DETERMINATION OF LEAD BY ICP-MS

1 Solutions with lead 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. Lead is determined by the sum of mass 206, 207, and 208 amu. 

1 This procedure yields a standard curve that is linear up to approximately 50 pg/L Pb. 

2 The detection limit is approximately 0.04 pg/L in the digest. The determination limit is approximately 0.12 pg/L (13 respectively 40 pg/kg in the dried plant material). 

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

1 B Stock Solution. Pb concentration 1000 mo/L - Dissolve 1.5985 g lead nitrate, 

---