POPs have been studied for their intrinsic tendency to global persistence and mobility (Long Range Transport, LRT) by applying multivariate methods (Principal Component Analysis and Multicriteria Decision making) and QSAR modelling, both by classification and regression models. A Global Half-life Index (GHLI) useful for the preventive screening and ranking of possible POPs, even before the synthesis, has been defined (ES&T, 2007).
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