H. Snijders et al., DESIGN AND OPTIMIZATION OF A NOVEL TYPE NITROGEN-PHOSPHORUS DETECTOR FOR CAPILLARY GAS-CHROMATOGRAPHY, Journal of chromatography, 732(1), 1996, pp. 51-61
Citations number
12
Categorie Soggetti
Chemistry Analytical","Biochemical Research Methods
The design and optimization of a novel type alkali flame ionization de
tector (AFID) for capillary gas chromatoraphy is presented. The design
differs in that the alkali salt is continuously introduced, as a solu
tion in water, into the detector by means of a liquid chromatographic
syringe pump. This design permits continuous refreshment of the enhanc
ement source and circumvents the need of source replacement, thereby e
liminating detector response fatigue over time. Modification of an exi
sting nitrogen-phosphorus detector (NPD) to allow direct introduction
of the alkali salt into the detector will be described. Next, importan
t operational parameters such as the location of introduction, type an
d concentration of the salt and the flow of the various detector gasse
s are optimized experimentally with regard to detector sensitivity, se
lectivity, minimum detectability and noise level. Moreover the lineari
ty, reproducibility and stability of the detector are evaluated. It wi
ll be shown that the new detector design exhibits excellent response c
haracteristics for phosphorus compounds which are comparable to or bet
ter than those observed with commercially available AFIDs or NPDs. Fin
ally, the performance of the detector will be demonstrated by two envi
ronmental applications.