Separation and Determination of Paraquat and Diquat in Human Plasma and Urine by Magnetic Dispersive Solid Phase Extraction Coupled with High-Performance Liquid Chromatography

Table 2

The intraday and interday accuracy and precision of paraquat and diquat in human plasma and urine.

Sample	Analyte	Concentration (ng/mL)	Intraday			Interday
			Mean (ng/mL)	Accuracy (%)	RSD (%)	Mean (ng/mL)	Accuracy (%)	RSD (%)
Plasma	Paraquat	100.0	90.6	90.6	5.7	84.9	84.9	4.7
		200.0	184.2	92.1	5.2	177.4	88.7	2.9
		500.0	482.0	96.4	3.4	463.5	92.7	2.6
	Diquat	100.0	88.9	88.9	5.4	84.5	84.5	4.6
		200.0	184.8	92.4	3.5	173.8	86.9	6.7
		500.0	485.5	96.7	3.8	465.5	92.7	5.2
Urine	Paraquat	100.0	89.5	89.5	4.7	85.4	85.4	6.3
		200.0	177.4	88.7	5.4	180.8	90.4	5.5
		500.0	467.2	93.4	2.7	450.5	90.1	3.9
	Diquat	100.0	88.6	88.6	5.8	84.6	84.6	5.1
		200.0	184.8	92.4	4.3	174.6	87.3	4.7
		500.0	477.5	95.5	4.6	456.5	91.2	3.8