摘要:

This review consists of three main parts. After a short discussion of the theory of photochemistry, the three major mechanisms (radiative, short range and long range) for the transfer of electronic excitation energy from sensitizers (donors) to substrates (acceptors) are described. Criteria for the selection of. sensitizers are a high efficiency of intersystem crossing (in the case of triplet sensitization) and energy transfer, and strong absorption at wavelengths longer than those at which the acceptor absorbs. Two mechanisms of sensitized photo‐oxygenation,viz.the radical and singlet oxygen type, are discussed.

ISSN:0092-9867    

DOI:10.1080/02772247909356931

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The most important constituents of traffic exhaust are carbon monoxide, nitrogen oxides, volatile organic compounds, polycyclic hydrocarbons and lead. Satisfactory analytical methods are available for measuring these compounds, but the required expenditure in their application to air pollution studies is quite different. Due to correlations between the concentrations of several exhaust components in road air conclusions regarding the expected level of some substances can be drawn by measurement of another emitted compound. But the selection of indicator compounds must be made under the aspect of the source‐specific relationship of emitted substances. The temporal and spatial distribution of air pollutants in street air is affected by traffic emissions more than by meteorological conditions. “Fingerprints”; of typical organic gaseous components of traffic exhaust also were found in residential areas.

ISSN:0092-9867    

DOI:10.1080/02772247909356932

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Specific usage of neutron activation analysis, charged particle analysis,yphotons analysis, G.C.M.S. coupling, stable isotope dilution techniques, are discussed.

ISSN:0092-9867    

DOI:10.1080/02772247909356933

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

ISSN:0092-9867    

DOI:10.1080/02772247909356930

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor