用离子色谱法同时测定茶叶中的F^-、Cl^-、SO4^2-、NO3^-  

Simultaneous Analysis of F^-,Cl^-,SO_4^(2-) and NO_3^- in Tea by Ion Chromatography

作　　者：石元值[1] 杨亦扬[1,2] 阮建云[1] 马立峰[1] 张磊[1] 韩文炎[1] 王方[1] 

机构地区：[1]中国农业科学院茶叶研究所,农业部茶叶化学工程重点实验室,浙江杭州310008 [2]南京农业大学茶叶研究所,江苏南京210095

出　　处：《食品科学》2008年第3期383-385,共3页Food Science

基　　金：农业部行业专项项目(nyhyzx07-021);农业部“948”项目(2006-G16);浙江省科技项目(ZJ2006C22071)

摘　　要：利用美国戴安公司免试剂离子色谱系统(ICS-2000系统),采用KOH梯度离子色谱法和抑制电导检测器,建立了同时测定茶叶中F-、Cl-、SO42-、NO3等四种重要的阴离子的分析方法。研究了茶叶中F-、Cl-、SO42-、NO3四种阴离子的色谱分析条件,建立了8-44-52-8mmol/L的KOH梯度淋洗程序,流速为1.0ml/min。结果表明:该方法回归方程的线性相关系数达到0.9999以上,各组分的检出限在0.01～0.05mg/L之间,回收率在88.6%～107.5%之间。用本方法用于实际茶叶样品中F-、Cl-、SO42-、NO3等无机酸阴离子的分析,简便、实用,并且快速、准确,所得结果令人满意。An ion chromatographic method for the simultaneous analysis F^-、Cl^-、SO4^2-and NO3^- in tea samples was developed with ICS-2000 system. Conditions for separation and detection ofF^-、Cl^-、SO4^2-、 and NO3^- by gradient ionchromatography 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.

关 键 词：离子色谱法 梯度淋洗 F^-、Cl^-、SO4^2-、NO3^- 同时测定 

分 类 号：TS207.3[轻工技术与工程—食品科学]