Disposable commercial CI8 mini-cartridges are treated with tributyltin chloride (TBTCI) and used for selective pre-concentration of Crvl from aqueous solutions. The accumulated Crvl -TBTCI adduct is eluted with 5 ml of methanol and measured using electrothermal atomic absorption spectrometry. Pre-concentration factors of 100-fold are readily achieved for 0.100 ng ml-1 samples of CrVl with an average recovery of 98 k 8%.
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