DETERMINATION OF MANGANESE BY ICP-MS

1 Solutions with manganese 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, arxl quantified with a channel electron multiplier. Manganese is determined at mass 55 amu. 

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

2 The detection limit is approximately 0.014 pg/L in the digest. The determination limit is approximately 0.042 pg/L (5 respectively 14 pg g 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 10 %. 

2 Standard Solution. Mn concentration 1 mn/l - Pipette 1 mL concentrated nitric acid (65 % s.p.) in a 1000-mL polythene volumetric flask which already contains about 500 mL ultra pure water. Add 1.00 mL stock solution (6.1 A or 6.1 B) in a 1000-mL volumetric flask and make up to volume with ultra pure water. 

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