Rapid Determination of Se in Se-enriched Tea in Ziyang area of Ankang City by Using Flame Atomic Absorption Spectrometry
ZHANG Wan-feng(Shaanxi Normal University,Xi′an,Shaanxi 710061)
[Objective] The aim of the research was to provide basis for obtaining biological state of organic Se.[Method] The new method of flame atomic absorption spectrometry(FAAS) for determining Se content in Se-enriched tea in Ziyang area of Ankang city was established.[Result] Se content in Se-enriched tea in Ziyang area was 2.033～2.885 mg/kg,higher than that in common tea.But its distribution was not even.With sulfuric acid as blank control,sample solution at different concn.were absorbed to determine its absorbance at the wavelength of 196.09 nm and its regression equation was y=0.004x+0.002(R=0.997 8)with its linear range of 0～40.00 mg/L.Adding 100 ml mixed acid with HNO3 and HClO4 as resolvent reagent,the effect of discomposing Seenriched tea in Ziyang area of Ankang city was significant.Adding matrix modifier Ni(NO3)2 to samples could make the absorbance and stability obviously increase and get rid of the disturbance of Fe,Mg,K,Na and SO42-.[Conclusion] Determining Se content in the tea by this method,the results were exact and credible,which had the guiding action on its application in the production.
【CateGory Index】： S571.1