镱(Ⅲ)与2-(5-溴2-吡啶偶氮)-5-二乙氨基酚显色反应的分光光度法研究

Spectrophotometic Studies on the Colour Reaction of Ytterbium with 2-(5-Bromo-2-Pyridylazo)-5-Diettylaminophend

研究了在表面活性剂CTMAB存在下镱（Ⅲ）与5－Br－PADAP的显色反应．结果表明，在pH=9．66的NH4Cl－NH3·H2O缓冲溶液中，镱（Ⅲ）与5－Br－PADAP进行最佳络合．最大吸收波长λmax=580nm．表观摩尔系数为1．5×105L·mol-1·cm－1，镱（Ⅲ）星在0－12μg／25ml范围内符号比尔定律．

The conditions of colour reaction of Yb (Ⅲ) with 5-Br-PADAP in thepresence of CTMAB is reported in this paper. It is found that Yb(Ⅲ) reacts with 5-Br-PADAP and CTMAB in a pH9. 6 buffer solution to form a complex with maximum ab-sorption at 580nm, the molar absorptivity is 1. 5 × 105L. mol-1·cm-1. Beer's law isobeyed in the range of O-12μg/25ml.