Seasonal Changes in Pesticide Residues in Water and Sediments from River Tano, Ghana

Table 3

Seasonal variations in OP pesticide residues in water and sediment samples.

OPs in water samples				OPs in sediment samples
Pesticides	Group means ± SD (μg/L)				Group means ± SD (mg/kg)
	Dry season	Rainy season	t value	value	Dry season	Rainy season	t value	value
Parathion	0.027 ± 0.02	0.268 ± 0.01	−2.34	0.031	0.013 ± 0.04	0.035 ± 0.03	−2.34	0.028
Methamidophos	0.238 ± 0.04	0.241 ± 0.03	−0.02	0.985	0.009 ± 0.01	0.039 ± 0.01	−3.20	0.004
Diazinon	0.024 ± 0.01	0.063 ± 0.05	−1.57	0.127	0.023 ± 0.01	0.023 ± 0.02	0.034	0.973
Fenitrothion	0.021 ± 0.02	0.134 ± 0.04	−1.49	0.154	0.027 ± 0.05	0.052 ± 0.04	−1.26	0.220
Malathion	0.131 ± 0.05	0.303 ± 0.01	−1.07	0.294	0.027 ± 0.02	0.036 ± 0.01	−0.436	0.666
Chlorpyrifos	0.148 ± 0.03	0.383 ± 0.01	−1.32	0.200	0.017 ± 0.00	0.021 ± 0.03	−0.517	0.608
Profenofos	0.074 ± 0.04	0.303 ± 0.07	−1.83	0.079	0.026 ± 0.01	0.021 ± 0.02	0.423	0.673
Pirimiphosmethyl	0.188 ± 0.14	0.309 ± 0.01	−0.62	0.539	0.013 ± 0.04	0.035 ± 0.03	−2.34	0.028

means the seasonal difference is statistically significant ( < 0.05)