Separation and Determination of Fe(III) and Fe(II) in Natural and Waste Waters Using Silica Gel Sequentially Modified with Polyhexamethylene Guanidine and Tiron

<div>Sorption isotherms of SiO<sub>2</sub>-PHMG sorbent for Tiron at рН 3.0 (1), рН 6.0 (2), after sequential sorption of Tiron at рН 6.0, and then at рН 3.0 (3).</div>

Journal of Analytical Methods in Chemistry

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Figure 3: 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 3 | Separation and Determination of Fe(III) and Fe(II) in Natural and Waste Waters Using Silica Gel Sequentially Modified with Polyhexamethylene Guanidine and Tiron 