Argon ions reaction with oxygen

Results from initial ion trap ICP-MS experiments indicated that signals due to argon ions and many polyatomic ions were much smaller than expected [133]. Reactions between Ar+ and H2 result in formation of low-mass ions such as H+ and H3+ and Ar atoms [148,149]. Ar-containing polyatomic ions, such as ArO+, ArOH+, ArCl+, Ar0+, and ArC+, can also be removed by reaction with H2 or water vapor in a reaction cell [115,148,149]. Other gases, such as oxygen, may be useful reagents to remove other molecular ions. 

Pettier et al. (1992) studied the sonochemical degradation of pentachlorophenol in aqueous solutions saturated with different gases at 24 °C. Ultrasonic irradiation of solutions saturated with air or oxygen resulted in the liberation of chloride ions and mineralization of the parent compound to carbon dioxide. When the solution was saturated with argon, pentachlorophenol completely degraded to carbon monoxide and chloride ions, in aqueous solution, pentachlorophenol was degraded by ozone at a reaction rate of >3.0 x 10 /M-sec at pH 2.0 (Hoigne and Bader, 1983). 

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