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

Table 1

Mean, minimum, and maximum concentrations (ng L⁻¹) and frequency of detection (%) for the nineteen most frequently detected pesticides and metabolites.

Pesticides	Concentration (ng L^−1)			% detection
	Mean	Min	Max
Insecticides
Diazinon	19.0	<LOD	70.3	78.6
Fenthion	11.1	<LOD	84.1	52.6
Methidathion	4.5	<LOD	26.7	42.2
Pirimiphos methyl	12.4	<LOD	83.5	40.1
Dichlorvos	8.0	<LOD	66.4	39.1
Malaoxon	5.5	<LOD	80.6	35.4
Chlorpyrifos	12.2	<LOD	101.2	31.8
Chlorpyrifos methyl	7.1	<LOD	77.1	31.3
Parathion methyl	6.5	<LOD	66.2	29.7
Dimethoate	3.0	<LOD	45.1	21.4
Herbicides
Atrazine desethyl	56.1	<LOD	316.9	69.3
Atrazine	18.4	<LOD	288.3	42.7
Alachlor	18.7	<LOD	213.5	50.0
Trifluralin	14.3	<LOD	237.0	28.1
S-Metolachlor	2.0	<LOD	20.5	24.5
Fungicides
Penconazole	21.2	<LOD	227.1	43.2
Cyproconazole	51.1	<LOD	724.1	31.8
Triadimefon	10.8	<LOD	192.3	40.1
Pyrazophos	1.4	<LOD	32.7	17.2