School of Chemistry, The University of Melbourne, VIC 3010, Australia.
Ultrason Sonochem. 2012 May;19(3):435-9. doi: 10.1016/j.ultsonch.2011.10.014. Epub 2011 Oct 31.
A novel technique for anionic surfactant assisted separation and preconcentration of metal cations was developed using ultrasound induced nebulization at MHz frequency. The ions of copper, zinc, cadmium, and calcium were used as model analytes. Analysis of the aerosol using flame atomic absorption spectrometry showed enrichment factors for the metal ions studied between 5 and 8, when dilute solutions containing sodium dodecylsulfate and the metal ions were nebulized. The mechanism of metal ion enrichment was explained based on surfactant adsorption and the droplet model for aerosol droplets. It was demonstrated that further increase in the enrichment factor could be achieved by increasing the ultrasound frequency, thus producing smaller droplets.
采用兆赫兹频率超声雾化技术，开发了一种新型阴离子表面活性剂辅助分离和富集金属阳离子的技术。以铜、锌、镉和钙离子作为模型分析物。使用火焰原子吸收光谱法对气溶胶进行分析，结果表明，当含有十二烷基硫酸钠和金属离子的稀溶液被雾化时，所研究的金属离子的富集因子在 5 到 8 之间。根据表面活性剂吸附和气溶胶液滴的液滴模型，解释了金属离子富集的机理。结果表明，通过增加超声频率来产生更小的液滴，可以进一步提高富集因子。
