Simultaneous Determination of Parathion, Malathion, Diazinon, and Pirimiphos Methyl in Dried Medicinal Plants Using Solid-Phase Microextraction Fibre Coated with Single-Walled Carbon Nanotubes

Table 3

Estimated recoveries, accuracies, and precisions for determination of the analytes at different concentrations (𝑛=6) in QC samples.

Target compound	sample	Nominal concentration (ng g^−1)	Mean of calculated concentration (ng g^−1)	CV(%) of calculated concentration (interday)	CV(%) of calculated concentration (intraday)	RE(%) of calculated concentration^a	Estimated recoveries (%)	CV(%) of calculated recovery	RSD between fibres (%)
									SWCNTS	PDMS
Diazinon	QC1	3	2.6	11.8	11.2	−13.3	78	12.1
	QC2	75	70.4	10.3	10.1	−6.1	82	10.2	10.8	6.7
	QC3	275	261	9.5	8.2	−5.1	87	8.8
Pirimiphos methyl	QC1	3	2.7	11.5	11.2	−10.0	77	11.7
	QC2	75	69.7	10.7	10.4	−7.1	84	10.5	11.6	7.8
	QC3	275	258	9.7	9.5	−6.2	85	8.7
Malathion	QC1	3	3.4	13.1	12.7	13.3	75	12.7
	QC2	75	78.4	12.2	11.8	4.5	79	11.8	11.2	6.5
	QC3	275	285.7	10.7	9.8	3.9	82	10.6
Parathion	QC1	3	2.7	12.6	12.2	−10.0	81	12.4
	QC2	75	70.3	11.6	11.3	−6.3	84	11.3	12.4	6.3
	QC3	275	266.7	10.4	9.8	−3.0	83	9.8

Note: 𝑎Relative error = [(calculated concentration/nominal concentration)−1]×100.