A DETERMINATION OF CHROMIUM BY ICP-OES

1 Solutions with chromium compounds are nebulised into an argon plasma, where all components are vaporised. Chromium compounds are dissociated and excited, and then emit radiation of which the intensity is measured at a wavelength of 205.560 nm. 

1 This procedure yields a standard curve that is linear up to at least 2 mg/L Cr. 

2 The detection limit is approximately 0.003 mg/L in the digest. The determination limit is approximately 0.009 mg/L (0.9 respectively 2.7 mg/kg in dried plant material). 

1 The reproducibility of determinations by this procedure should give, at reasonable control and thorough sample preparation, a coefficient of variation within 10 % + 5 mg/kg. 

1 Inductively coupled plasma optical emission spectrometer. 

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