The principal objective of this work has been to assess the quantitative importance of homogenous and heterogeneous photochemistry as a sink of pollutants in the aquatic environment. Using a combination of chemical trapping techniques, steady-state and time-resolved spectroscopic methods and product analysis, we have examined the mechanisms and magnitude of the photochemical production of stron...

An important tool in the management of photochemical smog episodes is a computational model which can be used to test the effect of possible emission control strategies. High spatial resolution of such a model is important to reduce the impact of numerical errors on predictions and to allow better comparison of the model with experimental data during validation. This paper therefore presents th...

By combining a high frequency modulation system for measurement of fluorescence with a phosphoroscope type apparatus for measurement of luminescence, recordings of fluorescence and luminescence induction kinetics under identical conditions were obtained. Both measuring sys­ tems tolerated the application of saturating pulses of white light for rapid, transient elimination of photochemical quenc...

Steady-state and time-resolved emission spectroscopy are valuable tools to probe photochemical processes of metal-ligand, coordination complexes. Ru(II) polyazine light absorbers are efficient light harvesters absorbing in the UV and visible with emissive ³MLCT excited states known to undergo excited state energy and electron transfer. Changes in emission intensity, energy or band-shape, as wel...

BACKGROUND Epidemiologic and experimental studies have reported a variety of health effects in response to ozone (O3) exposure, and some have indicated that certain populations may be at increased or decreased risk of O3-related health effects. OBJECTIVES We sought to identify potential response-modifying factors to determine whether specific groups of the population or life stages are at inc...

A lifecycle environmental impact analysis was conducted for SF6 used as an insulating gas in electrical devices. Eight scenarios with different forms of usage as an insulating gas (pure SF6 and gaseous mixture of SF6 with nitrogen) and treatment processes of waste SF6 (e.g., reproduction after decomposition, reuse after purification) are assumed. Energy consumption and emission of pollutants an...

The functionalization of heteroarenes has been integral to the structural diversification of medicinally active molecules such as quinolines, pyridines, and phenanthridines. Electron-deficient heteroarenes are electronically compatible to react with relatively nucleophilic free radicals such as hydroxyalkyl. However, the radical functionalization of such heteroarenes has been marked by the use ...