摘要
研究了对碘偶氮氯膦（ＣＰＡ－ｐＩ）与Ｂｉ（Ⅲ）的显色反应，并用以测定合金中的微量铋。试验表明：在０．１０ｍｏｌ／ＬＨＣｌＯ４介质中，Ｂｉ（Ⅲ）与ＣＰＡ－ｐＩ形成１：３的蓝绿色络合物。显色剂的吸收峰位于５５０ｎｍ，络合物的吸收峰在６８０ｎｍ处，其表观摩尔吸光系数ε６８０＝６．４８×１０４Ｌ·ｍｏｌ－１·ｃｍ－１。Ｂｉ（Ⅲ）浓度在０～９５７×１０－６ｍｏｌ／Ｌ（即０～２．０μｇ／ｍｌ）范围符合比尔定律。测定了近３０种共存离子的影响，大多数常见离子对测定干扰较少。方法用于测定铸造铝合金与焊锡中的微量铋，结果满意。
The colour reaction of BiⅢ)with p-iodochlorophosphonazo (CPA-pl)has been studied.It is shown that the blue-green coordination complex is formed in 0.04-0.15mol/L HClO4 medium,Its λmax is 680nm.The molar absorptivity ε680 is 6.48×104L·mol-1·cm-1.Beer's law is obeyed in the range of 0-9.57×10-6 mol/L(0-2.0μg/ml)for Bi(Ⅲ),The interferences are studied.This method has been applied to determining Bi in the Al-alloy and soldering tin.The results are satisfactory.
出处
《冶金分析》
CAS
CSCD
北大核心
1996年第6期20-22,共3页
Metallurgical Analysis
