Research Article
Separation and Determination of Fe(III) and Fe(II) in Natural and Waste Waters Using Silica Gel Sequentially Modified with Polyhexamethylene Guanidine and Tiron
Figure 2
Recovery of Tiron (1) and catechol (2) by the SiO2-PHMG sorbent versus рН ( mM (1, 2); 0.100 g of the sorbent; mL, contact time 10 min).