The likely interactions between CM-α-CD-Fe₃O₄ and the acids p-APAA and p-NPAA.

<p>The likely interactions between CM-α-CD-Fe₃O₄ and the acids p-APAA and p-NPAA.</p

Effect of adsorption solvent on the adsorption efficiency of five phenylarsonic acids.

<p>The concentration of each phenylarsonic acids was 50 ng/mL. Adsorption time was 30 min. 5 mg adsorbent was used. (n = 3, with RSD<4.5%).</p

Concentration (µg/L) of coexisting analogues when tolerance factor less than 5%.

<p>Concentration (µg/L) of coexisting analogues when tolerance factor less than 5%.</p

Adsorption saturation curve of CM-α-CD-Fe₃O₄ nanoparticles to five phenylarsonic acids.

<p>5 mg adsorbent was used for each solution. Adsorption time was 30 min. Desorption was in water for 10 min. (n = 3, with RSD<5.7%).</p

MRM chromatogram of five arsenical compounds standards at 2.0 µg/L.

<p>MRM chromatogram of five arsenical compounds standards at 2.0 µg/L.</p

Recovery of different concentrations of phenylarsonic acids (ROX). (n = 3, with RSD<5.0%).

<p>Recovery of different concentrations of phenylarsonic acids (ROX). (n = 3, with RSD<5.0%).</p

Analytical parameters of MS/MS.

<p>Analytical parameters of MS/MS.</p

Effect of CM-α-CD amount used in modification on the adsorption efficiency of phenylarsonic acids (ROX). (n = 3, with RSD<6.5%).

<p>Effect of CM-α-CD amount used in modification on the adsorption efficiency of phenylarsonic acids (ROX). (n = 3, with RSD<6.5%).</p

TEM images of magnetic Fe₃O₄ nanoparticles (a) and CM-α-CD-Fe₃O₄ nanoparticles (b).

<p>TEM images of magnetic Fe₃O₄ nanoparticles (a) and CM-α-CD-Fe₃O₄ nanoparticles (b).</p

Comparison of Fe3O4 nanoparticles (blue diamond) and CM-a-CD-Fe3O4 nanoparticles for adsorption of ROX (red square).

<p>Comparison of Fe3O4 nanoparticles (blue diamond) and CM-a-CD-Fe3O4 nanoparticles for adsorption of ROX (red square).</p