摘要
研究了5-(5-硝基-2-吡啶偶氮)-2,4-二氨基甲苯(5-NO2-PADAT)与铂(Ⅳ)的显色反应.结果表明,在pH 4.0～6.4的乙酸-乙酸钠缓冲溶液中,铂(Ⅳ)可与该试剂形成稳定的1:1红色络合物,在乙醇存在下,于1.8 mol/L的盐酸介质中可转变为蓝绿色络合物.其最大吸收波长为607 nm,表观摩尔吸光系数可达8.29×104;在10 mL溶液中,铂(Ⅳ)在0～10μg范围内符合比尔定律;较大量的常见金属离子不干扰测定.本方法灵敏度高、选择性好,用于铂催化剂中微量铂测定,结果满意.
The color reaction of a reagent 5- （5-nitro-2-pyridylazo）-2,4-diamino-toluene with platinum（Ⅳ） was studied. In a buffer solution of HAc - NaAc （pH 4.0 - 6.4） ,platinum reacts with 5-NO2-PADAT to form a red complex. The ratio of platinum to 5-NO2-PADAT is 1 ： 1 in the complex. The complex changes into a blue-green complex in 1.8 mol/L hydrochloric acid and ethanol solution. The apparent molar absorptivity is 8.29 × 10^4 L·mol^-1·cm^-1 at 607 nm. Beer＇ s law is obeyed in the range of 0 - 10μg/10 mL for platinum （Ⅳ）. The method has more sensitivity and selectivity. Relatively large amounts of co-existing ions can be tolerated. It has been applied to the determination of trace platinum（Ⅳ） in catalysts with satisfactory results.
出处
《冶金分析》
CAS
CSCD
北大核心
2005年第4期58-60,共3页
Metallurgical Analysis
基金
河南省自然科学基金资助课题(0311021700)
