Magnetic Solid-Phase Extraction Using Fe₃O₄@SiO₂ Magnetic Nanoparticles Followed by UV-Vis Spectrometry for Determination of Paraquat in Plasma and Urine Samples

Table 3

Determination of PQ in different plasma and urine samples ().

Sample	PQ content in sample	Added (μg/L)	Found (μg/L)	Recovery/%
Plasma from healthy adults	ND; (3.0 mL plasma)	0	ND	—
		40.0		96.2
		80.0		97.6
Plasma from PQ patients	31.50 ng/mL; (3.0 mL plasma)	0		—
		5		102.4
		10		93.6
Urine from healthy adults	ND; (100.0 mL)	0	ND	—
		100.0		95.8
		200.0		92.9
Urine from PQ patients	78.92 ng/mL; (50.0 mL)	0		—
		20.0		103.5
		40.0		94.8

ND, nondetectable.