Direct powder injection of NBS coal fly ash in inductively coupled plasma atomic emission spectrometry with rapid scanning spectrometric detection

A simple device is described to introduce powder as a pulse into an ICP (inductively coupled plasma). A tangential argon flow created inside the device (volume approx. 0.3 mL) mixes and carries the powder into the ICP. A 2-kW forward power with 20 L min/sup -1/ coolant argon flow ICP is sufficient for excitation. (The reflected power is less than or equal to 5 W with or without the powder entering the autotuned plasma). Transient elemental emissions obtained from 0.5 to 2.5 mg of NBS Coal Fly Ash (1633a) are monitored by using a rapid scanning spectrometer. Detection limits for Cr, Sr, Tl, V, Cu, and Zn in the coal fly ash are in the nanogram level (1, 5, 7, 3, 2, and 2, respectively). Reproducibilities for these elements are less than or equal to 12% RSD. Acceptable recoveries for diluted coal fly ash indicate the potential for using NBS SRM's as standards for similar matrix samples. Elemental emissions have been observed from all powders attempted (silicon carbide, powdered whole blood, tomato vegetable dust, and granular chromatographic grade cellulose. 15 references, 7 figures, 3 tables.

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