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mitted to an HP 85B computer, which performed intermediate concentration calculations and displayed a real time running plot of the Be data vs. depth. This procedure was extremely useful, enabling rapid identification of samples with suspect values and allowing immediate reinjection of the extracts. Full listings of both the integrator and computer programs are available from the authors. CONCLUSIONThe method outlined above is part of a continuing program aimed at developing and adapting analytical techniques for trace element determinations in natural waters. The techniques are developed to allow geochemical cycles to be delineated for elements where atomic absorption lacks sensitivity. For elements where other methods are available, ECD-GC of volatile chelates provides considerable advantages both in terms of sensitivity, lowering sample volume requirements and the associated collection problems, and suitability for use at sea. Currently the range of elements that have been determined at sea with this approach is Se (10) by 4-nitro-ophenylenediamine and Be, Al, and Cr by Htfa. The last two will be reported later. ACKNOWLEDGMENTWe wish to thank the Chief Scientist, Dean Roemmich, and the entire complement of the R.V. Thomas G. Thompson for both the opportunity to participate in, and their help throughout, the trans-Pacific cruise. Ed Boyle provided helpful comments on the paper as well as many useful sug-58, 2060-2072 2089 0 ID88 American Chemical Society