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用胶束电动毛细管色谱法测定了同一井位、不同深度岩屑样品中的苯、甲苯、乙苯和二甲苯化合物。采用 50 μm× 57cm毛细管柱 ,以 50mmol/L十二烷基硫酸钠 - 2 0mmol/L四硼酸钠溶液 (pH 9 1 6)作为缓冲溶液 ,电压 2 5kV ,检测波长 2 0 0nm ,1 6min内 ,苯、甲苯、乙苯和二甲苯可获得良好的分离。用峰面积定量 ,线性范围为 2～ 1 0 0mg/L ,最小检测浓度分别为 :0 75mg/L苯 ;0 45mg/L甲苯 ;0 39mg/L乙苯 ;0 1mg/L邻 二甲苯 ;0 31mg/L对 二甲苯。加标回收率分别为 :苯 1 0 1 % ,甲苯 99% ,邻二甲苯 97% ,乙苯 95% ,对二甲苯 1 0 0 %。方法用于实际岩屑样品的测量 ,获得各含量范围在 0 .0x～ 0 .xμg/ g ;3次平行测定的RSD在 3 3%～ 34%。
Determination of benzene, toluene, ethylbenzene and xylene compounds in rock chip samples at the same well location and at different depths by micellar electrokinetic capillary chromatography. A 50 μm × 57 cm capillary column was used with 50 mmol / L sodium dodecyl sulfate - 20 mmol / L sodium tetraborate solution (pH 9 1 6) as a buffer solution at a voltage of 25 kV at a detection wavelength of 200 nm for a period of 16 min Good separation is possible with benzene, toluene, ethylbenzene and xylene. The linear range was 2 ~ 100 mg / L, the minimum detectable concentrations were 0 75 mg / L benzene, 0 45 mg / L toluene, 0 39 mg / L ethylbenzene, 0 1 mg / L o- 31 mg / L p-xylene. The spiked recoveries were: benzene 1 0 1%, toluene 99%, o-xylene 97%, ethylbenzene 95%, p-xylene 1 0 0%. The method was used to measure the actual cuttings samples, and the range of each content was 0 .0x ~ 0 .xμg / g. The RSDs of three parallel measurements ranged from 33% to 34%.