B DETERMINATION OF MAGNESIUM BY ICP-OES

1 Solutions with magnesium compounds are nebulised into an argon plasma, where all components are vaporised. Magnesium compounds are dissociated and excited, and then emit radiation of which the intensity is measured at a wavelength of 280.270 nm. 

1 This procedure yields a standard curve that is linear up to at least 40 mg/L Mg. 

2 The detection limit is approximately 0.001 mg/L in the digest The determination limit is approximately 0.003 mg/L (0.01 respectively 0.04 mmol/kg in the dried plant 

1 The reproducibility of determinations by this procedure should give, at reasonable control and thorough sample preparation, a coefficient of variation within 8 % + 5 mmol/kg. 

1 Inductively coupled plasma optical emission spectrometer. 

---