Platinum-selective capillary gas chromatographic determination with microwave-induced plasma atomic emission detection

Abstract

The volatile platinum(II) complex of N, N-ethylenebis(5,5-dimethyl-4-oxohexane-2-imine) (H 2APM 2en) eluted quantitatively from a GC capillary column and has been used to establish operating parameters and to gain figures of merit for atomic emission detection of platinum with microwave-induced plasma atomic emission. Two recipes have been developed for platinum; at 266 nm for simultaneous monitoring the carbon emission at 248 nm, and at 300 nm for simultaneous determinations with copper and nickel at 325 nm and 301 nm, respectively. Optimum platinum emission was observed using oxygen and hydrogen as reagent gases and high flow-rate of helium as make-up gas. Linear calibration ranges at 266 nm and 300 nm were assessed and, platinum emission being approximately five-times more sensitive at 300 nm than at 266 nm. The detection limit at 300 nm was observed as 65 pg/s. Selectivity of platinum emission over carbon at both wavelengths 266 nm and 300 nm is in the range of 10 5–10 6.