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

Table 4

Determination of PQ in plasma and urine sample with different hemoperfusion numbers by the proposed method and HPLC ().

Number of HP	Plasma/(×10^3 μg/L)		Urine/(×10^3 μg/L)
	The proposed method	HPLC	The proposed method	HPLC
0	6.84 ± 0.04	6.89 ± 0.04	8.54 ± 0.08	8.63 ± 0.07
1	3.32 ± 0.09	3.44 ± 0.10	1.26 ± 0.12	1.42 ± 0.13
2	1.05 ± 0.12	1.19 ± 0.11	0.24 ± 0.05	0.20 ± 0.05
3	0.34 ± 0.09	0.45 ± 0.09	ND	ND