TY - JOUR
T1 - Pre-concentration of trace elements in short chain alcohols using different commercial cation exchange resins prior to inductively coupled plasma-optical emission spectrometric detection
AU - Nomngongo, Philiswa N.
AU - Catherine Ngila, J.
AU - Kamau, Joseph N.
AU - Msagati, Titus A.M.
AU - Marjanovic, Ljiljana
AU - Moodley, Brenda
PY - 2013/7/17
Y1 - 2013/7/17
N2 - 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 0.1-1.2μgL-1 and 0.3-1.5μgL-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.
AB - 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 0.1-1.2μgL-1 and 0.3-1.5μgL-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.
KW - Alcohols
KW - Cation exchange resins
KW - Dowex 50W-x8
KW - Pre-concentration
KW - Separation
KW - Trace metals
UR - http://www.scopus.com/inward/record.url?scp=84879881022&partnerID=8YFLogxK
U2 - 10.1016/j.aca.2013.05.041
DO - 10.1016/j.aca.2013.05.041
M3 - Article
C2 - 23830424
AN - SCOPUS:84879881022
SN - 0003-2670
VL - 787
SP - 78
EP - 86
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
ER -