论文部分内容阅读
武汉大学化学系余席茂等合成了多种不对称变色酸双偶氮类试剂,已用于高灵敏光度法测定稀土、钍及锆等元素,其中2-(2-羧基苯偶氮)-7-(2,6-二溴-4-氯苯偶氮)-1,8二羟基萘-3,6二磺酸(简称DBC偶氮羧)是新合成的试剂之一,研究尚少。中南民族学院化学系詹国庆、田四清研究铝-DBC偶氮羧的显色反应,结果表明,在pH=6.0的六次甲基四胺缓冲介质中,铝与DBC偶氮羧形成1:1的蓝紫色配合物,其最大吸收波长为622nm,摩尔吸光系数为4.0×10~4。方法简便,选择性好,可不经分
A number of asymmetric chromotropic acid disazo reagents have been synthesized by Yu Ximao, Department of Chemistry, Wuhan University, and have been used for the determination of rare earth, thorium and zirconium with high sensitivity spectrophotometry. Among them, 2- (2-carboxyphenylazo) -7- (2,6-Dibromo-4-chlorophenylazo) -1,8-dihydroxynaphthalene-3,6-disulfonic acid (DBC azocarboxylate) is one of the newly synthesized reagents. Zhan Guoqing, Tian Siqing (Department of Chemistry, South-Central University for Nationalities, Beijing) The color reaction of aluminum-DBC azocarboxylato was studied. The results showed that the aluminum and DBC azocarboxylate formed 1: 1 The blue-violet complex has a maximum absorption wavelength of 622 nm and a molar absorptivity of 4.0 × 10 -4. The method is simple, good selectivity, without any points