... number of studies (Raksasataya et al., 199 6; Hall, 199 8; Gray et al., 199 8; Lo and Yang, 199 8; Bunzl et al., 199 9; Gomez-Arizaet al., 199 9, 2000; Ho and Evans, 2000) that during the leaching ... (Li et al., 199 5; Bajc, 199 8; Hall, 199 8; Yeager et al., 199 8;Gray et al., 199 9; Turner and Olsen, 2000), but reproducibility of the datahas been highlighted as a problem (Hall, 199 8). Hence ... al., 199 7; Lopez-Sanchez et al., 199 8; Sahuquillo etal., 199 9, 2000; Rauret et al., 199 9). Although reproducible for this material,it is not clear that the procedure will be suitable for all soil...