A DETERMINATION OF COPPER BY FLAME AAS

1 The sample is nebulised into an air-acetylene flame, where it is vaporised copper compounds are atomised and the copper atoms thus formed absorb radiation from a hollow cathode lamp. The absorbance is measured at a wavelength of 324.8 nm. 

1 This procedure yields a standard curve that is linear up to approximately 4 mg/L 

2 The detection iimit is approximately 0.02 mg/L in the digest. The determination limit is approximateiy 0.06 mg/L (3.0-7.5 mg/kg in the dried plant material). 

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

1 B Stock Solution. Cu concentration 1000 mo/L - Dissolve 3.929 g copper sulphate 

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