【摘要】 合成了一种光度荧光新试剂,5-（4-磺酸钠苯基偶氮）-8-（对-甲苯磺酰氨基）喹啉（SPTSQ）,其结构经红外光谱、热重分析和元素分析确证。研究了试剂及其与金属离子的显色反应和荧光反应特性。建立了一种简单、灵敏、快速、选择性的光度测定铜的新方法。在阳离子表面活性剂溴化十六烷基三甲铵存在下,SPTSQ与Cu（Ⅱ）形成2:1的紫红色络合物,其最大吸收峰位于585nm,铜在0～0.8μg·mL^-1浓度范围内符合比尔定律。摩尔吸光系数和桑德尔灵敏度分别为8.5×10⁴L·mol^-1·cm^-1和0.00075μg·cm^-2。研究了不同离子的干扰,该法已用于粗铅和合金样品中微量铜的测定。更多还原

【Abstract】 A new spectrofluorimetric reagent, 5 - (4 - sodium sulphonatephenoylazo) - 8 - (p - tolue-nesulphonamido) quinoline (SPTSQ) has been synthesized, and its identity has been confirmed by infrared spectrometry, thermogravimetly and elemental analysis. Its chromogenic and fluorimetric properties and reactivities with metal ions have been investigated. A simple, rapid , selective and sensitive new spectrophotometric method for determination of copper is developed. In the presence of cetyltrimethy 1 ammonium bromide cationic surfactant (CTMAB), SPTSQ reacts with copper to form a violet - red 1:2 (metal: ligand) complex with an absorption maximum at 585 nm. Beer’ s law is obeyed over the concentration range 0-0.8μg/mL copper. The molar absorptivity and sandell’ s sentitivity of the method are 8.5× 104L·mol-1·cm-1 and 0.000 75μg·cm-2, respectively. The interference of various ions has been studied and the method has been used for the determination of microamount of copper in crude lead and alloys.更多还原