Table 1. Physicochemical properties of the studied antibiotics.

Antibiotics	Class	Water solubility	LogKow	Koc	pKa	Use d
		20°C (mg L-1)		(L kg-1)		(%)
Sulfamethoxazole a	Sulfonamides	2800	0.89	219	5.8; 1.4	41
Sulfadiazine	Sulfonamides	77 b	-0.09 b	124 c	6.36 b	17
Trimethoprim a	Diaminopyrimidines	1000	0.59	301	7.0	41
Enrofloxacine a	Fluoroquinolones	100	2.32	2179	6.4; 7.8	47

^a : [25];

^b : [26];

^c : [5]

^d: field survey, 2011–2012

K_ow: octanol-water partition coefficient; K_oc: soil organic carbon—water partition coefficient; pKa: acid dissociation constant