两性表面活性剂增敏催化光度法测定锰（II）的研究
[The study of amphoteric surfacant sensitizing catalytic spectrophotometric determination of Mn (II)].
作者信息
Xie Zeng-hong, Fu Yan-bin, Chen Guo-nan
机构信息
Department of Chemistry, Fuzhou University, Fuzhou 350002, China.
出版信息
Guang Pu Xue Yu Guang Pu Fen Xi. 2002 Aug;22(4):623-6.
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 thionine by potassium periodate in the presence of nitrilo triaceticacid as an activator and amphoteric surfactant dodecyl dimethylamino acetic acid(DDMAA) as enhancing agent. Dodecye dimethylamino acetic acid (DDMAA) micelles accelerate the reaction and hence increase the sensitivity and selectivity of the determination of Mn(II) compared to reactions taking place in an aqueous medium. The mechanism of related reaction has been discussed. The sensitivity is increased by 7.1 times in the presence of the DDMAA than that in the absence of the DDMAA. The linear ranges of determination are 0-60 ng.(25 mL)-1, the relative standard deviation is 2% (n = 11). The method can be used for the determination of Mn(II) in aluminium alloy and water samples.
已开发出一种用于测定痕量锰（II）的新型催化分光光度法。该方法基于在作为活化剂的次氮基三乙酸和作为增强剂的两性表面活性剂十二烷基二甲基氨基乙酸（DDMAA）存在下，高碘酸钾氧化亚甲蓝。与在水介质中发生的反应相比，十二烷基二甲基氨基乙酸（DDMAA）胶束加速了反应，从而提高了测定锰（II）的灵敏度和选择性。讨论了相关反应的机理。在存在DDMAA的情况下，灵敏度比不存在DDMAA时提高了7.1倍。测定的线性范围为0 - 60 ng·(25 mL)-1，相对标准偏差为2%（n = 11）。该方法可用于测定铝合金和水样中的锰（II）。
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