Evaluation of on-line pyrolysis two-dimensional gas chromatography time-of-flight mass spectrometry (Py-GC × GC-ToFMS) on whole sediments from a Mediterranean sapropel sequence was written by Payeur, Amy L.;Meyers, Philip A.;Sacks, Richard D.. And the article was included in Organic Geochemistry in 2011.Quality Control of 3-Ethylthiophene This article mentions the following:
Anal. of the mol. composition of the organic matter (OM) from whole sediment samples can avoid anal. bias that might result from isolation of components from the sediment matrix, but has its own anal. challenges. We evaluated the use of GC × GC-ToFMS to analyze the pyrolysis products of six whole sediment samples obtained from above, within and below a 1 million year old OM-rich Mediterranean sapropel layer. We found differences in pyrolysis products <n-C22 between the OM-rich sapropel samples and the OM-poor background marls. The presence of alkyl pyrroles, probably derived from chlorophyll, in pyrolyzates of the sapropels but not in those of the marls suggests that higher marine productivity and greater OM preservation accompanied deposition of the sapropels. Detection of tetra-Me benzenes considered to be pyrolysis products of isorenieratene in the sapropel samples is evidence that nitrogen-fixing green sulfur bacteria contributed to the high productivity. Greater abundances of shorter chain aliphatic hydrocarbons, pyrroles, furans and alkyl aromatics in the pyrolyzates of sapropel samples relative to the marls confirm better preservation of marine OM in the sapropels. In addition, the presence of greater amounts of thiophenes in the sapropels than in the marls is consistent with the existence of euxinic conditions during sapropel deposition. The combination of whole sediment pyrolysis and GC × GC-ToFMS is promising, but the procedure requires careful selection of its multiple anal. variables, particularly the pyrolysis temperature and the operational features of the GC columns. In the experiment, the researchers used many compounds, for example, 3-Ethylthiophene (cas: 1795-01-3Quality Control of 3-Ethylthiophene).
3-Ethylthiophene (cas: 1795-01-3) belongs to benzothiophene derivatives. Benzothiophene finds use in research as a starting material for the synthesis of larger, usually bioactive structures. Due to its aromaticity, thiophenes do not exhibit the same properties as conventional thioethers.Quality Control of 3-Ethylthiophene
Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem