Spatiotemporal Variation and Risk Assessment of Pesticides in Water of the Lower Catchment Basin of Acheloos River, Western Greece

Table 6

Environmental risk of pesticides detected in Acheloos River as risk quotient (MEC/PNEC) based on median and maximum residue values for 2005 and 2007.

Pesticide	PNEC (𝜇g L^−1)	Assessment factor	RQmedian	RQmax	RQmedian	RQmax
			2005		2007
Dichlorvos	0.0038	50	2.21	17.47	0.53	12.63
Parathion methyl	0.0073	1000	0.25	9.07	0.27	0.96
Triadimefon	0.34	50	0.05	0.22	0.01	0.57
Chlorpyrifos	0.014	10	1.71	7.23	0.14	2.41
S-metolachlor	15.6	50	0.0003	0.001	0.0001	0.0001
Malaoxon	0.003	50	1.90	17.83	0.67	26.87
Pyrazophos	0.0036	50	0.28	9.08	0.28	2.61
Dimethoate	4	10	0.001	0.01	0.001	0.01
Diazinon	0.056	10	0.36	0.73	0.53	1.26
Penconazole	1.2	50	0.002	0.19	0.01	0.15
Fenthion	0.0057	1000	3.33	14.75	0.18	4.33
Atrazine desethyl	0.72	1000	0.06	0.44	0.05	0.44
Alachlor	2	10	0.02	0.11	0.002	0.05
Cyproconazole	2	10	0.002	0.04	0.002	0.12
Atrazine	10	10	0.003	0.03	0.0002	0.01
Trifluralin	0.5	10	0.04	0.23	0.01	0.04
Pirimiphos methyl	0.0016	50	16.28	50.67	0.63	41.15
Chlorpyrifos methyl	0.001	10	10.00	77.11	1.08	19.61
Methidathion	0.0132	50	0.15	2.02	0.15	1.90