Table 3.

Hazard quotients derived for amoxicillin, enrofloxacin, and neomycin.

Pharmaceuticals	MECmean (µg/L)	MECmax (µg/L)	Lowest NOEC (mg/L)	AF	PNEC (µg/L)	HQ Based on MECmean	HQ Based on MECmax
Amoxicillin	0.068	1.654	0.00078 b	10	0.078	0.87	21.2
Enrofloxacin	0.087	30	0.049 c	10	4.9	0.018	6.1
Neomycin	1.18	1.18 a	0.03 d	10	3.0	0.39	0.39

^a The same value as MEC_mean was used because MEC_max was not available. ^b Based on the Synechococcuse leopoliensis 96-h growth NOEC [19]. ^c Based on the Microcystis aeruginosa 5-d growth EC₅₀ in the literature [44]. ^d Based on the Daphnia magna 21-d survival NOEC [12].