4-(2-噻唑偶氮)连苯三酚与铁Ⅱ显色反应的研究及应用  

Study on the chromogenic reaction of ironⅡ with reagent 4-(2-thiazolylazo)-1,2,3-trihydroxybenzene and its applications

作　　者：马卫兴[1] 钱保华[1] 李善忠[1] 许兴友[1] 

机构地区：[1]淮海工学院化学工程系,江苏连云港222005

出　　处：《冶金分析》2005年第2期24-26,共3页Metallurgical Analysis

基　　金：江苏省高校自然科学研究计划资助项目(01KJB150011);淮海工学院学科基金资助项目(XK200310)。

摘　　要：在吐温40存在下,用分光光度法研究了新试剂4 (2 噻唑偶氮)连苯三酚(TATB)与铁的显色反应性能。在pH8 0～9 0范围内,4 (2 噻唑偶氮)连苯三酚与铁形成3∶1的蓝色络合物,该络合物的最大吸收波长λmax在620nm处,在25mL溶液中铁质量在0～30μg服从比尔定律,测定的表观摩尔吸光系数ε620为4 30×104,所拟方法用于纯铝及铝合金样品中微量铁的测定,结果满意。A new reagent 4-(2-thiazolylazo)-1,2,3-trihydroxybenzene (TATB) was synthesized,and the chromogenic reaction of iron *' with the new reagent TATB has been studied in the presence of Tween-40 by the spectrophotometric method in detail.The results show that in the medium of pH 8.0-9.0,iron*' reacts with the reagent TATB to form a stable blue complex (1∶3).The maximum absorption of this complex is at 620 nm with an apparent molar absorptivity ε_(620) of 4.30×10~4 L·mol^(-1)·cm^(-1).Beer's law is obeyed in the iron *' concentration range of 0-30 μg/25 mL.The proposed method has been applied to the direct determination of micro amounts of iron in pure aluminium and aluminium alloy standard samples with satisfactory results.

关 键 词：连苯三酚 噻唑偶氮 显色反应 铁(Ⅱ) 表观摩尔吸光系数 应用 最大吸收波长 分光光度法 反应性能 铁(Ⅱ) 比尔定律 合金样品 络合物 max 620 微量铁 测定 溶液 

分 类 号：O657.32[理学—分析化学]