Sampling and determination of boron in the atmosphere

Atmospheric boron has been separated into gaseous and particulate components simultaneously for the first time by passing air through a simple impregnated filter sampling system. A Nuclepore filter for particulate boron collection preceded KOH impregnated Whatman 41 filters for gaseous boron collection. The filters were contained in a single 47-mm filter holder. Boron was determined by visible spectrophotometry with 2,4-dinitro-1,8-naphthalenediol (DNNDO) and brilliant green. Results obtained during field use at a variety of sampling sites around the United States reveal that the gaseous fraction is the major (> 96%) phase of atmospheric boron and suggest that much of the gaseous fraction of boron may exist as B(OH)/sub 3/. The ease, precision, and low detection limit of the DNNDO method for boron analysis are ideally suited for use with impregnated filter collection of boron, and the DNNDO method allows short time scale (daily) variations of atmospheric boron to be measured. 1 figure, 5 tables.

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