钼—3,5-二溴-4-氨基苯基荧光酮—表面活性剂分光光度法研究及其应用

Spectrophotometric Study on the Color Reaction of Mo(Ⅵ)—(3,5-Dibromo-4-amino) phenylfluorone—Surfactants System and Its Application

研究了在表面活性剂ＣＴＭＡＢ存在下，盐酸介质中，新显色剂３，５－二溴－４－氨基苯基荧光酮（ＤＢＡＰＦ）与钼（Ⅵ）的分光光度性质及反应条件，其最大吸收波长λｍａｘ＝５３０ｎｍ，表观摩尔吸光系数ε＝１３０×１０５，检测钼（Ⅵ）范围为０～０３６μｇ／ｍｌ，符合比尔定律，相关系数ｒ＝０９９９５。试验了十多种离子的干扰情况，用连续变化法和饱和法测定了该络合物的络合比，在ＣＴＭＡＢ存在下，Ｍｏ（Ⅵ）：ＤＢＡＰＦ＝１∶２。由此，建立了分光光度法测定微量钼的高灵敏度，较高选择性的新方法。并成功应用于低合金钢样品中钼的测定，结果满意。

A highly sensitive color reaction of molybdenum(Ⅵ)-3,5-dibromo-4-amino) phenylfluorone (DBAPF)-CTMAB surfactants has been investigated spectrophotometrically. The color reaction of Mo(Ⅵ) with DBAPF in the medium of 0 16 - 0 5 mol/L hydrochloric acid has been studied. The molar absorptivity of the complex is 1 30×10 5 L\5mol -1 cm -1 at 530nm in 0 32mol/L HCl solution Beer’s law is obeyed in the range of 0-0.36μg/ml for Mo.Most other metal ions do not interfere.This method has been used directly for the determination of Mo(Ⅵ) in steel with satisfactory results.