Journal
ANALYST
Volume 137, Issue 13, Pages 3111-3118Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2an35050e
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Funding
- National Natural Science Foundation of China [21075110, 20890020]
- Analysis and Measurement Foundation of Zhejiang Province [2011C37063]
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A suction-free interfacing method was developed for microchip electrophoresis hyphenated with inductively coupled plasma mass spectrometry (MCE-ICP-MS). The hyphenated system was composed of a microchip, a demountable capillary microflow nebulizer (d-CMN) combined with a heated single pass spray chamber, a negative pressure sampling device, a high voltage power supply, a syringe pump and an ICP-MS. To eliminate the nebulizer suction generated by the pneumatic nebulizer and to ensure that the makeup solution flowed into the nebulizer, two porous polymer plugs were fabricated in the microchip. As a result, reasonably true electropherograms were obtained when compared to the CE separation performed in the traditional MCE-ICP-MS mode without porous polymer plugs. Electrophoretic separation of I I- and IO3- was achieved within 25 s in a microchip with an effective separation length of only 15 mm at an electric field of 857 V cm(-1) using 10 mmol L-1 borate (pH 9.2) as the running buffer. A resolution of 1.3 was obtained and the absolute detection limits for I- and IO3- were 0.12 and 0.13 fg, respectively. The precisions (RSD, n = 10) of the migration time and peak height for I- and IO3- were in the range of 1.1-1.6% and 2.5-2.8%, respectively. Two table salt samples were analyzed by an external calibration method. The iodate contents were in accordance with their labeled values. The recoveries of I- and IO3- in the table salt samples were in the range
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