title: Speciation of vanadium in coal mining, industrial, and agricultural soil samples using different extractants and heating systems.
abstract: A fast microwave-assisted extraction procedure was developed for the speciation of vanadium (V) species in soil samples collected from the vicinity of the Lakhra coal power plant (situated near a coal mining area) and industrial and agricultural areas. Soil samples were treated with two extracting reagents, (NH4)2HPO4 (0.2-1 M) and Na2CO3 (0.1-0.5 M), and heated by conventional and microwave methods for different time intervals to extract V+5 species. The V+4 and total V were extracted from filtration residue and the same subsamples of soil by treating with the acid mixture of HNO3-HCl-HClO4-H2SO4 (1:1:1:1, v/v/v/v). No significant difference between V+5 contents obtained by conventional heating and microwave-assisted extraction was observed (P = 0.485). The extraction efficiency of 0.6 M (NH4)2HPO4 for V+5 was lower (4-7%) than that obtained by 0.2 M Na2CO3 solution. The levels of V+5 were higher in soil samples collected from the vicinity of the Lakhra coal power plant and industrial areas, compared to those obtained from agricultural soil.
authors.affiliation: University of Sindh, Center of Excellence in Analytical Chemistry, Jamshoro, Pakistan, 76080.
authors.forename: Sumaira
authors.initials: S
authors.lastname: Khan
authors.forename: Tasneem Gul
authors.initials: TG
authors.lastname: Kazi
authors.forename: Hassan Imran
authors.initials: HI
authors.lastname: Afridi
authors.forename: Nida Fatima
authors.initials: NF
authors.lastname: Kolachi
authors.forename: Naeem
authors.initials: N
authors.lastname: Ullah
authors.forename: Kapil
authors.initials: K
authors.lastname: Dev
mesh_terms: D000383:Agriculture; D003032:Coal Mining; D006361:Heating; D007221:Industry; D012989:Soil Pollutants / Q000032:analysis*; D014639:Vanadium / Q000032:analysis*
chemical_list: D012989:Soil Pollutants; D014639:Vanadium