title: Real-time quantification of traces of biogenic volatile selenium compounds in humid air by selected ion flow tube mass spectrometry.
abstract: Biological volatilization of selenium, Se, in a contaminated area is an economical and environmentally friendly approach to phytoremediation techniques, but analytical methods for monitoring and studying volatile compounds released in the process of phytovolatilization are currently limited in their performance. Thus, a new method for real time quantification of trace amounts of the vapors of hydrogen selenide (H(2)Se), methylselenol (CH(3)SeH), dimethylselenide ((CH(3))(2)Se), and dimethyldiselenide ((CH(3))(2)Se(2)) present in ambient air adjacent to living plants has been developed. This involves the characterization of the mechanism and kinetics of the reaction of H(3)O(+), NO(+), and O(2)(+•) reagent ions with molecules of these compounds and then use of the rate constants so obtained to determine their absolute concentrations in air by selected ion flow tube mass spectrometry, SIFT-MS. The results of experiments demonstrating this method on emissions from maize (Zea mays) seedlings cultivated in Se rich medium are also presented.
authors.affiliation: J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 18223 Prague 8, Czech Republic.
authors.forename: Kristýna
authors.initials: K
authors.lastname: Sovová
authors.forename: Violetta
authors.initials: V
authors.lastname: Shestivska
authors.forename: Patrik
authors.initials: P
authors.lastname: Španěl
mesh_terms: D000388:Air; D006813:Humidity; D007477:Ions; D007700:Kinetics; D013058:Mass Spectrometry; D000432:Methanol / Q000031:analogs & derivatives* / Q000032:analysis / Q000378:metabolism; D009569:Nitric Oxide / Q000737:chemistry*; D016566:Organoselenium Compounds / Q000032:analysis* / Q000378:metabolism; D036226:Seedlings / Q000378:metabolism; D018036:Selenium Compounds / Q000032:analysis* / Q000378:metabolism; D013481:Superoxides / Q000737:chemistry*; D013997:Time Factors; D014835:Volatilization; D003313:Zea mays / Q000378:metabolism
chemical_list: D007477:Ions; D016566:Organoselenium Compounds; D018036:Selenium Compounds; D013481:Superoxides; D009569:Nitric Oxide; C019003:methaneselenol; C037445:dimethyldiselenide; C026372:hydrogen selenide; D000432:Methanol; C013503:dimethylselenide