Direct solid sampling for analysis with inductively coupled plasma using a novel electronic spark source

Abstract

A solid sampling accessory, using a spark discharge for introduction of analyte material into an inductively coupled plasma (ICP) torch, has been developed. The device uses a novel electronic design which results in a dramatic simplification of the hardware compared with previously described arrangements. A simple cell consisting of a tungsten electrode adjacent to the sample in a flowing inert gas atmosphere completes the unit as an extremely compact benchtop accessory. This device has been optimized for stable operation over a minimum of 12 min; relative standard deviations for signals over that period are typically ⩽3%. Precisions of ⩽4% were found for the determination of trace elements in National Institute of Standards and Technology Standard Reference Materials with limits of detection in the single digit ppm range.