Table 2.

Average recovery percentages ± relative standard deviation (RSD) for 18 OCPs extracted from fortified laboratory blank-liver, -gills, and –muscles tissue samples of fish using QuEChERS technique with two levels of the multi-standards mixture (0.1 and 1 µg/Kg)

OCPs	0.1 µg/Kg			1 µg/Kg
	Liver	Gills	Muscles	Liver	Gills	Muscles
α-HCH	93.1 ± 1.3	95.1 ± 3.2	91.2 ± 6.1	94.1 ± 1.3	94.1 ± 3.2	90.2 ± 6.1
γ-HCH	95.1 ± 1.3	96.1 ± 4.2	94.2 ± 5.1	93.1 ± 1.3	94.1 ± 4.2	93.2 ± 5.1
β-HCH	96.2 ± 2.3	97.3 ± 3.2	96.1 ± 6.1	97.2 ± 2.3	99.3 ± 3.2	95.1 ± 6.1
Heptachlor	97.3 ± 4.1	98.1 ± 2.2	97.1 ± 6.1	98.3 ± 4.1	96.1 ± 2.2	98.1 ± 6.1
δ-HCH	98.3 ± 5.1	99.1 ± 3.1	99.1 ± 5.1	96.3 ± 5.1	97.1 ± 3.1	97.1 ± 5.1
Aldrin	93.3 ± 2.2	98.2 ± 2.2	100.1 ± 3.2	92.3 ± 2.2	95.2 ± 2.2	98.1 ± 3.2
Heptachlorepoxide	99.1 ± 3.2	99.2 ± 3.2	99.1 ± 5.2	97.1 ± 2.2	98.2 ± 3.2	99.1 ± 5.2
Endosulfan Ι	98.1 ± 2.5	100.1 ± 1.2	100.1 ± 3.2	98.1 ± 2.5	98.1 ± 1.2	97.1 ± 3.2
p,p-DDE	100.1 ± 3.5	92.2 ± 3.2	99.1 ± 6.1	98.1 ± 3.5	95.2 ± 3.2	98.1 ± 6.1
Dieldrin	98.2 ± 2.5	99.1 ± 3.2	94.2 ± 3.2	96.2 ± 3.5	98.1 ± 3.2	93.2 ± 3.2
Endrin	93.2 ± 5.1	100.2 ± 3.4	99.2 ± 4.1	93.2 ± 5.1	98.2 ± 3.4	98.2 ± 4.1
p,p-DDD	94.5 ± 3.2	93.2 ± 2.3	95.3 ± 5.2	95.5 ± 3.2	95.2 ± 2.3	93.3 ± 5.2
Endosulfan Π	95.6 ± 2.2	94.2 ± 2.4	91.1 ± 3.2	96.6 ± 2.2	96.2 ± 2.4	96.1 ± 3.2
p,p-DDT	96.7 ± 3.2	98.2 ± 3.1	99.1 ± 3.3	97.7 ± 3.2	95.2 ± 3.1	98.1 ± 3.3
Endrin aldehyde	99.1 ± 3.1	99.1 ± 4.1	100.3 ± 2.3	98.1 ± 3.1	96.1 ± 4.1	97.3 ± 2.3
Endosulfan sulphate	98.1 ± 2.5	98.2 ± 3.2	92.1 ± 4.1	96.1 ± 1.5	95.2 ± 3.2	96.1 ± 4.1
Methoxychlor	99.9 ± 2.3	100.1 ± 2.2	91.2 ± 3.2	97.9 ± 1.3	98.1 ± 2.2	95.2 ± 3.2
Endrin ketone	98.9 ± 2.5	95.6 ± 3.2	93.2 ± 3.2	96.9 ± 2.5	94.6 ± 3.2	97.2 ± 3.2

n = 3 Replicates