Oxygenation Mechanism of Ions in Dynamic Reaction Cell ICP-MS

Suppression of the Incoherent Molecular Formation Effect by Oxygen Gas in Arsenic Analysis by ICP-MS

“…Also, the mechanism of selective oxygenation of ions in ICP-DRC-MS was elucidated by using theoretical calculations, which were based on the enthalpy changes (ΔH) in reactions between elemental ions (M + ) and O2. 20 According to our previous study of the IMF effect, the sensitivity difference in ICP spectrometry was caused by differentiation of the formation of AsH + and AsH3 + from As + between As(III) and As(V). 19 In order to understand the mechanism of the effect of O2 gas, we investigated the enthalpy change (ΔH) of the reaction between the As-related ions and O2 using theoretical calculations.…”

“…However, O2 is so reactive with many kinds of elements that the selection of the internal standard is limited. 20 As a result, Rh and Yb were selected as internal standard elements because they do not react with O2. 20 The signal counts of As + and its molecular ions were measured for As(III) and As(V) solutions with 0, 0.3, 0.6 and 1.0 mL min -1 of O2 gas flowing into the reaction cell.…”

“…19 In order to understand the mechanism of the effect of O2 gas, we investigated the enthalpy change (ΔH) of the reaction between the As-related ions and O2 using theoretical calculations. 20 When reactants of A and B react with the products of C and D, the chemical reaction behaves according to Eq. (1).…”

“…We previously reported the reaction process of oxygenation of As + by O2 in ICP-DRC-MS. 20 In this paper, we discuss the effectiveness of the use of O2 to suppress the IMF effect in ICP-DRC-MS.…”

The Effect of Plasma Reactions on Arsenic Measurement by ICP Spectrometry

“…The oxygenation of elemental ions (M + ) in the DRC was investigated experimentally, and a new explanation for selective oxygenation based on the enthalpy changes (ΔH) in the oxygenating reactions is proposed. 48 The enthalpy changes of each M + were calculated and the possibility of each reaction occurring was evaluated. We discussed the mechanism of selective oxygenation of ions in dynamic reaction cell ICP-MS based on the thermochemistry of the reaction.…”