A DETERMINATION OF MANGANESE BY FLAME AAS

1 The sample is nebulised into an air-acetylene flame, where it is vaporised manganese compounds are atomised and the manganese atoms thus formed absorb radiation from a hollow cathode lamp. The absorbance is measured at a wavelength of 279.5 nm. 

1 This procedure yields a standard curve that is linear up to approximately 3 mg/L 

2 The detection limit is approximately 0.02 mg/L in the digest. The determination limit is approximately 0.06 mg/L (3-10 mg/kg in the dried plant material). 

1 Lanthanum is added to prevent condensed phase interferences. 

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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