论文部分内容阅读
钍的分光光度法已有综述报导,一般认为偶氮胂Ⅲ是测钍的良好显色剂。但是该试剂测钍时,锆、铀、钛等有严重干扰,往往需要经萃取分离,甚至经离子交换分离方能进行测定。近年来,又提出用偶氮胂M、偶氮胂-K。对乙酸基偶氮胂等试剂测定钍,这些试剂虽各有优点,但也都存在一定的局限性。本文研究了新试剂偶氮硝膦-mN〔3-(4-硝基-2-膦酸苯偶氮)-6-(3-硝基苯偶氮)-4,5-二羟基-2,7-萘二磺酸〕与钍的分光光度性能。NPA-mN与钍显色反应的特点是:操作简便,发色迅速,对比度大,发色酸度强,允许酸度范围宽,试剂与络合物均十分稳定,比尔定律
Thorium spectrophotometry has been reviewed, it is generally believed that arsenazo III is a good developer for thorium. However, when the reagent is used to measure thorium, zirconium, uranium, titanium and the like have serious interference and often need to be separated by extraction and even can be measured by ion exchange separation. In recent years, it has also been proposed to use arsenazo M, arsenazo-K. Acetic acid arsine and other reagents for the determination of thorium, although these reagents have their own advantages, but also have some limitations. In this paper, the new reagent azo nitronazo-mN 〔3- (4-nitro-2-phosphonophenylazo) -6- (3-nitrophenylazo) -4,5-dihydroxy- Spectrophotometric Properties of 7-Naphthalenedisulfonic Acid and Thorium. NPA-mN and thorium color reaction is characterized by: easy to operate, rapid color development, large contrast, strong color and acidity, allowing a wide range of acidity, reagents and complexes are very stable, Beer’s Law