Determination of hexavalent chromium in aqueous and alkaline soil extracts

Authors : Tsvetomil VOYSLAVOV, Stefan TSAKOVSKI, Sonya GANEVA

Pages : 944-952

View : 22 | Download : 10

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :A fast, simple, and reliable method for determination of hexavalent chromium species in soil aqueous and alkaline extracts has been developed. The procedure is based on the ion-pair extraction of Crinsert ignore into journalissuearticles values(VI); with methyltrioctylammonium chloride insert ignore into journalissuearticles values(Aliquat 336); into xylene. The extract is analyzed by flame insert ignore into journalissuearticles values(FAAS); or electrothermal atomic absorption spectrometry insert ignore into journalissuearticles values(ETAAS);. The method allows the detection of up to 2 mg kg$^{-1}$ Crinsert ignore into journalissuearticles values(VI); by FAAS and up to 25 $\mu $g kg$^{-1}$ Crinsert ignore into journalissuearticles values(VI); by ETAAS. The relative standard deviation varied in the range 2%-12% depending on the Crinsert ignore into journalissuearticles values(VI); levels in the samples. The analysis of certified reference material CRM041-30G Chromium VI--Soil and spike experiments showed recoveries from 91% to 106%. The procedure was applied to industrially polluted soils.
Keywords : Soil, liquid phase extraction, Cr VI, flame atomic absorption spectrometry, electrothermal atomic absorption spectrometry