Relative FPD Responses for a Systematic Group of Sulfur-Containing Compounds
- 1 February 1978
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Chromatographic Science
- Vol. 16 (2) , 68-73
- https://doi.org/10.1093/chromsci/16.2.68
Abstract
The chemiluminescent response of the flame photometric detector (FPD) is proportional to the sulfur concentration raised to the nth power. The values of the exponential proportionality constant n, and hence the FPD responses, are dependent on the H2 flow rate and the O2/H2 ratio. However, the flow rate of N2 make-up gas does not seem to be a critical parameter in overall FPD sensitivity. Optimum values for the FPD flame gases were found to be: H2 = 80 ml/min, O2/H2 = 0.20-0.30, while N2 may be any convenient flow between 125–175 ml/min. The relative FPD response order for eleven sulfur compounds was found to be both concentration dependent and compound dependent. These response dependencies are due to the variations in the value of n for different sulfur-containing compounds. Previous conflicting FPD response orders to sulfur compounds are explained on the basis of these conclusions.Keywords
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