Multielement Analysis of Selected Elemental Hydrides by Chromatographically Coupled Plasma Emission Spectrometry

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Abstract
An NaBH4/acid reaction was coupled via liquid nitrogen condensation and a Chromosorb 102 chromatographic column to a microwave induced plasma for the multielement analysis of As, Se, Sn, and Sb. The condensation allows separation of the analytes from hydrogen produced during the hydride generation reaction while the chromatographic column allows separation of analyte signal from spectral background caused by contaminants present in the system. ASH3, SeH2, SnH4, and SbH3 are simultaneously generated and upon reaching the microwave induced plasma, their atomic excitation is detected simultaneously by a 1.5 M direct reading emission spectrograph. Detection limits, relative precision, and linear ranges are compared with those determined in the single element mode using a 0.5 M monochromator. NBS orchard leaves were also examined to demonstrate the utility of the system. Potential utility of the system for sequential multielement analysis of Ge, As, Sb, and either Se or Sn using a single channel detector is also demonstrated.

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