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钒(Ⅴ)在2～9M盐酸溶液中与钽试剂(N-BPHA)生成紫色络合物被三氯甲烷萃取;钛在10M以上盐酸溶液中亦与钽试剂生成黄色络合物为三氯甲烷萃取。本文在保留原法的基础上,采用一次称样,用自己设计的萃取比色皿,在6M盐酸介质中把钒(Ⅴ)-N-BPHA萃取至三氯甲烷中于530nm测定钒的吸光度之后,立即向该有机相及水相的溶液中加入二氯化锡浓盐酸溶液,存9M盐酸介质中通过萃取将钒(Ⅴ)、铁(Ⅲ)、铬(Ⅵ)等还原以消除干扰,于420nm测定钛的吸光变。本法简便,用于测定低合金钢、半钢和生铁中的钒和钛。
Vanadium (V) forms a purple complex with tantalum reagent (N-BPHA) in 2 to 9 M hydrochloric acid solution and is extracted with trichloromethane. Titanium also forms yellow complex with tantalum reagent in 10 M hydrochloric acid solution as chloroform extraction. In this paper, based on the original method, using a sample, with their own design designed to extract the cuvette, vanadium (Ⅴ) -N-BPHA in 6M hydrochloric acid medium was extracted into chloroform at 530nm after the determination of vanadium absorbance , Immediately added to the organic phase and the aqueous solution of tin dichloride concentrated hydrochloric acid solution, stored in 9M hydrochloric acid medium by extraction of vanadium (Ⅴ), iron (Ⅲ), chromium (Ⅵ) reduction to eliminate interference in The absorbance of titanium was measured at 420 nm. This method is simple and convenient for the determination of vanadium and titanium in low-alloy steels, semi-steels and pig iron.