... 153skeletonwithacarboxylicacidatposition3,ketogroupatposition4,andabasicN-moiety at position 7. 36 38Gu and Karthikeyan39examined the binding of cipro-oxacin (CIP) (pKa1 =6. 16, pKa2=8 .62 )toAl-andFe-hydrousoxides.CIPisanimportant third-generation ... their release into the environment. Over a 180-d anaerobicincubation in liquid swine manure, rst-order half-lives were estimated for erythro - mycin,roxithromycin,andsalinomycinof41d,130d ,and6 d,respectively,whereasnodegradationoftiamulinwasobserved.51 The ... oxidativelytransformuoroquinolones,albeitatratesapproximatelythreeordersofmagnitudelowerthanMnO2,reectingthelowerredoxpotential(0 .63 V)ofthemineral. 60 6. 4 HORMONES 6. 4.1 SORPTION BY SOIL AND SEDIMENT The occurrence of natural and synthetic estrogens and androgens in surface watershas...