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《Chinese Journal of Analytical Chemistry》 1989-04
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DIRECT DETERMINATION OF VITAMIN B_2 IN UREA BY DIFFERENTIAL DERIVATIVE OSCILLOPOLAROGRAPHY WITH REVERSE SCAN

Yu Yiyun (Beijing Research Institute of Uranium Ore Processing)  
A method is provided for direct determination of vitamin B_2 in urea. It is not necessary to add supporting electrolyte into the sample solution. A linear calibration graph is obtained for vitamin B_2 ranging from 0.25 to 10.0mg/L. The method is simple, rapid and need not to remove oxygen during determination. An avstage relative standard devration (n=6) is better than ±5% and the recovery is 94—101%.
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