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- W2000786196 abstract "Abstract A light weight electron capture, gas chromatograph has been laboratory- and field-tested to conduct surface and airborne PAN measurements in the unpolluted troposphere. A dynamic calibration system based on CH3CHO/NO2/Cl2 photolysis studies by Gay et al. (1976) was constructed and successfully tested. PAN was cryogenically preconcentrated prior to analysis. A sensitivity of 5 parts per trillion (ppt) and an overall accuracy of ± 20 % is estimated. It is shown that gas phase coulometry (GPC) is unsuited for absolute PAN analysis—principally, because a significant fraction of PAN is destroyed prior to coulometric detection. The kinetics of this destruction process are nonlinear. PAN measurements at a marine Pacific site, and aboard an aircraft, show that PAN is always present at a concentration range of 10–100 ppt, although concentrations as high as 400 ppt were measured at an altitude of 4.6 km over the Pacific Ocean. Surface PAN measurements at a Pacific marine site indicate a distinct diurnal behavior, tentatively attributed to photochemistry involving alkenes, alkanes and NOx. There was no evidence of PAN diurnal variation in the free troposphere, but the data are currently too sparse. Measurements in the global atmosphere are needed to accurately describe the distribution and the role of PAN in the chemistry of the natural atmosphere." @default.
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- W2000786196 date "1983-01-01" @default.
- W2000786196 modified "2023-09-27" @default.
- W2000786196 title "Methodology for the analysis of Peroxyacetyl nitrate (PAN) in the unpolluted atmosphere" @default.
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- W2000786196 doi "https://doi.org/10.1016/0004-6981(83)90304-9" @default.
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