluble fraction (F1) contained an average of0.97% iron, 1.40% zinc, 2.37% chromium, 2.08% lead and 41.96% nickel with the abundancetrend of Ni > Cr > Pb > Zn > Fe. Metal bound to exchangeable phase followed the sameabundance trend with an average of 6.46% nickel, 5.48% chromium, 2.64% lead, 2.55% zincand 0.62% iron. Lead was predominantly associated with carbonate fraction with an average of52.32% followed by iron with an average of 15.41%. Other metal average levels in thecarbonate fractions were 9.66% for nickel, 8.78% for chromium, and 8.73% for zinc giving theabundance trend of Pb > Fe > Ni > Cr > Zn. The most important metal in iron-manganese oxidephase was zinc with an average of 42.49%, followed by iron with an average of 32.82%. Theaverages of the other metals bound to this phase were 30.39%, 13.24% and 6.46% forchromium, lead and nickel respectively. The organic bound metals were in the abundance trendof Fe > Zn > Cr > Pb > Ni with average of 39.48% for iron, 30.87% for zinc, 23.03% forchromium, 8.54% for lead and 4.94% for nickel. Nickel with an average of 51.58% waspredominantly associated with the residual fraction. The other metals bound to this phase inorder of their importance to the fraction had the average of 22.75% for chromium, 13.96% forzinc, 12.24% for lead and 10.97% for iron. The mobility factor values of the metals weremoderately high with the abundance trend of Pb > Ni > Cr > Fe > Zn. The generally low levelsof the metals in the residual fraction coupled with the mobility factor trend suggest potential riskfor the metals.

【 授权许可】

Unknown