Photodegradation is one of the processes that pesticides may undergo once dispersed in the environment. It requires an adequate overlapping between the emission spectrum of the light source and the absorption spectrum of the compound to be degraded. When such condition is fulfilled, molecules undergo light absorption, being promoted to an excited electronic state, from where they can relax via ...

The hockey stick regression method is a convenient method to estimate safe doses, which is a kind of regression method using segmented lines. The method seems intuitively to be useful, but needs the assumption of the existence of the positive threshold value. The validity of the assumption is considered to be difficult to be shown. The alternative methods which are not based on the assumption, ...

The field of gas phase photochemistry has progressed explosively in the past few decades due to the development of ultra fast high power lasers. Unique properties of lasers such as monochromaticity, coherence, tunability over a wide wavelength range and high intensity makes them a powerful pump and probe tool for a number of spectroscopic as well as photochemical studies like laser induced fluo...

The method of photochemical indicators is a way to evaluate the sensitivity of O3 to its two main precursors, nitrogen oxides (NOx) and reactive organic gases (ROG), directly from ambient measurements. The method is based on identifying measureable species or species ratios that are closely associated with O3-NOx-ROG predictions in photochemical models. Several species of this type have been id...

A series of photochemical reactions are assessed under the environmental aspect by using Eissen and Metzger’s EATOS (environmental assessment tool for organic syntheses) method and are compared with strictly analogous thermal processes. These include C–C bond-forming reactions (arylation and alkylation) and selective oxidation and reduction reactions. In most cases, the photochemical method is ...