You do not provide any details about your samples. Matrix? Conc. level ?
Generally: molecular sieve (5A or 13X or carbon mol. sieve) as a stat. phase. Nitrogen as carrier gas. Quantification: external standard method.
Regards
G
Dear Sir. Concerning your issue about the hydrogen gas quantification calculations detected in TCD . The thermal conductivity detector (TCD) response of hydrogen using helium carrier gas is investigated to obtain a linear response in the 6-60% hydrogen concentration range by GC incorporating either one or two 1.83-m × 3.18-mm stainless steel columns packed with 80/100-mesh HayeSep® D. Replicate data are analyzed using an analysis of variance (ANOVA) for testing the linearity of regression. TCD response curves are generated for replicates of three sets of sample size and TCD temperature: 10 µL and 130°C, 1 mL and 300°C, and 100 µL and 140°C The linearity is limited: 6-32.5% hydrogen and 32.5-66.9% hydrogen for 10 µL, 6-50.3% hydrogen for 1 mL, and nonlinear for 100 µL (0.82-8.7% hydrogen). These results are in sharp contrast to those of Villalobos and Nuss (1965), who report a linear response from 0 to 70% hydrogen with a 50-pL sample. The nonlinear response observed in the present study is hypothesized to be due to better resolution obtained with the HayeSep D columns, producing taller peaks. Consequently, for a given sample size, the maximum concentration in the Gaussian peak surpasses the linear range of the hydrogen-in-helium TCD response, yielding concavedownward curves for small sample sizes. I think the following below links may help you in your analysis:
https://www.agilent.com/cs/library/applications/5991-3199EN.pdf
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.506.7508&rep=rep1&type=pdf
Thanks
Thank you Sir !
Dear Grzegorz sir, we used the same configurations of the column as you mentioned, we got hydrogen signal in TCD detector. My concern is , if we want to quantify the hydrogen gas by considering the total area of the exposed region of the electrode in the solution then how we would do that calculative part?
Some Details of Experiment :
As (2 * 2) cm2 area of the electrode coated with the catalyst fall in the visible range and evolve hydrogen photoelectrochemically in the aqueous media (0.1 M sodium sulfate) and released gas collected in the Tedlor bag and analysed by GC .Now how we will do the quantification of the hydrogen gas?
On the basis of chromatogram you obtain the H2 concentration in units of conc. for your calibration standards. You need to detrmine the volume of the collected gas - multiplication of C and V will give you the amount of H2 produced.
Regards
G
- Badges
- Science topic
- Similar topics
- Engineering
- Petroleum Engineering
- Gas