DETERMINATION OF TOTAL PHOSPHORUS BY ICP-OES

1 Solutions with phosphorus compounds are nebulised into an argon plasma, where all components are vaporised. Phosphoms compounds are dissociated and excited, and then emit radiation of which the intensity is measured at a wavelength of 178.222 nm. 

2 This determination may be carried out on digest 2.1 (digestion with Hj,SO - salicylic acid - H2O2 Se) and digest 2.2 (digestion with Hj,SO - salicylic acid - H OJ, digest 

1 This procedure yields a standard curve that is linear up to at least 100 mg/L P. 

2 The detection limit is approximately 0.04 mg/L in the digest. The determination limit is approximately 0.12 mg/L (0.4 respectively 1.2 mmol/kg in the 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 5 % + 5 mmol/kg. 

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