新显色剂5-(5-硝基-2-羟基苯偶氮)罗丹宁与Au(Ⅲ)的超高灵敏显色反应的研究  

STUDY ON THE HIGH-SENSITIVE COLOUR REACTION OF GOLD(Ⅲ) WITH A NEW REAGENT 5-(2-HYDROXY-5-NITROPHENYLAZO)-RHODANINE

作　　者：葛爱景[1] 潘教麦[1] 

机构地区：[1]华东师范大学化学系,上海200062

出　　处：《理化检验（化学分册）》2001年第6期241-243,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：合成了新显色剂对硝基苯酚偶氮罗丹宁 [5 (5 硝基 2 羟基苯偶氮 )罗丹宁 ],并研究了与Au(Ⅲ )的显色反应。在H3PO4 介质及在混合表面活性剂OP +CTMAB存在下 ,Au(Ⅲ )与该试剂形成 1∶5的橙色络合物 ,最大吸收峰λmax=4 80nm ,摩尔吸光系数ε =2 .0× 10 6 L·mol- 1·cm- 1。Au(Ⅲ )含量在 0～ 1.2 μg/2 5ml内符合比耳定律。方法的灵敏度高 ,选择性好 ,直接用于含Au(Ⅲ )废水中金的测定 。A new reagent 5-(2-hydroxy-5-nitrophenylazo)-rhodanine was synthesized. The colour reaction of the new reagent with gold(Ⅲ) was studied. In a H 3PO 4 medium and in the presence of mixed surfactants OP+ CTMAB , gold(Ⅲ) reacts with the new reagent to form an orange 1∶5 complex, having its absorption maxima at 480nm with a mloar absorptivity of 2.0×10 6L·mol -1 ·cm -1 . Beer′s law is obeyed for gold(Ⅲ) in the range of 0～1 2μg/25ml. The proposed method is highly sensitive and selective, which has been applied to the determination of gold(Ⅲ) in waster water with satisfactory results.

关 键 词：吸光光度法 5-(5-硝基-2-羟基苯偶氮)罗丹宁 金 含金废水 测定 显色反应 显色剂 

分 类 号：X132[环境科学与工程—环境科学] X832