Development and Characterization of an Automated Direct Sample Insertion/Inductively Coupled Plasma/Atomic Emission Spectrometry System

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Abstract:

A new direct sample insertion (DSI) device that can be used vertically with inductively coupled plasma atomic emission spectrometry (ICP-AES) or horizontally with IC P mass spectrometry (IC P-MS) has been designed, and an automated ICP-AES system has been developed around this DSI device. The automated DSI-ICP-AES system was characterized by using microliter volumes of liquids and milligram amounts of powders. Analysis of solids with minimum pretreatment was a key goal in developing this system, and several calibration methods for powders were investigated. Examples of these are liquid standards, a few milligrams of different reference material or a different weight of the same material and standard additions of liquids onto a powder in the cup. Sample handling, weighing, sampling, and homogeneity concerns were partially addressed by using slurries. In addition, slurry DSI-ICP-AES for botanical, geological, and biological powdered reference materials is briefly described. Carbide formation is a key chemical limitation of graphite-cup DSIs, and it was addressed by using in situ chemical modification by mixing SF6 with the plasma gases.

Keywords: DIRECT SAMPLE INSERTION; ICP-AES AUTOMATION SOLIDS SLURRIES C HEMICAL MODIFICATION

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702991946325

Publication date: February 1, 1999

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