A DETERMINATION OF ARSENIC BY ICP-MS

1 Solutions with arsenic compounds are nebulised into an argon plasma, where all components are vaporised. The ions produced are entrained in the plasma gas and introduced into a mass spectrometer, sorted according to their mass-to-charge ratios, and quantified with a channel electron multiplier. Arsenic is determined at mass 75 amu. 

2 This determination may be carried out on digest 2.3 (microwave digestion with 

HNO3 - HjOj. - HF), digest 2.4 (digestion with HNO, - - HF) and digest 2.7 

1 This procedure yields a standard curve that is linear up to at least 50 pg/L As. 

2 The detection limit is approximately 0.007 pg/L in the digest. The determination limit is approximately 0.021 pg/L (2 respectively 7 pg/kg in the dried plant material). 

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