Organochlorine Pesticide Residues in Sediments and Waters from Cocoa Producing Areas of Ondo State, Southwestern Nigeria

Table 4

Mean concentration (µg/g) of OCPs in sediment samples of some rivers in Ondo State during the dry season.

Analytes	Agoo	Ose	Ala	Oluwa	Ogbese	Oni	Aponmu	Osun	Opa	Owena-Osun	Owena-Ondo
HCB	1.89^b±0.05	ND	0.51^b±0.06	25.18^a±3.05	6.05^b±0.02	0.33^b±0.12	4.69^b±1.53	NS	NS	ND	0.04^b±0.03
α-BHC	5.03^b,a±0.02	ND	0.95^c±0.08	𝟎.𝟎𝟏^c±0.01	2.32^b,c±1.53	0.18^c±0.03	8.07^a±3.00	NS	NS	ND	0.05^c±0.01
β-BHC	4.60^b±0.22	0.51^b±0.77	3.26^b±0.05	𝟎.𝟎𝟏^b±0.01	0.10^b±0.06	1.31^b±0.06	10.91^a±6.66	NS	NS	ND	0.14^b±0.11
γ-BHC	4.05^b±0.01	ND	0.22^b±0.04	𝟎.𝟎𝟏^b±0.01	9.08^a±0.02	0.93^b±0.08	3.89^b±0.04	NS	NS	ND	0.05^b±0.01
Heptachlor	ND^b	ND	ND	ND	ND	ND	ND	NS	NS	ND	ND
Aldrin	6.55^a±0.02	ND	0.03^b±0.01	𝟎.𝟎𝟏^a±0.01	0.05^b±0.03	0.80^b±0.37	1.39^b±0.05	NS	NS	ND	0.10^b±0.07
Trans-chlordane	2.64^b±0.01	ND	3.80^b±0.03	81.32^a±7.06	0.26^b±0.06	0.47^b±0.11	2.88^b±1.53	NS	NS	0.58^b±0.08	0.39^b±0.06
Cis-chlordane	3.44^b±0.02	1.99^c,b±0.05	0.20^c±0.07	1.06^c,b±0.03	6.99^a±0.05	2.28^c,b±1.03	0.23^c±0.15	NS	NS	1.03^c,b±1.00	0.03^c±0.01
α-endosulfan	3.44^b±0.02	1.99^c,b±0.01	0.20^c±0.08	1.06^c,b±0.03	6.99^a±0.02	2.28^c,b±1.53	0.23^c±0.15	NS	NS	1.03^c,b±0.71	0.03^c±0.01
β-endosulfan	1.36^b±0.01	ND	5.84^a±1.00	7.04^a±0.02	1.98^b±0.01	0.80^b±0.69	0.09^b±0.07	NS	NS	𝟎.𝟎𝟏^b±0.01	0.08^b±0.02
p,p′-DDE	17.89^a±0.03	7.75^b±0.66	3.26^b±0.05	2.79^b±0.04	1.21^b±1.15	3.37^b±3.08	19.04^a±1.25	NS	NS	0.08^b±0.03	0.19^b±0.15
o,p′-DDD	3.12^b±1.09	ND	ND	11.15^a±1.36	0.09^b±0.03	0.25^b±0.09	9.54^a±4.10	NS	NS	𝟎.𝟎𝟏^b±0.01	0.09^b±0.07
p,p′-DDD	2.05^b±0.01	ND	7.05^b±0.13	57.40^a±6.76	0.06^b±0.05	1.54^b±1.36	0.74^b±0.16	NS	NS	𝟎.𝟎𝟏^b±0.01	0.08^b±0.07
Dieldrin	2.38^c,b±0.01	2.39^c,b±0.01	7.62^a±5.72	𝟎.𝟎𝟏^d±0.01	0.13^d±0.05	3.13^b±1.53	0.18^d±0.03	NS	NS	0.65^c,d±0.53	0.05^d±0.03
Endrin	11.4^b±0.05	ND	0.22^c±0.16	21.28^a±3.17	0.11^c±0.03	0.39^c±0.12	0.54^c±0.15	NS	NS	ND	0.02^c±0.01

^∗Data in the same column followed by the same alphabets are not significantly different at 𝛼=0.05 using the new Duncan Multiple Range Test, NS: no sample, ND: not detected.