Photo-solid-phase microextraction of selected indoor air pollutants from office buildings. Identification of their photolysis intermediates.
Photo-solid-phase microextraction (photo-SPME) has been employed to study the photolysis of three common indoor air pollutants: coumarin, butylated hydroxytoluene, 2,6-diisopropylnaphthalene. Analytes were first extracted by SPME, and the fibre was subsequently exposed to an irradiation source (i.e. xenon arc or low-pressure mercury lamp) for the selected time (from 2 to 120 min). Analyses of the irradiated fibres were carried out by gas chromatography-mass spectrometry (GC-MS) detection. Photodecay kinetics exhibited a first-order behaviour and their rate constants and half-life times were estimated. Twenty-five photoproducts have been tentatively identified by means of their mass spectra. On the basis of the identified transformation compounds, some photodegradation pathways were proposed. The photoformation-photodecay kinetics of the identified by-products were also monitored by photo-SPME. To the best of our knowledge, photolytic routes for coumarin, butylated hydroxytoluene and 2,6-diisopropylnaphthalene have not been previously investigated.
Fernandez-Alvarez
Maria
M
Departamento de Quimica Analitica, Nutricion y Bromatologia, Instituto de Investigacion y Analisis Alimentarios, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
Lores
Marta
M
Jover
Eric
E
Garcia-Jares
Carmen
C
Bayona
Josep M
JM
Llompart
Maria
M
D000393:Air Pollutants / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000032:analysis*; D002084:Butylated Hydroxytoluene / Q000032:analysis / Q000737:chemistry; D003374:Coumarins / Q000032:analysis / Q000737:chemistry; D007700:Kinetics; D008027:Light; D013058:Mass Spectrometry; D009281:Naphthalenes / Q000032:analysis / Q000737:chemistry; D010782:Photolysis; D052617:Solid Phase Microextraction / Q000379:methods*; D013997:Time Factors
D000393:Air Pollutants; D003374:Coumarins; D009281:Naphthalenes; D002084:Butylated Hydroxytoluene; C018520:2,6-diisopropylnaphthalene; C030123:coumarin