原油中盐含量批量化分析方法研究

建立了原油盐含量的批量化分析方法，通过选用温控摇床等设备实现了样品的批量化萃取，之后使用库仑滴定法测定。对萃取时间和萃取试剂进行了系统性的优化实验，最终选定10 mL乙醇/水(1/3, v/v)溶剂萃取3 h。此方法的加标回收率为98％~101％，10次平行测定结果的相对平均偏差小于3%，定量下限为0.1 ?g/g。将此方法对实际样品的测定结果与SY/T 0536方法进行对比，相对偏差小于6%。

MASS ANALYSIS TECHNIQUE FOR DETERMINATION OF SALT CONTENT IN CRUDE OIL

A high efficiency mass analysis technique has been established for the determination of salt content in crude oils. The oil is extracted by 10 ml of the mixture of ethanol/water (1/3, v/v) in a thermostatic shaking table for 3 hours and then detected by coulometric titration method. The test parameters, such as extract time and extract reagent, are optimized. Under the optimal conditions, the recoveries of standard addition in samples are in the range of 98％-101％ with RSDs of (10 times parallel tests) less than 3% and the lower limit of detection is 0.1 ?g/g．Finally，this method is applied to the analysis of salt in real samples and the results compared with that of the method of SY/T 0536 indicate that the relative deviation of the new method is less than 6%.