title: Pre-concentration of trace elements in short chain alcohols using different commercial cation exchange resins prior to inductively coupled plasma-optical emission spectrometric detection.
abstract: Chelex-100, Dowex 50W-x8 and Dowex MAC-3 exchange resins were investigated for separation and pre-concentration of trace amounts of Cd, Cr, Cu, Fe, Mn, Pb, Ti and Zn in alcohols with respect to retention and desorption characteristics. Dowex 50W-x8 was found to be the best sorbent with percentages recoveries >95%. In addition, Chelex-100 appeared to be suitable for the pre-concentration of Cu, Fe and Zn, whereas Dowex MAC-3 was selective for Cu and Fe. Therefore, Dowex 50W-x8 was used for further investigations. The relative standard deviations <4% (n=20), limits of detection and quantification were 0.1-1.2 μg L(-1) and 0.3-1.5 μg L(-1), respectively. The SPE method was validated against a certified reference material and the results were in agreement with certified values. The accuracy of the optimized method was verified by the recovery test in the spiked alcohol samples. The accuracy and spike recovery test for different metal ions were in the range 98-102% and 95-105%, respectively. The optimized method was applied to the separation and pre-concentration of metal ions in different commercial alcohol samples.
authors.affiliation: Department of Applied Chemistry, University of Johannesburg, Johannesburg, 2028, South Africa.
authors.forename: Philiswa N
authors.initials: PN
authors.lastname: Nomngongo
authors.forename: J
authors.initials: J
authors.lastname: Catherine Ngila
authors.forename: Joseph N
authors.initials: JN
authors.lastname: Kamau
authors.forename: Titus A M
authors.initials: TA
authors.lastname: Msagati
authors.forename: Ljiljana
authors.initials: L
authors.lastname: Marjanovic
authors.forename: Brenda
authors.initials: B
authors.lastname: Moodley
mesh_terms: D019840:2-Propanol / Q000032:analysis / Q000737:chemistry; D000438:Alcohols / Q000032:analysis* / Q000737:chemistry; D000440:Butanols / Q000032:analysis / Q000737:chemistry; D002411:Cation Exchange Resins / Q000737:chemistry*; D000431:Ethanol / Q000032:analysis / Q000737:chemistry; D000432:Methanol / Q000032:analysis / Q000737:chemistry; D013054:Spectrophotometry, Atomic / Q000379:methods*; D014131:Trace Elements / Q000032:analysis* / Q000737:chemistry
chemical_list: D000438:Alcohols; D000440:Butanols; D002411:Cation Exchange Resins; D014131:Trace Elements; C043958:2-butanol; D000431:Ethanol; D019840:2-Propanol; D000432:Methanol
keywords: Alcohols; Cation exchange resins; Dowex 50W-x8; Pre-concentration; Separation; Trace metals