增效试剂在动力学分析法中的应用研究 Ⅱ.锰(Ⅱ)-氨三乙酸-十二烷基硫酸钠-高碘酸钾-罗丹明B催化体系  

The Study of Enhancing Agent in Kinetic Analytical Method II .A New Mn( II ) -Potassium Periodate- Nitrilo Triacetic Acid - Rhodamine B - Sodium Dodecyl Sulphate Catalytic Spectrophotometric System

作　　者：郑肇生[1] 景卫国[1] 

机构地区：[1]福州大学化学系,福州350002

出　　处：《化学学报》1996年第10期1016-1022,共7页Acta Chimica Sinica

基　　金：福建省自然科学基金资助课题

摘　　要：基于存在活化剂氨三乙酸和增敏剂十二烷基硫酸钠,锰(Ⅱ)催化高碘酸钾氧化罗丹明B的反应,拟定了测定痕量锰的新催化光度法.讨论了有关的反应机理.本法由于添加了表面活性剂,灵敏度提高3.4倍.测定锰含量线性范围为10～120ng·25mL^(-1),相对标准偏差为2.6%(n=9),检出限为8.O×10^(-11)g·mL^(-1).用于测定水样和酒样中锰.A new catalytic spectrophotometric method for the determination of trace amount of Mn( II ) has been developed. The method is based on the oxidation of rhodamine B by potassium periodate in the presence of nitrilo triaceticacid as an activator and sodium dodecyl sulphate as sensitizer. The mechanism of related reaction has been discussed. As the addition of sodium dodecyl sulphate, the sensitivity raise 3.4 times. The linear range of determination is 10~120ng/25mL for Mn( II ). The detection limit is 8. 0 ×10-11g/mL,the relative standard deviation is 2.6 % (n =9). The method can be used for the determination of Mn( II ) in water and wine samples.

关 键 词：催化光度法 表面活剂 锰 动力学分析 增效试剂 

分 类 号：O647.2[理学—物理化学] O614.711[理学—化学]