Correction: AlSuhaimi, A.O. Amberlite XAD-4 Functionalized with 4-(2-Pyridylazo) Resorcinol via Aryldiazonium Chemistry for Efficient Solid-Phase Extraction of Trace Metals from Groundwater Samples. Appl. Sci. 2025, 15, 9044

In the original publication [1], there were some mistakes in Figure 5 and Figure 6 as published. The material name in the caption of Figure 5 was incorrect. The correct caption appears below.

Figure 5. Effect of solution pH on the equilibrium sorption capacity q_e (mMg⁻¹) of Co(II), Ni(II), and Cu(II) onto XAD-4–PAR chelator.

In Figure 6, the caption and image were mistakenly replaced with a duplicate of Figure 5. The corrected Figure 6 appears below.

Figure 6. Contact time effect on Co(II), Ni(II), and Cu(II) extraction by XAD-4–PAR from a 50.0 mL multielement standard (each; 10 mg L⁻¹), plotted as percent extraction versus time.

Figure 6. Contact time effect on Co(II), Ni(II), and Cu(II) extraction by XAD-4–PAR from a 50.0 mL multielement standard (each; 10 mg L⁻¹), plotted as percent extraction versus time.

The authors state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.