4,5-二溴邻硝基苯基荧光酮非离子表面活性剂分光光度法测定微量钼

Spectrophotometric Determination of Molybden (Ⅵ) with 4,5 Di bromo 2 nitro phenylfluorone

研究了钼４，５二溴邻硝基荧光酮（ Ｂｒ Ｏ Ｎ Ｐ Ｅ）吐温４０ 显色体系的吸收光谱特性，在吐温４０ 存在下，钼（Ⅵ）与 Ｂｒ Ｏ Ｎ Ｐ Ｆ形成红色络合物．在 １．１～１．３ ｍ ｏｌ／ Ｌ 的盐酸介质中，络合物的吸收波长为 ５４０ ｍ ｍ ，摩尔吸光系数为 ９．５×１０４ Ｌ·ｍ ｏｌ·ｃｍ － １ ．钼（Ⅵ）的含量在 ０～１４ μｇ／２５ ｍ ｌ的范围内，符合比耳定律．多数常见阳离子不干扰显色反应．本法用于合金钢标样中的微量钼，获得了满意的结果．

The complex of Molybden (Ⅵ) and Br ONPF is formed in the presence of toween 40.The complex is investigated spectrophotometrically is 9.5×10 4 L·mol -1 ·cm -1 at the wavelength of 540 nm under the experiment condition.Beer′s law is obeyed for Molybden (Ⅵ) of 0 to 14 μg in measuring volumetric of 25 ml.It is estimated that the molar ratio of the complex is 1∶2 to Molybden and Br ONPF.The determination of alloy steels shows the satisfactory result.