Separation of Alkylphenols in Oil Field Water by Micellar Electrokinetic Chromatography
油田水中烷基酚的胶束电动色谱分离

The abundance of alkylphenols in the system of water, oil and rock is of great geochemistry significance. The analysis of alkylphenols in oil field water using micellar electrokinetic chromatography with UV detection is described. The different variables that affect separation were studied and optimized. The results show that better separation was obtained with the borate concentration of 47.5 mmol/L, the SDS concentration of 70.0 mmol/L, pH 9.15, separation current of 100 microA, capillary temperature 20 degrees C. The organic additive(beta-CD) could partly improve separation. Water sample was introduced into the capillary by pressure of 5 kPa for several seconds. Detection wavelength was 200 nm and reference wavelength at 350 nm for all experiments. For the oil field water sample, the reproducibility of directly injected oil field water after filtration through a membrane filter of 0.45 micron pore size was far from good and it's concentrations of alkylphenols were too low to be detected. Therefore, a method of separation and enrichment by a column packed with tributyl phosphate(TBP) extraction resin was applied for analysis of TZ4 oil field water. Qualitative analysis show that there are phenol, o-cresol, m-cresol and p-cresol in this water sample and phenol is the main component and it's quantity is more than other alkylphenols. It's recoveries from the oil field water were 91.5%-95.3%. The results were satisfactory.