title: Selective extraction of chromium(VI) using a leaching procedure with sodium carbonate from some plant leaves, soil and sediment samples.
abstract: Speciation of chromium in some plant leaves, soil and sediment samples was carried out by selective leaching of Cr(VI) using a sodium carbonate leaching procedure. Total chromium from the samples was extracted using aqua regia and oxidative acid digestion, respectively. The concentrations of chromium species in the extracts were determined using by graphite furnace atomic absorption spectrometry (GFAAS). Uncoated graphite furnace tubes were used as an atomizer. Due to the presence of relatively high amounts of Na(2)CO(3) in the resulting samples, the possible influences of Na(2)CO(3) on the absorbance signals were checked. There is no interference of Na(2)CO(3) on the chromium absorbance up to 0.1 mol L(-1) Na(2)CO(3). A limit of detection (LOD) for determination of Cr(VI) in 0.1 Na(2)CO(3) solution by GFAAS was found to be 0.93 microg L(-1). The procedure was applied to environmental samples. The relative standard deviation, R.S.D. as precision for 10 replicate measurements of 20 microL(-1) Cr in processed soil sample was 4.2%.
authors.affiliation: Department of Chemistry, Pamukkale University, 20017 Denizli, Turkey. elci@pamukkale.edu.tr
authors.forename: Latif
authors.initials: L
authors.lastname: Elci
authors.forename: Umit
authors.initials: U
authors.lastname: Divrikli
authors.forename: Abdullah
authors.initials: A
authors.lastname: Akdogan
authors.forename: Aysen
authors.initials: A
authors.lastname: Hol
authors.forename: Ayse
authors.initials: A
authors.lastname: Cetin
authors.forename: Mustafa
authors.initials: M
authors.lastname: Soylak
mesh_terms: D002254:Carbonates / Q000737:chemistry*; D002857:Chromium / Q000302:isolation & purification*; D019015:Geologic Sediments / Q000737:chemistry*; D007202:Indicators and Reagents; D018515:Plant Leaves / Q000737:chemistry*; D012987:Soil / Q000032:analysis*; D013054:Spectrophotometry, Atomic; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D002254:Carbonates; D007202:Indicators and Reagents; D012987:Soil; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion; C005686:sodium carbonate