Abstract
Three capillary columns were studied for the determination of peroxyacetyl nitrate, peroxypropionyl nitrate and some alkyl nitrates of atmospheric importance. Two non-polar HP-1 100% dimethyl polysiloxane columns, of 0.53 and 0.32 mm I.D., yielded the best resolution of all compounds studied. The intermediate polarity HP-17 50% methyl-50% phenyl polysiloxane wide-bore column could not resolve peroxypropionyl nitrate from 2-butyl nitrate. Compared with capillary columns with polar Carbowax satisfactory phases, the columns studied gave a better resolution of peroxyacetyl nitrate and peroxypropionyl nitrate, and there was no interfering water peak. Alkyl nitrates could be determined simultaneously. Detection limits were in the low ppb range.
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