摘要
用作者合成的新显色剂6，6″-二甲基-4′-苯基-2，2′∶6′，2″-三联吡啶（TPY）分光光度法测定痕量银，在pH4．0－5．5的HAc－NaAc介质中，该试剂与银形成稳定络合物，其最大吸收波长在324nm处，Ag（I）∶TPY＝3∶2，表观摩尔吸光系数ε＝4．06×104L·（mol·cm）-1，银量在0－0．7mg／L范围内服从比尔定律。该方法灵敏度较高，精密度和准确度较好，用于相纸上与定影液中银的测定，结果满意。
A new colour reaction of Silver with 6,5"-dismethyl-4'-phenyl-2,22:6',2"-terpyridine (TPY) system has been studied by spectrophotometry .In a range of pH 4.0-5.5, Silver seacts with TPY to form a stable somplex with composition ration of 3:2, The molar absorptivity is 4.06×104L·(mol·cm)-1 at 324 nm. Beer's Law is obeyed in the range of 0-0.7mg/L for silver, Precision and accuracy experiments showed that the method was accurate. The method has been applied to determination of silver (I)in photographic paper and fixing bath with satisfactory results.
基金
1998年河南省教委自然科学基础研究项目
关键词
银
TPY
三联吡啶
分光光度法
显色反应
Silver
6.6″-Dismethyl-4'-pheyl-2
2':6'2″-terpyridine
Spectrophotomtry
