Research Article

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

Figure 13

(a) The UV spectrogram of PQ-NaOH-Na2S2O4 and eluent-Na2S2O4; the insert image is blue free radicals of paraquat. (b) The UV spectrogram of DQ-NaOH-Na2S2O4 and eluent-Na2S2O4; the insert image is green free radicals of diquat. (c) The zeta potential of CoFe2O4@SiO2 NPs.
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