A DETERMINATION OF NICKEL BY FLAME AAS

1 The sample is nebulised into an air-acetylene flame, where it is vaporised nickel compounds are atomised and the nickel atoms thus formed absorb radiation from a hollow cathode lamp. The absorbance is measured at a wavelength of 232.0 nm, using background correction. 

1 This procedure yields a standard curve that is linear up to approximately 2 mg/L Ni. 

2 The detection limit is approximately 0.1 mg/L in the digest The determination limit Is approximately 0.3 mg/L (15-38 mg/kg in the dried plant material). 

1 To avoid interferences as much as possible, background correction is necessary. 

1 The reproducibility of determinations by this procedure should give, at reasonable control and thorough sample preparation, a coefficient of variation within 5 % + 5 mg/kg. 

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