In order to improve the accuracy and precision of the determination of organochlorine content in gasoline,basing on combustion-micro-coulometry method,the direct determination method and the difference of total chlorine content minus inorganic chlorine content(difference subtraction method)were optimized by using 0.02 mol/L sodi-um acetate solution as the inorganic chlorine ex-tractant.The results showed that aqueous solution of 0.02 mol/L sodium acetate was used as inorganic chlorine extractant instead of aqueous solution of water-ethanol(isopropyl alcohol),and the content of organic chlorine in gasoline could be directly de-termined by the upper oil phase.The extractant containing 0.10-0.20 mg/L inorganic chloride was used to solve the problem of large deviation of organ-ic chlorine content in some gasoline in the current differential subtraction method.The relative devia-tion of the above two methods was less than 10%.
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