Interaction of Dioxovanadium(V) Ion with Methionine at Different Ionic Strengths

Abstract

The dependence on ionic strength of protonation of methionine and its complexation with dioxovanadium(V) is<br />reported in sodium perchlorate solution as supporting electrolyte. The measurements have been performed at 25<br />􀁻C using a combination of potentiometric and spectrophotometric techniques. The overall analysis of the present<br />and the previous data dealing with determination of stability constants at different ionic strengths allowed us to<br />obtain a general equation, by which a formation constant determined at a fixed ionic strength can be<br />recalculated, with a good approximation for another ionic strength in the range of 0.1 – 0.7 mol dm-3.