Radiocarbon analysis of atmospheric formaldehyde using cystamine derivatization
Date of Original Version
A compound specific radiocarbon analysis method was developed to evaluate the 14C composition of atmospheric formaldehyde. In this method, gaseous formaldehyde was collected with a high-volume air sampler using glass-fiber filters pretreated with sodium bisulfite. Collected formaldehyde was then released into water and derivatized with cysteamine to thiazolidine. The thiazolidine was extracted into dichloromethane and concentrated by evaporation. Concentrated thiazolidine was separated from other compounds using preparative capillary gas chromatography and uniquely collected as a phosphate salt with a fraction collector. The 14C composition of the salt was analyzed by accelerator mass spectrometry after combustion to CO2 and subsequent reduction to graphite. In a pilot study, ambient formaldehyde samples collected on the roof of the CACS building at Narragansett Bay Campus, Narragansett, RI, showed a significantly larger fraction of fossil carbon than modern carbon. © 2009 American Chemical Society.
Publication Title, e.g., Journal
Shen, Haiwei, Ann P. McNichol, Li Xu, Alan Gagnon, and Brian G. Heikes. "Radiocarbon analysis of atmospheric formaldehyde using cystamine derivatization." Analytical Chemistry 81, 15 (2009). doi: 10.1021/ac9004666.