“…In another such study, "lais team demonstrated that it is possible to atain removal eiciencies of 4 3% for Cu and from 43 to 63% for Zn, whereas a removal yield of 2% was measured for total P"Hs [40,41]. The results were improved replacing cocamidopropyl betaine with cocamidopropyl hydroxysultaine (up to 0% P"Hs and Pb removal, in three diferent polluted soil types) [42]. "y carefully choosing the acidic species (hydrochloric, nitric, sulphuric and lactic acids and ethanol) for leaching metals from soil in combination with non-ionic, ionic and amphoteric surfactants, "lais and co-worker studied the simultaneous removal of heavy metals and pentachlorophenol by lotation [43].…”