Zaijun Li, You Fan, Zhongyun Liu, Jian Tang
College of Chemical and Materials Engineering, Southern Yangtze University,(1) Huihe Road 170, Wuxi 214036, PR China.
Talanta. 2004 Jun 17;63(3):647-51. doi: 10.1016/j.talanta.2003.12.007.
A spectrophotometric method was developed for the determination of iron(III)-dimethyldithiocarbamate (ferbam) by concerting it into an iron(III)-9-(4-carboxyphenyl)-2,3,7-trihydroxyl-6-fluorone complex. In NH(3)-HAc buffer solution (pH 6.5), the reagent reacts with ferbam to form a blue complex with a maximum absorption peak at 640nm. The reaction can be completed rapidly at room temperature and the absorbance is stable for at least 24h. The apparent molar absorption coefficient, Sandell's sensitivity of the complex, the detection limit and the relative standard deviation were found to be 1.06x10(5)lmol(-1)cm(-1), 3.9ngcm(-2), 2.2ngml(-1) and 1.06%, respectively. From 0 to 75mug of ferbam in 25ml solution the absorbance obeyed Beer's law. The effect of foreign ions and other dithiocarbamates were also studied in detail. The results indicated that all coexisting ions examined can be tolerated in considerable amounts, especially other dithiocarbamates such as ziram and zineb, which always interfere with the determination of ferbam in the literature. The proposed method is very sensitive, selective and simple, it has been applied to determine ferbam in commercial samples.
建立了一种分光光度法，通过将铁（III）-二甲基二硫代氨基甲酸盐（福美铁）转化为铁（III）-9-（4-羧基苯基）-2,3,7-三羟基-6-氟酮配合物来测定福美铁。在NH(3)-HAc缓冲溶液（pH 6.5）中，该试剂与福美铁反应形成一种蓝色配合物，在640nm处有最大吸收峰。该反应在室温下可快速完成，吸光度至少24小时稳定。该配合物的表观摩尔吸收系数、桑德尔灵敏度、检测限和相对标准偏差分别为1.06×10(5)lmol(-1)cm(-1)、3.9ngcm(-2)、2.2ngml(-1)和1.06%。在25ml溶液中，0至75μg的福美铁吸光度符合比尔定律。还详细研究了外来离子和其他二硫代氨基甲酸盐的影响。结果表明，所检测的所有共存离子都能大量耐受，尤其是其他二硫代氨基甲酸盐如代森锌和代森锰锌，它们在文献中总是干扰福美铁的测定。该方法非常灵敏、选择性好且操作简单，已应用于商业样品中福美铁的测定。
