Determination of ordinary anions in boric acid Yongxin Chen (Department of Chemistry ,Xixi Campus, Zhejiang University, Hangzhou 310027) Abstrace: In this paper, the ordinary anions were determined by using ion chromatography. By using boric acid and KOH, which was generated from EGC, ionic strength can be controlled easily and gradient elution can also be performed. After suppression very low conductance background can be obtained and sensitivity of anions has been greatly improved. With this method, good linear relationship, sensitivity and reproducibility were obtained. Detection limits of these anions were 0.001,0.001,0.004,0.004,0.003,0.01,0.04mg/L respectively. Rate of recovery were 98.5,99.4,100.0,99.7,99.7,101.2,100.1 % respectively. Keywords: ion chromatography , boric acid, anion