摘要
在醋酸溶液煮沸的情况下，钼能与羟胺和３．５－二Ｂｒ－ＰＡＤＡＰ反应生成蓝色的三元配合 物，其最大吸收波长在６２０ｎｍ，摩尔吸光系数为４．８×１０～４，其组成为：Ｍｏ（Ⅵ）：ＮＨ２ＯＨ：３．５－二 Ｂｒ－ＰＡＤＡＰ＝１：１：１．１０ｍｌ显色液含钼量在０－３０μｇ范围内遵守比耳定律．共存离子的干扰采用显 色后加入混合掩蔽剂并煮沸的方法来消除．选择性好，是在大量钨存在下直接测定钼的最灵敏方 法之一．该法用于测定多种样品中微量的钼，结果满意．
When the solution containing Mo(Ⅵ) is boiled in the presence of NH2OH, Mo(Ⅵ) can react with 3.5-2Br-PADAP, forming a blue ternaty complex Mo(Ⅵ)-NH2OH -3.5-2Br-PADAP, the wavelongth of maximum absorbance for the complex being at 620nm, and the apparent molar absorptivity being 48000 at 620nm. Beer's law is obeyed in the range of 0-30μg/ 10ml for Mo(Ⅵ). As contrary to the usual practice masking agent is added after the colour development, and then the solution is boiled again to eliminate the ef- fect of interfering ions. It has been found that the method proposed in this work has very high selectivity. The method has been applied to the direct determination or Mo(Ⅵ) in alloy steels, mineral and soium wolframate with satisfactory results.
出处
《福州大学学报（自然科学版）》
CAS
CSCD
1990年第2期103-108,共6页
Journal of Fuzhou University(Natural Science Edition)
基金
福建省自然科学基金资助
关键词
钼
测定
三元配合物
分光光度法
molybdenum
3.5-diBr-PADAP
ternary complex
spectrophotometric deter- mination
