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

Table 5

Seasonal variations in OCP residues in water and sediment samples.

OCPs in water					OCPs in sediment
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
α-HCH	<0.01	<0.01	N/A	N/A	<0.01	<0.01	N/A	N/A
β-HCH	<0.01	<0.01	N/A	N/A	<0.01	<0.01	N/A	N/A
δ-HCH	<0.01	0.059 ± 0.24	−1.062	0.296	<0.01	0.004 ± 0.12	N/A	−1.00
γ-HCH	<0.01	0.002 ± 0.01	−1.000	0.324	<0.01	0.003 ± 0.01	0.037 ± 0.13	−1.10
Heptachlor	<0.01	<0.01	N/A	N/A	<0.01	<0.01	N/A	N/A
Aldrin	<0.01	<0.01	N/A	N/A	<0.01	0.001 ± 0.01	N/A	−1.00
Chlordane	<0.01	<0.01	N/A	N/A	<0.01	<0.01	N/A	N/A
α-Endosulfan	<0.01	<0.01	N/A	N/A	<0.01	<0.01	N/A	N/A
β-Endosulfan	<0.01	<0.01	N/A	N/A	<0.01	<0.01	N/A	N/A
Dieldrin	<0.01	<0.01	N/A	N/A	<0.01	<0.01	N/A	N/A
Endrin	<0.01	<0.01	N/A	N/A	<0.01	<0.01	N/A	N/A
p,p-DDT	<0.01	<0.01	N/A	N/A	<0.01	<0.01	N/A	N/A
p,p-DDE	<0.01	<0.01	N/A	N/A	<0.01	<0.01	N/A	N/A

N/A means not applicable; <0.01 means lower than the limit of detection