Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1560, Issue -, Pages 71-77Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2018.05.028
Keywords
Ammonia; Trace water; Calcium carbide; Gas chromatography; FTIR spectrometry; Reaction kinetics
Funding
- RFBR [16-38-60174 mol_a_dk]
- Russian Federation [MC-2924.2017.8, MD-5414.2016.8]
- Ministry of Education and Science of the Russian Federation [11/17-01.10]
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The current study focuses on the processes involved during the flow conversion of water into acetylene in a calcium carbide reaction cell for the trace moisture analysis of ammonia by reaction gas chromatography. The factors negatively affecting the reproducibility and the accuracy of the measurements are suggested and discussed. The intramolecular reaction of the HO-Ca-C (math)CH intermediate was found to be a side reaction producing background acetylene during the contact of wet ammonia gas with calcium carbide. The presence of the HO-Ca-C (math)CH intermediate among the reaction products is confirmed by an FTIR spectral study of calcium carbide powder exposed to wet gas. The side reaction kinetics is evaluated experimentally and its influence on the results of the gas chromatographic measurements is discussed in relation to the determination of the optimal operating parameters for ammonia analysis. The reaction gas chromatography method for the trace moisture measurements in an ammonia matrix was experimentally compared to an FTIR long-path length gas cell technique to evaluate the accuracy limitations and the resource intensity. (C) 2018 Elsevier B.V. All rights reserved.
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