Method for reducing interferences in the analysis of substances

Details Method for reducing interferences in the analysis of substances Method for reducing interferences in the analysis of substances

1990-08-29

1991-10-08

Hill, Jr., Robert J.

Chemistry: analytical and immunological testing

Automated chemical analysis

With a continuously flowing sample or carrier stream

436 73, 436 80, 436 84, 436175, 436182, G01N 3508

Patent

active

050554093

ABSTRACT:
Unsegmented, continuous flow analysis, FIA, has been modified for automated measurement of the amounts of metal and metalloids with volatile hydrides. The sample is injected into a continuous carrier flow of acid, and upon reaction with sodium borhydride in a mixing coil, a gaseous hydride is generated which is blown with a gas flow to a detector, preferably an electrically heated quartz tube, and the atomic absorption is measured. The chemical interferences from other substances have been eliminated to a substantial degree by kinetic discrimination. Samples of about 1-100 nanograms can be determined at a rate of 180 samples per hour and with a detection limit in the sub-ng range.

REFERENCES:
patent: 4022575 (1977-05-01), Hansen et al.
patent: 4039385 (1982-01-01), Harada et al.
patent: 4224033 (1980-09-01), Hansen et al.
patent: 4230665 (1980-10-01), Huber
patent: 4314824 (1982-02-01), Hansen et al.
patent: 4391776 (1983-07-01), Braun
patent: 4399225 (1983-08-01), Hansen et al.
Pierce et al., Applied Spectroscopy, vol. 30, No. 1, pp. 38-42, 1976.
Hawley, Condensed Chemical Dictionary, 8th Ed., van Nostrand, N.Y., 1971.

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