H - Electricity – 01 – J
Patent
H - Electricity
01
J
358/25, 358/9
H01J 49/36 (2006.01) G01N 21/68 (2006.01) G01N 21/73 (2006.01)
Patent
CA 1314636
AN ATMOSPHERIC PRESSURE CAPACITIVELY COUPLED PLASMA ATOMIZER FOR ATOMIC ABSORPTION AND EMISSION SPECTROSCOPY ABSTRACT OF THE DISCLOSURE A novel atmospheric pressure capactively coup- led radio frequency plasma discharge method and apparatus are disclosed. The apparatus is suitable for atomic absorption and emission analysis of small, discrete sample volumes (1-50µl). The plasma can be operated at very low Radio Frequency (RF) input powers (30- 600 W) which allows for optimal conditions for atom resonance line absorption measurements. Sample introduction into the plasma is by an electrically heated tantalum strip vaporizer. The vaporization and dissociation-atomization steps are separately controlled. Analyte absorption takes place in the plasma discharge which is characterized by a long pathlength (10-50 cm) and low support gas flow rate (0.2 to 6 L/m) both of which provide for a relatively long residence time. The optimum RF power for Ag analysis is between 100 and 200 W and the optimum support gas flow rate is about 0.6 L/m. The device exhibits linear calibration plots and provides sensitivities in the range of from 3.5-40 pg.
554178
Blades Michael Walter
Liang Dong Cuan
Oyen Wiggs Green & Mutala Llp
University Of British Columbia
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