Preconcentration of molybdenum, antimony and vanadium in gasolsine samples using Dowex 1-x8 resin and their determination with inductively coupled plasma–optical emission spectrometry

Strong ion exchangers (Dowex 50W-x8 and Dowex 1-x8) were used for the separation and preconcentration of trace amounts of Mo, Sb and V in gasoline samples. Dowex 1-x8 resin was found to be suitable for the quantitative retention of these metal ions from organic matrices. The elution of the metal ions from Dowex 1-x8 resin was achieved by using 2.0molL−1 HNO3 solution. The Dowex 1-x8 preconcentration and separation method gave an enrichment factor of 120 with limits of detection equal to 0.14, 0.05 and 0.03μgL−1 for Mo, Sb and V, respectively. The limits of quantification were found to be 0.48, 0.18 and 0.10μgL−1 for Mo, Sb and V, respectively. Under optimized conditions, the relative standard deviations of the proposed method (n=20) were