Ion chromatography is a kind of high performance liquid chromatography, so it is also called high performance ion chromatography (HPIC) or modern ion chromatography. It is different from traditional ion exchange column chromatography mainly because that resin has high cross-linking degree and low exchange capacity, the sample volume is very small, and normally, a plunger pump is used to pump eluent for on-line automatic continuous conductivity detection of leachate.