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A sample Introduction system Is described that extends the analytical capability ol the Inductively coupled argon plasma (ICAP)/polychromator to Include the simultaneous determination of six elemental hydrides along with a variety of other elements In foods. Detection limits for As, BI, Sb, Se, and Te

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A Beenakker, 3/4-Evenson, V4-X Evenson, and 3/4-Broida cavity were successively used to couple microwave power (2450 MHz) to an Ar/He or He plasma at atmospheric pressure. The suitability of each plasma as a spectral excitation source for the simultaneous spectrometric analysis of As, Ge, Sb, and Sn was evaluated. Though detection limits(1 ppb at 3 ) and linear dynamic ranges (102) were similar, the pure He plasma sustained in the Beenakker cavity proved to be the easiest to tune and operate plus It provided the most reproducible results. These results are comparable to those obtained by other methods.

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