Objective:To determine the content of cobalt in vitamin B12 tablets by air-acetylene flame atomic absorption spectrometry.Methods:The detection wavelength is 240.63 nm,the lamp current is 4.0 mA,the slit width is 0.2 nm,the gas flow rate is 1.3 L/min,and the auxiliary gas flow rate is 13.5 L/min.The content of cobalt in three kinds of vitamin B12 tablets is determined and compared by standard curve method.Results:The linear relationship between cobalt concentration and absorbance is good(r=0.9994)in the range of 0.01～0.20 mg/L,and the recovery rate is 97.5%to 98.3%.The cobalt content of the 3 batches of samples is 97.8%to 98.9%of the labeled amount.Conclusion:The method is simple,accurate,less interference and stable.It can be used for the determination and quality control of cobalt in vitamin B12 tablets.
NETL
NSTL
万方数据
