摘要
研究了用新试剂５－（５－硝基－２－吡啶偶氮）－２，４－二氨基甲苯（５－ＮＯ２－ＰＡＤＡＴ）分光光度法测定微量铱（Ⅲ）的适宜条件。结果表明，在ｐＨ５．０－６．４的ＮａＡｃ－ＨＡｃ缓冲溶液中，５－Ｎ０２－ＰＡＤＡＴ与Ｉｒ（Ⅲ）反应生成稳定的络合物。在０．１２ｍｏｌ／ＬＨ２ＳＯ４溶液中其最大吸收波长，表现摩尔吸光系数铱浓度在０－０．７ｕｇ／ｍｌ范围内遵守比尔定律。以ＤＣＴＡ为掩蔽剂。大量的常见金属离子对测定无干扰，方法灵敏度高，选择性好，用于催化剂中微量铱的测定，结果满意。
A sensitive and selective method for the spectrophotometric determination of micro amount iridium is reported. The results show that Ir(Ⅲ) reacts with 5-(5-nitro-2-pyridylazo)-2,4-diamino-toluene to form stable red* complex(1:2)in the HAc-NaAc medium at pH5.0-6.4. The complex can clanged into another species in 0.12mol/L* H2SO4 mediuom. The apparent molar absorptivity is 5.1 x104L·mol-1 · cm-1 at 564nm. Beer's law is obeyed in* the range of 0-0.7ug/ml for Ir. In the presence of DCTA,most common ions do not interfere. The method has applied to the determination of trace iridium in a catalyst with satisfactory results.
出处
《冶金分析》
CAS
CSCD
北大核心
1998年第3期14-16,共3页
Metallurgical Analysis
关键词
铱
分光光度法
显色剂
Nitro-2-pyridylazo)-2
4-diamino-toluene
Spectrophotometry
Iridium
