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• W2015280003 abstract "Abstract A fast response analyzer for HNO 3 in highly polluted air is described. The time resolution attainable was 12 s. The method is based on the difference in a technique for HNO 3 -scrubbed and non-scrubbed air and the reduction of HNO 3 to NO with the use of a line of catalytic converters and a method for the subsequent NO-ozone chemiluminescence. A sample air stream, in which particulates are removed with a Teflon filter, is divided into two channels. CH-1 is directly connected to the converter line, and CH-2 contains a HNO 3 scrubber packed with a nylon fiber that goes to another converter line. Each converter line is composed of a hot quartz-bead converter (QBC) and a molybdenum converter (MC) in a series. A QBC reduces HNO 3 to (NO+NO 2 ), which is called NO x . The MC reduces the NO x to NO. For CH-1, the analyzer detects most compounds that typically comprise NO y (J. Geophys. Res. 91 (1986) 9781). These CH-1 compounds are called NO y ′ hereafter (NO y -particulate nitrate) because the particulates are removed by the filter. A difference in the detector signal for the two channels indicates HNO 3 . For a blank test, atmospheric air in which HNO 3 was pre-scrubbed by an extra nylon fiber was introduced to the analyzer. Variations in the blank value were 0.38±0.42 and 0.34±0.55 ppb during the high readings (NO y ′-HNO 3 ) (called NO y * hereafter) (111±12 ppb, N =180), and low NO y * readings (62±8 ppb, N =180), respectively, indicating that the lowest detection limit of the analyzer is 1.1 ppb (2 σ ). When the data obtained with the analyzer is compared to the data using the denuder method, a linear correlation with the regression of Y =0.973 X +0.077 ( r 2 =0.916 ( N =20)) in the range of 0–6.5 ppb HNO 3 is obtained, which is an excellent agreement. Atmospheric monitoring was carried out at Kobe. Although the average concentration of HNO 3 was 2.6±1.3 ppb, ca.10 ppb for a HNO 3 concentration was occasionally observed when the NO y * concentration was high, i.e., more than 100 ppb." @default.
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• W2015280003 date "2001-11-01" @default.
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• W2015280003 title "HNO3 analyzer by scrubber difference and the NO–ozone chemiluminescence method" @default.
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• W2015280003 doi "https://doi.org/10.1016/s1352-2310(01)00297-7" @default.
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