A possilbe steady state kinetic model for theatomization and excitation processes during inductively coupled palsma atomic emission spectrometry:Application to interference effects of lithiumon calcium

摘要

A possible steady state kinetic model is pre- sented for the atomization and excitation processes during inductively coupled plasma atomic emission spec.trome- try. The model takes into account the relative rates of (a) thermal dissociation of analytesalt, (b) recQmbination of counter atom and analyte atoms, (c) charge tr&nsfer be- tween analyte and interferent species, (d) charge transfer between analyte and argon species, and (e) iop/electron collisionalde-ionization. Number density ratio dat~,nu'u, where nu denotes the excited state and the prime denotes the presence of an interferent element, are presented showing that the predictions of the model are consistent with the signal enhancement observed at low analyte con- centrations when Ca is determined by ICP in the presence of excess Li.