would be effective for the analysis of samples of similar complexity.Registry No. Ga, o-HOC6H4CH=NNHC (S)-

CONCLUSIONSThe combination of hydride generation with subsequent trapping in the graphite furnace provides a rapid, simple, accurate, and precise method for the determination of Se in a variety of environmental samples. Utilization of the furnace as an atomization cell is advantageous in that a single system can be used for both hydride samples and conventional aqueous samples. This technique should prove suitable for other hydride-forming elements and thus offers the potential for multielement capability. Ringdal. 0.; Slinning, K.-E.; Braekkan, 0. R. Spectrochlm. Acta, Part 8 1982, 378, 473-482. Verlinden, M.; Deelstra, H.; Adriaenssens, E. Talanta 1981, 2 6 , 637-846. Raptis, S. E.; Kaiser, G.; Tolg, G. Fresenius' Z . Anal. Chem. 1983, 316, 105-123. Piwonka, J.; Kaiser, G.; Tolg, G. Fresenlus' 2. Anal. Chem. 1985, 321, 225-234. 918-926.

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Methods are described for the determination of total As in sea water and in marine tissues and sediments based on the generation of AsH3 using NaBH4 with its subsequent trapping in a graphite furnace at 600 "C. Calibration is achieved with a simple aqueous calibration graph having a sensitivity of 0.18 k 0.03A ng-1 and yields an absolute detection limit of 40 pg. Sample volumes of 10-500 pl produce total method concentration detection limits (3a blank) of 60 pg 9-1 in sea water, 0.2 pg g-1 in sediments and 0.15 pg 9-1 in tissues.Corresponding precisions of 2-3% are typical for analyses of these samples. Results are reported for the determination of As in a suite of marine reference materials.