DETERMINATION OF CADMIUM BY ETA-AAS

1 Cadmium ions in the digest are subsequently dried, ashed and vaporised by eiectricai heating in a graphite furnace. The cadmium atoms thus formed absorb radiation from a hollow cathode lamp. The absorbance is measured at a wavelength of 228.8 nm. 

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

2 The detection limit is approximately 0.05 pg/L in the digest. The determination limit is approximately 0.15 pg/L (7.5-18 pg/kg in the dried plant material). 

1 To avoid interferences as much as possible, background correction is necessary (e,g. Zeeman background correction). 

1 The reproducibility of determinations by this procedure should give, at reasonable control and thorough sample preparation, a coefficient of variation within 10 %. 

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