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PMNHA是一种新合成的氧肟酸类显色剂,用于分光光度法测定钒(V),具有更好的选择性。钒(V)与PMNHA在2—4M HCl溶液中能形成溶于三氟甲烷或其它有机溶剂的紫色络合物。此络合物用三氯甲烷苹取后,测得其最大吸收波长λ_(max)=530nm。 本文介绍用连续变化浓度法测定钒(V)与显色剂PMNHA所形成的络合物的组成,经测定钒(V)与PMNHA的络合此为1:2。
PMNHA is a newly synthesized hydroxamic acid chromogenic reagent for spectrophotometric determination of vanadium (V) with better selectivity. Vanadium (V) and PMNHA can form a purple complex dissolved in trifluoromethane or other organic solvents in 2-4M HCl solution. After the complex was extracted with chloroform, its maximum absorption wavelength λ max (max) was found to be 530 nm. In this paper, the composition of the complexes formed by vanadium (V) and chromogen PMNHA was determined by the continuously changing concentration method. The complexing ratio of vanadium (V) to PMNHA was 1: 2.