Algebraic topology: a primer by Deo S.

By Deo S.

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NO2 is then determined by difference between the NOx and NO channels. There is some potential for interference in the NOx channel (and hence in the NO2 measurement) from species such as nitric acid. Detection limits for most commercial instruments are of the order of 1 mg m À 3, although higher-sensitivity instruments are available. In recent years, instruments capable of measuring NO and NO2 at background (ng m À 3) levels have been developed, based upon the NO/O3 reaction and also the NO2/luminol chemiluminescent reaction.

Oxford: Blackwell. Workplace Air J Yu and R M A Hahne, University of Washington, Seattle, WA, USA & 2005, Dow Chemical Company. Published by Elsevier Ltd. All Rights Reserved. Introduction As a basis for the prevention and control of occupational hazards, workplace air analysis has undergone rapid development in the field of analytical science during the last two decades. It paralleled the establishment and development of occupational exposure guidelines for hazardous materials set by government/advisory agencies.

Interferences are negligible and the observed detection limits are B1 ppb in commercial instruments. The preferred technique for ambient air is UV light absorption in a folded path cell at 254 nm. Detection limits are B1 ppb. , aromatic hydrocarbons). This is overcome by cycling the instrument between two modes: in one the absorbance of air passing through an ozone scrubber is measured, while in the other mode the absorbance of unscrubbed air is determined. The difference is due to the absorption by ozone.

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