Research Article
Magnetic Solid-Phase Extraction Using Fe3O4@SiO2 Magnetic Nanoparticles Followed by UV-Vis Spectrometry for Determination of Paraquat in Plasma and Urine Samples
Figure 3
Factors affecting the extraction efficiency. The extraction efficiency (%) was determined as a function of pH (a), the amount of Fe3O4@SiO2 (b), the extraction time (c), and the sample volume (d).
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(b) |
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(d) |