Analytical Sciences

Determination of Fluorine, Chlorine, Bromine and Iodine by Barrier Discharge Radiofrequency Helium Plasma

Nobuhisa WATANABE,*  Wolfgang BUSCHER,** and Günter BÖHM***

*Osaka City Institute for Public Health and Environmental Sciences, Tohjoh-cho 8-34, Ten-nohji-ku, Osaka 543-0026, Japan
**Institut für Chemo-und Biosensorik, Mendelstr. 7, D-48149, Münster, Germany
***Puls-Plasmatechnik PPT, Feldstr. 56, D-44141, Dortmund, Germany

A determination method of fluorine (F), chlorine (Cl), bromine (Br) and iodine (I) by a barrier discharge radiofrequency helium plasma-atomic emission spectroscopy was developed. A borosilicate glass was wrapped by two copper film electrodes, one of which was earthed, and the other was supplied with a radiofrequency high voltage (98 kHz, 3.2 kV), resulting in a discharge inside of the tube. An optical emission from the discharge tube was introduced to a charge-coupled device(CCD)-spectrometer through an optical fiber, and was monitored in the wavelength range of 730 - 960 nm. The emission lines of F (733.2 nm, 739.9 nm), Cl (833.3 nm, 837.6 nm, 858.6 nm, 894.8 nm, 912.1 nm, etc.), Br (827.2 nm, 882.5 nm, 889.8 nm, 926.5 nm, etc.) and I (905.8 nm) were observed. The linearity of the calibration was determined for F and Cl over the range of 1 - 10 µg, and for Br of 0.1 - 1 µg. The relative emission intensity was in the order of Br > I > Cl > F.

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