钒-9-(3,5-二溴)水杨基荧光酮-溴化十六烷基三甲基铵显色反应的研究及其应用

Study on the Colour Reaction of Vanadium with 3,5 Dibromo Salicylfluorone and Cetyltrimethylammonium Bromide and Its Application

研究了钒－９－（３，５－二溴）水杨基荧光酮－ＣＴＭＡＢ三元配合物的显色反应条件，在ｐＨ５．５的六次甲基四胺－ＨＣｌ缓冲溶液中，钒与试剂形成１∶２的配合物，其最大吸收波长λｍａｘ＝５５７ｎｍ，表观摩尔吸光系数为ε＝１．８１×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，钒含量在０～９μｇ／２５ｍｌ范围内符合比耳定律．采用适当的分离手段，测定了钢样中的微量钒，结果满意．

The condition of colour reaction of vanadium with DBSF in the presence of CTMAB were studied.In the pH=5.5 buffer solution of hexamethylene tetramine hydrochloric acid,vanadium reacts with DBSF and CTMAB to form a 1∶2 complex with maximum absorption at 557 nm.The molar absorptivity is 1.81×10 5 L·mol -1 ·cm -1 .Beer′s law is obeyed in the concentration range of 0￣9 μg/25 ml for V(V).The method has been applied to determine micioamounts of vanadium in steels by proper isolated method.