Theoretical Studies for Arsenic Interferences by Inductively Coupled Plasma Mass Spectrometer

A study on the thermochemistry of species ((ArCl+)-Ar-40-Cl-35, (CoO+)-Co-59-O-16, (ArArH+)-Ar-36-Ar-38-H-1, (ArCl+)-Ar-38-Cl-37, (ArK+)-Ar-36-K-39, Nd-150(++), Sm-150(++) and Eu-150(++)) that interfere with arsenic in inductively coupled plasma mass spectrometer was estimated by Gaussian code. Moreover, (AsCH3F+, AsF+, AsCH2+, AsCHF+ and AsO+) that result from the reactions between arsenic and different gases such as H-2, O-2 and CH3F, which are commonly used in dynamic reaction cell-inductively coupled plasma-mass spectrometer, have been investigated. The structures of polyatomic molecules are optimized; ionization energies, heats of formation (Delta H-f degrees(0) and Delta H-f degrees(298)) and proton affinity (PA) of some species are estimated by theoretical calculations using different methods in Gaussian.