FOOD SCIENCE ›› 2008, Vol. 29 ›› Issue (3): 383-385.

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Simultaneous Analysis of F-、Cl-、SO42-、NO3- in Tea by Ion Chromatography

 SHI  Yuan-Zhi, YANG  Yi-Yang, RUAN  Jian-Yun, MA  Li-Feng, ZHANG  Lei, HAN  Wen-Yan, WANG  Fang   

  1. 1.Key Laboratory of Tea Chemical Engineering, Ministry of Agriculture, Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China; 2.Tea Research Institute of Nanjing Agricultural University, Nanjing 210095, China
  • Online:2008-03-15 Published:2011-08-24

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Abstract: An ion chromatographic method for the simultaneous analysisF-、Cl-、SO42-、NO3-in tea samples was developed with ICS-2000 system. Conditions for separation and detection of F-、Cl-、SO42-andNO3-by gradient ion-chromatography with suppressed conductivity detection were studied. The gradient elution procedure was optimized as 8-44-52-8 mmol/L and the flow rate as 1.0 ml/min. It was found that the correlation coefficients of linear regression equations were abover 0.9999, and the detection limits of those anions were in the range of 0.01-0.05 mg/L, the recoveries of the method were between 88.6% to 107.5%. The method could be applied to the analysis of the batch tea samples with satisfactory results and speediness.

Key words: ion-chromatography, gradient elution, F-、Cl-、SO42-、NO3-, simultaneous analysis