Published:Journal of Chromatographic Science,
ISSN 0021-9665Volume
38, Number 11, November 2000, pp. 483-488
An
Improved Configuration of a Moving Wire Transport Detector R.P.W.
Scott1, C. Little2, and M. de la Peña2
1Chemistry Department, Georgetown University, Washington, DC 20057-1014 and
2Scientific Detectors Ltd., 7 Beaumont Business Center, Beaumont Close, Banbury,
Oxon OX16 7TN, United Kingdom
An improved design of the transport detector is described that
uses a pre-oxidized titanium ribbon as the transport medium. The titanium ribbon
has a high loading capacity that permits a large proportion of the total column
eluent to be taken into the sensing system. The solute is sensed by pyrolysis
and the subsequent detection of pyrolysis products by a miniature argon detector.
The pyrolyzer and sensor system is designed to ensure that all the pyrolysis
products enter the detector with minimum dilution and band dispersion. As a
result, the sensitivity of the detector (or minimum detectable concentration)
has been reduced by approximately two orders of magnitude compared with the
original design. The sensitivity of the system described to sucrose is 8 x 10–8
g/mL, which is similar to the sensitivity of the fixed-wavelength UV detector
to benzene (approximately 5 x 10–8 g/mL). It would appear that the new
design has potentially a sensitivity at least an order of magnitude lower than
that reported here.
Reproduction
of editorial content of this journal is prohibited without publisher’s
permission.
This
article is available in its entirety by fax for $4.00 per
page.
Visa or MasterCard accepted.
To
order electronicallyclick here or call: 847-647-2900 ext. 1323 or fax request to: 847-647-1155.
Please
indicate JCS volume and issue along with
page numbers.
