Shrivas Kamlesh, Wu Hui-Fen
Department of Chemistry, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan.
Anal Chim Acta. 2008 Nov 3;628(2):198-203. doi: 10.1016/j.aca.2008.09.011. Epub 2008 Sep 11.
Oxidized multiwalled carbon nanotubes (O-MWCNT) are used as preconcentrating probes for the quantitative determination of cationic surfactants (CS(+)) in water samples using atmospheric pressure matrix-assisted laser desorption/ionization mass spectrometry (AP-MALDI-MS). The method is based on the electrostatic interactions of positively charged CS(+) with the negatively charged O-MWCNT for the preconcentration and isolation of analytes from sample solutions. The O-MWCNT/AP-MALDI-MS is performed for the determination of CS(+) in river- and waste-water samples. The optimum extraction efficiency of CS(+) is observed for 7 min of contact time at 1.0 mg dosage of O-MWCNT at pH 7.0. The acceptable relative recovery percentage in water sample is obtained in the range 90.5-97.8% with relative standard deviation (R.S.D.)<14.5%. The results suggested that the newly proposed method is rapid, accurate and effective and could be successfully applied for the enrichment and quantitative determination of CS(+) in water samples.
氧化多壁碳纳米管（O-MWCNT）被用作预浓缩探针，采用常压基质辅助激光解吸/电离质谱（AP-MALDI-MS）对水样中的阳离子表面活性剂（CS(+)）进行定量测定。该方法基于带正电荷的CS(+)与带负电荷的O-MWCNT之间的静电相互作用，用于从样品溶液中预浓缩和分离分析物。采用O-MWCNT/AP-MALDI-MS对河水和废水样品中的CS(+)进行测定。在pH 7.0、O-MWCNT用量为1.0 mg、接触时间为7 min时，观察到CS(+)的最佳萃取效率。水样中可接受的相对回收率在90.5-97.8%范围内，相对标准偏差（R.S.D.）<14.5%。结果表明，新提出的方法快速、准确、有效，可成功应用于水样中CS(+)的富集和定量测定。
