2019
DOI: 10.17675/2305-6894-2019-8-2-18
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A study of the H2SO4–H3PO4–H2O–Fe(III) system by cyclic voltammetry

Abstract: The electrochemical behavior of Fe(III) cations on a platinum electrode in the H 2 SO 4-H 3 PO 4-H 2 O, H 2 SO 4-H 2 O, and H 3 PO 4-H 2 O systems (25-95°C) has been studied by cyclic voltammetry. The oxidizing ability of the 2.0 M H 2 SO 4 + H 3 PO 4 system containing 0.10 М Fe(III) decreases as the molar fraction of H 3 PO 4 increases. The observed effect results from the formation of Fe(III) complexes with phosphate anions that are weaker oxidants than the corresponding hydrate and sulfate complexes. An inc… Show more

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Cited by 4 publications
(1 citation statement)
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“…In solutions of acid mixtures (HCl + H 3 PO 4 or H 2 SO 4 + H 3 PO 4 ) containing Fe(III) salts, the oxidation capability decreases with an increase in the relative content of H 3 PO 4 in the system [165,166]. In addition, examination of the system H 2 SO 4 -H 3 PO 4 -H 2 O-Fe(III) by cyclic voltammetry (CVA) shows that binding Fe(III) ions into phosphate complexes significantly decreases the rate of their diffusion in a corrosion environment [167]. This plays an important role in inhibiting Fe(III) reduction on the surface of corroding steel because this process is diffusion-controlled [126].…”
Section: Ligandsmentioning
confidence: 99%
“…In solutions of acid mixtures (HCl + H 3 PO 4 or H 2 SO 4 + H 3 PO 4 ) containing Fe(III) salts, the oxidation capability decreases with an increase in the relative content of H 3 PO 4 in the system [165,166]. In addition, examination of the system H 2 SO 4 -H 3 PO 4 -H 2 O-Fe(III) by cyclic voltammetry (CVA) shows that binding Fe(III) ions into phosphate complexes significantly decreases the rate of their diffusion in a corrosion environment [167]. This plays an important role in inhibiting Fe(III) reduction on the surface of corroding steel because this process is diffusion-controlled [126].…”
Section: Ligandsmentioning
confidence: 99%