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钒的价态测定是近几年来提出的一项重要研究课题,不同价态钒的测定方法已有评述。为了能在溶液状态下测定样品中钒的价态,通常采用惰性气氛、低温、选择适宜的熔剂、分解试剂及络合剂等措施,以确保原有价态的稳定。 K_2Cr_2O_7电位滴定V(Ⅲ)、V(Ⅳ)或V(Ⅴ)时,V(Ⅲ)不稳定。本文选用了8—12MH_3PO_4作为分解试剂和络合剂,非氧化性混合酸HF-H_3PO_4对石煤
Determination of vanadium valence is an important research topic proposed in recent years, different valence vanadium determination has been reviewed. In order to determine the valence state of vanadium in the sample solution, usually inert gas, low temperature, select the appropriate flux, decomposition reagents and complexing agents and other measures to ensure the stability of the original valence. V (Ⅲ) is unstable when K_2Cr_2O_7 potentiometric titration V (Ⅲ), V (Ⅳ) or V (Ⅴ). This article selected 8-12MH_3PO_4 as a decomposition reagent and complexing agent, non-oxidizing mixed acid HF-H_3PO_4 on the coal