摘要
本文研究了在适量镉和混合表面活性剂存在下,meso-四(4-乙酰氧基苯)卟啉[T(4-AOP)P]与Au(Ⅲ)的显色反应。结果表明,在pH10.0～11.2介质中,Au(Ⅲ)与T(4-AOP)P形成了灵敏度很高的稳定络合物,其摩尔吸光系数ε_(420nm)=1.62×10~6L·mol^(-1)。cm^(-1),金(Ⅲ)浓度在0～1.2μg/10ml范围内服从比耳定律。络合物中的摩尔比为Au(Ⅲ):T(4-AOP)P=1:1。用泡沫塑料预分离富集金;将拟定的新方法应用于岩矿中金的测定,得到较为满意的结果。
A highly sensitive color reaction of gold( Ⅲ )with meso-tetrakis(4-aeetyloxylphenyl)porphyrin[T-(4-AOP)P]has been studied in the presence of Cd( Ⅲ ), sodium dodecyl sulfate and Triton X-100. It shows that gold( Ⅲ ) complex forms at pH 10.,0-11. 2 by heating at 100℃ for 6 min, and the molar absorptivity of the complex is 1. 62×106 L · mol-l · cm'1 at 420 nm. The complex is stable for at least 80 min. The molar ratio of Au( Ⅲ ) to T(4-AOP)P is found to be 1 : 1. Beer's law is obeyed in the range of 0-1. 2 μg/10 ml for gold( Ⅲ ). Tolerance limit has been shown for 30 cationic ions by using masking-agents, combining with the separation and preconcentration of gold by polyurethane foamed plastics, the method has been applied to the determination of gold in some geological samples with satisfactory results.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1993年第4期375-378,共4页
Chinese Journal of Analytical Chemistry
