Magnetic Solid-Phase Extraction Using Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> Magnetic Nanoparticles Followed by UV-Vis Spectrometry for Determination of Paraquat in Plasma and Urine Samples

<div>Factors affecting the extraction efficiency. The extraction efficiency (<svg height="13.3337pt" id="M6" style="vertical-align:-4.697801pt" version="1.1" viewbox="-0.0498162 -8.6359 20.7098 13.3337" width="20.7098pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M593 650H142L136 622C219 616 224 611 209 531L130 120C114 39 108 34 23 28L17 0H501C518 32 557 130 568 158L540 169C519 132 495 93 469 70C439 43 409 35 332 35C272 35 241 37 225 50C211 61 211 89 222 149L253 320H350C441 320 443 312 441 239H471L510 434H481C455 366 448 358 360 358H260L303 572C311 613 312 615 348 615H431C509 615 522 603 532 581C544 555 546 531 545 491L574 493C583 555 592 631 593 650Z" id="g113-70"></path><glyph.data ascent="3473" descent="-2876" horiz-adv-x="616" vert-adv-y="616" xpluscharwidth="8.008"></glyph.data></g><g transform="matrix(.0091,0,0,-0.0091,7.943,3.132)"><path d="M46 650V618C122 613 130 611 130 522V128C130 46 123 40 40 32V0H319V32C227 40 217 42 217 128V279L292 260C303 259 322 258 338 261C436 272 534 337 534 467C534 534 508 580 469 609C428 640 371 650 299 650H46ZM217 558C217 585 220 596 228 603C235 610 256 615 284 615C367 615 435 571 435 463C435 339 358 304 291 304C256 304 229 310 217 317V558Z" id="g58-78"></path><glyph.data ascent="1007" descent="-369" horiz-adv-x="573" vert-adv-y="573" xpluscharwidth="13.15728281"></glyph.data></g><g transform="matrix(.0091,0,0,-0.0091,13.157,3.132)"><path d="M729 -138C637 -95 547 -41 484 2C600 37 712 151 712 329C712 532 560 665 390 665C173 665 46 499 46 313C46 210 91 125 155 69C217 10 303 -11 357 -14C482 -102 560 -138 592 -146C623 -155 672 -162 720 -162L729 -138ZM351 29C239 53 151 172 151 340C151 531 256 624 365 624C501 624 607 507 607 303C607 142 529 55 447 31L418 51L351 29Z" id="g58-79"></path><glyph.data ascent="1007" descent="-369" horiz-adv-x="756" vert-adv-y="756" xpluscharwidth="20.03657732"></glyph.data></g></svg>%) was determined as a function of pH (a), the amount of Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> (b), the extraction time (c), and the sample volume (d).</div>

Journal of Analytical Methods in Chemistry

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Figure 3

Figure 3: Magnetic Solid-Phase Extraction Using Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> Magnetic Nanoparticles Followed by UV-Vis Spectrometry for Determination of Paraquat in Plasma and Urine Samples 

Figure 3 | Magnetic Solid-Phase Extraction Using Fe3O4@SiO2 Magnetic Nanoparticles Followed by UV-Vis Spectrometry for Determination of Paraquat in Plasma and Urine Samples 