Determination of Organochlorine Pesticides in Green Leafy Vegetable Samples via Fe₃O₄ Magnetic Nanoparticles Modified QuEChERS Integrated to Dispersive Liquid-Liquid Microextraction Coupled with Gas Chromatography-Mass Spectrometry

Table 1

Retention time and quantitative and qualitative ions of 8 OCPs.

Peak number	Compound	Retention time (min)	Mass-to-charge ratio (m/z)
			Quantitative ion	Qualitative ion
1	α-HCH	10.265	181	181, 183, 219
2	β-HCH	10.665	109	109, 181, 183
3	γ-HCH	10.830	181	181, 183, 219
4	δ-HCH	11.310	181	181, 183, 219
5	p,p′-DDE	15.585	246	246, 248, 318
6	p,p′-DDD	17.080	235	235, 237, 165
7	o,p′-DDT	17.190	235	235, 237, 165
8	p,p′-DDT	18.750	235	235, 237, 165