Abstract
A method for the determination of nickel in urine and other biological samples by graphite furnace AAS has been developed and employed for clinical applications. This method offers several advantages: The digestion of the samples with nitric and perchloric acids is time-saving, nickel is precipitated with ammonium pyrrolidine dithiocarbamate over a wide range of acidity and Ni-PDC in MIBK is fairly stable for one week. The coefficient of variation from run-to-run is 7.3% based on analyses of the same urine specimen containing 1.2 μg/l of nickel on 9 successive working days, and the coefficient of variation within a single run is 4.7% based on 8 analyses of a single urine specimen containing 1.3 μg/l of nickel within the same day. A good agreement is obtained with the certified values when the method is applied to the determination of nickel in biological standard reference materials.
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