By Wolfgang Jaeschke (auth.), H. W. Georgii, W. Jaeschke (eds.)

ISBN-10: 9400979185

ISBN-13: 9789400979185

ISBN-10: 9400979207

ISBN-13: 9789400979208

The content material of this booklet are lectures and examine papers offered on the NATO complex examine Institute on -Chemistry of the Unpolluted and Polluted Troposphere-held from September 28 to October 10, 1981, at the Island of Corfu, Greece. the belief of the clinical occasion was once made attainable through the sponsorship of the NATO clinical and Environmental Affairs department. We needs to exhibit our gratitude first to this establishment for the $64000 guidance and cooperation we bought. for extra information we're a lot obliged to our amazing co sponsors: Carl Zeiss Werk, Oberkochen, FRGj Biotronik GmbH, Frankfurt, FRGj Bodenseewerk Perkin Elmer u. Co GmbH, Ueberlingen, FRGj and TSI Deutschland Inc., Aachen, FRG. To Mr. Dimitris Bouas, the Director of the Grand inn Glyfada, we wish to specific our thank you and appreciation for the superb providers. the heart of Environmental safeguard of the college of Frankfurt, FRG, performed the NATO complex learn Institute end result of the swiftly elevated curiosity within the difficulties of air chemistry and pollution. This improvement has contributed in recent times to an important enlargement of information within the box of atmospheric chemistry, the place a number of of the vintage disciplines like meteorology, physics and chemistry have joined in mixed examine. The complex examine Institute provided an awesome chance to provide a complete survey of the current wisdom during this quite new box of atmospheric science.

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Extra info for Chemistry of the Unpolluted and Polluted Troposphere: Proceedings of the NATO Advanced Study Institute held on the Island of Corfu, Greece, September 28 – October 10, 1981

Example text

The method is sensitive to fog and to high amounts of S02, since the spectrum of S02 covers the bands of N02. The lower limit of detection depends on the length of the light path and on the visibility. HELAS be attained. Thus the method is useful for determining N02 in continental background air. For more contaminated air the length of the light path must be reduced correspondingly. Electron spin resonance The ESR-technique is a powerful tool for the detection and measurement of atmospheric free radicals.

Liquid phase While in the coulometric method the gaseous compound is led into the measurement cell, where a wet chemical method is employed, the other methods collect the nitric acid and have a separate detection step. ) gas - phase (896 cm- 1 ) FTIR chemiluminescence of NO after conversion and subtraction 4 (1 km) 10- 2 see text Coulometry Spicer et al. [51,52] report the use of a micro-coulometric method to determine HN03 in the troposphere. The procedure is ba~ed on a Mast micro-coulomb meter adapted to permit detection of acidic gases [53].

The lower limit of detection of about 2 ppbv [12] is by far sufficient to measure ambient levels (about 300 ppbv) of nitrous oxide. Gas-Chromatography with Ultrasonic-Phase-Shift-Detector Other detection methods have also been put to use. Weiss et al. [13] describe the application of an ul trasonic phase shift (UPS) detector. This technique bases on the gas chromatographic separation of N20 and C02 that is cryosampled from about 2 1 of air. The ratio of the two signals is determined and calibration is obtained from an independent C02 determination by infrared technique.

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Chemistry of the Unpolluted and Polluted Troposphere: Proceedings of the NATO Advanced Study Institute held on the Island of Corfu, Greece, September 28 – October 10, 1981 by Wolfgang Jaeschke (auth.), H. W. Georgii, W. Jaeschke (eds.)


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