Catalytic Spectrophotometric Method for the Deterrmination of Trace Manganese(Ⅱ) with Dodecyl Dimethylamino Acetic Acid as Sensitizer
Lin Zhifen; Zheng Zhaosheng (Department of Chemistry, Fuzhou Fuzhou University, Fuzhou 350002)
A new catalytic spectrophotometric method for the determination of trace Mn(Ⅱ ) has been developed. The method is based on the oxidation of naphthol green B(NGB) by potassium periodate in the presence of nitrilotriacetic acid as an activator and dodecyl dimethylamino acetic acid(DDMAA) as sensitizer. The mechanism of related reaction has been discussed. Because of the addition of DDMAA,the sensitivity raised 10. 3 times and 5. 3 times for the different concentration of Mn solution. The linear ranges of determination are 0 ~ 6 .0μg/L, and 6. 0 ~ 14 .0 μg/L, the relative standard deviation is 0. 5% (n = 11 ). The method has been used for the determination of Mn(Ⅱ ) in wine and cereal samples.
【CateGory Index】： O657.3