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

Table 5

Annual mean concentration and standard error (ng L⁻¹) of nineteen selected pesticides for each year of the sampling period (2005–2007).

(a)  

	Fungicides (ng L^−1)				Herbicides (ng L^−1)
	Triadimefon	Pyrazophos	Penconazole	Cyproconazole	Atrazine	Trifluralin	S-Metolachlor	DEA	Alachlor
2005	20.9±2.31^b	4.07±0.78^b	42.3±8.69^c	11.5±2.65^a	40.9±7.68^b	20.8±3.12^b	5.32±0.65^b	57.1±8.26^b	36.7±4.81^b
2006	5.54±0.96^a	1.79±0.29^a	3.26±0.81^a	130±25.9^b	13.8±3.72^a	22.8±7.28^b	1.87±0.50^a	27.4±4.79^a	5.77±1.18^a
2007	9.91±3.57^a	1.16±0.14^a	22.1±4.52^b	25.3±6.87^a	5.38±1.38^a	1.79±0.56^a	0.60±0.04^a	78.8±12.2^b	12.2±2.20^a

(b)

	Insecticides (ng L^−1)
	Dichlorvos	Parathion methyl	Chlorpyrifos	Malaoxon	Dimethoate	Diazinon	Fenthion	Pirimiphos methyl	Chlorpyrifos methyl	Methidathion
2005	16.0±2.37^c	13.7±2.31^c	35.5±4.49^b	8.48±1.27^b	6.14±0.91^b	19.4±1.40^b	28.9±3.37^b	25.8±3.62^b	18.4±2.83^b	4.98±0.77^b
2006	1.48±0.21^a	8.05±1.62^b	3.73±0.70^a	2.73±0.67^a	5.44±1.16^b	11.3±1.12^a	6.44±1.02^a	10.1±3.04^a	2.65±0.54^a	2.48±0.5^a
2007	9.61±1.78^b	1.21±0.12^a	1.96±0.57^a	6.93±2.15^b	1.70±0.38^a	31.0±2.36^c	2.56±0.52^a	6.08±1.68^a	1.48±0.34^a	5.24±0.77^b

Different letters indicate significant differences at significance level P < 0.05 for each year separately of the total sampling period of three years (2005–2007).