固相萃取/高效液相色谱法同时测定水中4种直链烷基苯磺酸钠

建立了水中4种直链烷基苯磺酸钠的固相萃取/高效液相色谱的测定方法.样品经高速冷冻离心,用MAX复合阴离子交换小柱净化富集后直接进样.在以乙腈-100 mmol/L乙酸铵(体积比73:27)为流动相,流速1 mL/min,柱温30 ℃,检测波长225 nm,进样体积10 μL的条件下,4种直链烷基苯磺酸钠得到很好的分离....

Simultaneous Determination of Four Kinds of Linear Alkyl Benzene Sulfonates by Solid Phase Extraction/High Performance Liquid Chromatography

A solid phase extraction coupled with high performance liquid chromatographic(SPE/HPLC) method was established for the determination of 4 kinds of sodium n-alkyl benzene sulfonates in water.The samples were refrigerated and centrifuged,then purified and enriched with MAX complex anion exchange column.Four sodium n-alkyl benzene sulfonates were successfully separated by HPLC using acetonitrile-100 mmol/L ammonium acetate(73∶27,by volume) as mobile phase with a flow rate of 1 mL/min,column temperature of 30 ℃,detection wavelength of 225 nm and injection volume of 10 μL.Under the optimal conditions,the calibration curves were linear in the range of 10-50 mg/L for sodium undecylbenzene sulfonte and sodium N-tridecylbenzene sulfonate with detection limits of 10 mg/L,and 5-25 mg/L for sodium dodecylbenzene sulphonate and sodium tetradecylbenzene sulfonate with detection limits of 5 mg/L.The spiked recoveries were in the range of 86%-98% with relative standard deviations(RSDs) of 2.9%-7.4%.