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一类新偶氮试剂的研究——Ⅱ.试剂2-(8′-羟基喹啉-5′-磺基-7′-偶氮)-1-羟基-8-氨基萘-3,6-二磺酸光度法测定铁(Ⅲ)
Studies on a New Series of Azo ReagentⅡ . Spectrophotometric Determination of Iron( Ⅲ ) Using 2- [ ( 8-Hydroxy-5-sulf o- 7-quinoline )azo]- 1-hydroxy-8-amino-3,6-naphthalenedisulfonic Acid
【摘要】 用新合成的偶氮试剂2-（8′-羟基喹啉-5′-磺基-7′-偶氮）-1-羟基-8-氨基萘-3,6-二磺酸（HQSAH）研究了光度法测定Fe（Ⅲ）的反应条件。Fe（Ⅲ）与试剂在pH4.66（NaAc/HAc缓冲介质）时发生特效络合反应,络合物吸收峰716nm,ε为1.64×104L·mol-1cm-1,络合比为1:2（M:R）,线性范围为0～20μg/25ml,检测限为5.0ng/ml,考察了其它共存离子的干扰,发现除Al（Ⅲ）略有干扰外,其它常见离子均允许大量存在,该方法已直接应用于血样、矿祥和铝合金样中铁的分析,结果令人满意。
【Abstract】 Based on the complex formation of 2-[(8-hydroxy-5-sulfo-7-quinoline)azo]-l-hydroxy-8-amion-3, 6-naphthalenedisulfonic acid with Fe( Ⅱ ) ,a new and specific spectrophotometric method for the determination of Fe( Ⅱ ) is described. The 1 : 2(Fe:R) complex was formed with λmax of 716 nm at pH 4. 66. Beer’s law is obeyed over the range of 0-20μg/25ml for Fe(Ⅱ ) and the detection limit for Fe( Ⅱ ) is 5. 0 ng/ml. Nearly all ions do not interfere with the determination of Fe except aluminium. The proposed method has been directly applied to the determination of trace Fe( Ⅱ )in human blood,ores and aluminium alloy with good results.
- 【文献出处】 分析化学 ,Chinese Journal of Analytical Chemistry , 编辑部邮箱 ,1993年01期
- 【被引频次】2
- 【下载频次】38