Table 3.

Inter–day and intra-day precision data obtained from analysis of a multi-standards of 18 OCPs in extracts of fortified laboratory blank-liver, -gills, and -muscles tissue of fish samples (0.1 µg/Kg bw) and extracted using QuEChERS technique and analyzed using GC-ECD

OCPs	Inter-day precision (R% ± RSD)			Intra-day precision (R% ± RSD)
	Liver	Gills	Muscles	Liver	Gills	Muscles
α-HCH	97.1 ± 4.1	94.1 ± 4.1	96.1 ± 4.1	98.1 ± 4.1	95.1 ± 5.1	99.1 ± 5.1
γ-HCH	92.2 ± 5.1	93.2 ± 5.1	92.2 ± 5.1	90.2 ± 6.2	94.2 ± 7.2	90.2 ± 7.2
β-HCH	95.2 ± 6.1	94.2 ± 6.1	92.2 ± 6.1	96.1 ± 5.2	95.1 ± 7.2	98.1 ± 7.2
Heptachlor	94.2 ± 5.1	98.2 ± 5.1	97.2 ± 5.1	92.2 ± 7.1	93.2 ± 7.1	94.2 ± 7.1
δ-HCH	95.6 ± 3.0	95.8 ± 3.0	95.8 ± 3.0	97.2 ± 6.1	98.2 ± 5.1	96.2 ± 5.1
Aldrin	95.9 ± 3.9	98.9 ± 3.9	97.9 ± 3.9	95.9 ± 5.1	95.9 ± 5.1	92.9 ± 41
Heptachlorepoxide	93.9 ± 4.1	95.9 ± 4.1	93.9 ± 4.1	92.6 ± 5.3	95.9 ± 6.3	93.9 ± 6.3
Endosulfan Ι	96.1 ± 5.1	96.1 ± 5.1	98.1 ± 5.1	97.1 ± 4.5	97.1 ± 4.5	97.1 ± 4.5
p,p-DDE	94.2 ± 3.2	94.2 ± 3.2	94.2 ± 3.2	95.2 ± 6.2	95.2 ± 6.2	95.2 ± 6.2
Dieldrin	97.1 ± 4.2	96.1 ± 2.2	95.1 ± 2.2	95.8 ± 5.1	96.8 ± 5.1	96.8 ± 5.1
Endrin	97.1 ± 6.5	95.1 ± 6.5	96.1 ± 6.5	98.2 ± 7.3	96.2 ± 7.3	99.2 ± 7.3
p,p-DDD	91.1 ± 4.1	91.1 ± 4.1	94.1 ± 4.1	91.3 ± 5.1	92.3 ± 61	92.3 ± 61
Endosulfan Π	98.1 ± 6.5	98.1 ± 6.5	95.1 ± 6.5	98.2 ± 6.7	99.2 ± 6.7	97.2 ± 6.7
p,p-DDT	92.1 ± 4.1	93.1 ± 4.1	94.1 ± 4.1	90.3 ± 7.1	92.3 ± 7.1	95.3 ± 7.1
Endrin aldehyde	94.2 ± 5.1	94.2 ± 5.1	96.2 ± 5.1	95.2 ± 6.1	95.2 ± 6.1	97.2 ± 6.1
Endosulfan sulfate	92.2 ± 4.1	93.2 ± 4.1	90.2 ± 4.1	90.8 ± 5.6	94.8 ± 5.6	90.8 ± 5.6
Methoxychlor	91.3 ± 5.1	95.3 ± 5.1	91.3 ± 5.1	92.2 ± 4.5	93.2 ± 3.5	90.2 ± 4.5
Endrin ketone	93.2 ± 3.4	91.2 ± 3.4	93.2 ± 3.4	93.3 ± 4.2	92.3 ± 4.2	92.3 ± 4.2