The mainly organic acids determination methods are high performance liquid chromatography (HPLC) with UV detection, gas chromatography (GC) and ion chromatography (IC). Many impurities have UV absorption at 210 nm, which bothered the analysis of organic acids. GC determination needs derivatization firstly, which increased operation complexity. Compared with other methods, ion chromatography is an environment-friendly and worker-friendly analysis approach. At the same time, in order to further develop the ap...