2-[2′-苯并噻唑偶氮]-1,8-二羟基萘-3,6-二磺酸的合成及与铝的显色反应研究  

Synthesis of 2-(2-Benzothiazolylazo)-1,8-dihydroxynaphthalene-3,6-disulfonic Acid and Study on Its Colour Reaction With Aluminum

作　　者：夏心泉[1] 赵书林[1] 马厚蓉[1] 杨宾 李薇 

机构地区：[1]沈阳化工学院,沈阳110021

出　　处：《分析化学》1995年第4期434-437,共4页Chinese Journal of Analytical Chemistry

摘　　要：本文合成了新的显色试剂2-〔2’-苯并噻唑偶氮〕-1,8-二羟基萘-3,6-二磺酸,并研究了与铝的显色反应.在CTMAB存在下,铝与试剂于pH7.0～8.0的缓冲溶液中形成稳定的深紫红色络合物,组成为Al(Ⅱ):R=1:2表观摩尔吸光系数为1.46×10~5L·mol_(-1)·cm^(-1).铝浓度在0～5.0 μg/25mL范围内符合比尔定律.该方法灵敏度高,选择性好,并用于测定低合金钢、稀土硅镁合金和硅铁等试样中的微量铝.A chromogenic reagent 2-(2-benzothiazolylazo)-1, 8-dihydroxynaphthalene-3, 6-disulfonic acid (BTAC), was synthesized and its colour reaction with aluminum was studied spectrophotometrically. In the presence of CTMAB, aluminum reacts with BTAC to form a stable complex in a buffer solution at pH 7. 0-8. 0, the ratio of Al to BTAC in the complex was found xto be 1 : 2. The apparent molar absorptivity is 1. 46×105 · L · mol-1 · cm-1 at 640 nm. Beer' s law is obeyed over the range from 0 to 5. 0 μg/25 mL for aluminum. Themethod is highly sensitive and selective. The method has been applied to the direct determination of aluminum in the practical samples with satisfactory results.

关 键 词：分光光度法 铝 BTAC CTMAB 

分 类 号：O625.62[理学—有机化学] O614.31[理学—化学]