INDUSTRY APPLICATION SOLUTIONS I Choosing appropriate dilution ratio to dilute oil field waste water, the diluent was filtered by 0.22 um microporous membrane and treated by IC-RP column.If the sample contains heavy metal and transition metal ions, it must be treated by IC-Na column . Using CIC-D120 ion chromatograph, SH-AC-3 anion column, 3.6 mM Na2C03+4.5 mM NaHC03 eluent and bipolar pulse conductance method,under the recommended chromatographic conditions,the chromatogram is as follows. 2. Oil analysis Based on the flammability of petroleum, chlorine, nitrogen and sulfur in petroleum products are converted into hydrides and oxides at high temperature by combustion furnace, then absorbed by alkali liquor. Using CIC-D120 ion chromatograph, SH-AC-3 anion column, 3.6 mM Na2C03+4.5 mM NaHC03 eluent and bipolar pulse conductance method, under the recommended chromatographic conditions, the chromatogram is as follows.