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中文摘要：
考察了样品预处理、背景缓冲溶液pH、十二烷基硫酸钠（SDS）浓度、进样时间对苯甲酸测定过程中的富集效果的影响。结果显示：在电泳缓冲溶液为20mmol／L硼砂＋60mmol／L十二烷基硫酸钠（pH=9．30），紫外检测波长214nm，分离电压18kV时，富集倍数可达150倍。在线推扫富集胶束电动色谱法减少了样品处理的繁琐过程，操作简单，成本低。大大缩短了分析周期，弥补了毛细管电泳测定微量组分的不足。
英文摘要：
The effects of sample pretreatment, pH in background solution, SDS concentration and injection time were investi- gated. The results indicated that when the sample was analyzed with 20 mmol/L phosphate ＋ 60 mmol/L SDS （pH = 9.30） as the running buffer, UV detector wavelength = 214 nm and the run voltage = 18 kV, up to 150-fold concentration of benzoic acid could be obtained. It was concluded that the trace in the sample could successfully be determined by the micellar electrokinetic chromatography （MEKC） and the online sweeping technique.
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