Publication Date:
2024-04-20
Description:
Measurements of volatile organic compounds composition were captured using thermal desorption tubes from a Teflon enclosure. Measurements were taken at Cataract Scout Park, Appin, N.S.W. (34°14'42.29S 150°49'24.97E) as part of the Characterizing Organics and Aerosol Loading over Australia (COALA-2020) campaign. Enclosures captured branches of select local tree/shrub species.
Branch level VOC samples were made using a custom built, 9L branch enclosure. The two ends of the chamber were made from polytetrafluoroethylene (PTFE) supporting a transparent enclosure made from polyvinyl fluoride film (Dupont Chemicals, Macquarie Park, NSW, Australia). Ambient air, passed through an activated charcoal scrubber, was supplied to the chamber at 12 L min-1 using a mass flow controller (Aalborg, Orangeburg, NY, USA). Temperatures inside and outside the chamber were recorded manually every 5 minutes using a Digitech thermocouple thermometer with type K thermocouples (Jaycar Electronics, Rydalmere, NSW, Australia). Photosynthetically active radiation (PAR; µmol m-2 s-1) was recorded at the top of the chamber manually every 5 minutes using an Asensetek Lighting Passport; Asensetek, Taipei, Taiwan). VOCs were collected from the enclosures using a sorbent tube containing Tenax TA (Markes International Ltd, Llantrisant, U.K) connected to an air pump (AirChek 2000; SKC Inc., Eighty-Four, PA, USA) flowing air at 200mL min-1 for 30 minutes.
Branches were allowed 30 minutes to acclimate to conditions within the enclosure before VOC sampling commenced. Background (control) enclosure samples were taken at the beginning and end of each day. Post-sampling, tubes were maintained at 4°C until analysis by GC-MS. Sampling occurred over a two-week period in January 2020 and again in March 2020. Sorbent tubes were analysed by thermal desorption GC-MS using the same equipment and protocols described in Lawson et al. (2020; doi:10.3389/fmars.2020.00106). GC-MS data was then post-processed as described in Lawson et al. (2020) except contaminants were subtracted using mean plus 95% confidence values. Peaks were identified by manually comparing mass spectra against a commercial library (NIST08 library in NIST MS Search v.2.2f; NIST, Gaithersburg, MD, United States) using a match factor of 700. When peaks could not be identified, these were labelled using the format UNK with the number that follows being the retention time of the compound. Values for the peaks are expressed as percentages of the total quantifiable peak area (%TQPA).
Keywords:
(2E)-2-Decen-1-ol peak of the total quantifiable peak area; (3E)-2,5,5-Trimethyl-1,3,6-heptatriene peak of the total quantifiable peak area; (E)-2-Hexenal peak of the total quantifiable peak area; (Z)-3-Octene peak of the total quantifiable peak area; 1,1-Dimethyl-3-methylene-2-vinylcyclohexane peak of the total quantifiable peak area; 1,3-Hexadien-5-yne peak of the total quantifiable peak area; 1,5,5-Trimethyl-6-methylene-1-cyclohexene peak of the total quantifiable peak area; 1,8-Cineole peak of the total quantifiable peak area; 1-Heptene peak of the total quantifiable peak area; 1-Heptyl-2-methylcyclopropane peak of the total quantifiable peak area; 1-Hexanol peak of the total quantifiable peak area; 1-Methyl-4-isopropenylcyclohexan-3-ol peak of the total quantifiable peak area; 1-Octene peak of the total quantifiable peak area; 2,2,4-Trimethyl-4-pentene peak of the total quantifiable peak area; 2,2-Dimethylpropanoic acid peak of the total quantifiable peak area; 2,3-Dimethyl-2-hexene peak of the total quantifiable peak area; 2,4-Dimethyl-3-pentanone peak of the total quantifiable peak area; 2,4-Dimethylhexane peak of the total quantifiable peak area; 2,6,10-Trimethyldodecane peak of the total quantifiable peak area; 2,7-Dimethyl-3,5-octanedione peak of the total quantifiable peak area; 2-Butanone peak of the total quantifiable peak area; 2-Butyl-1-octanol peak of the total quantifiable peak area; 2-Ethyl-1-hexanol peak of the total quantifiable peak area; 2-Ethyl-1-hexene peak of the total quantifiable peak area; 2-Ethylhexanal peak of the total quantifiable peak area; 2-Hexanone peak of the total quantifiable peak area; 2-Isopropenyl-5-methyl-4-hexenal peak of the total quantifiable peak area; 2-Methyl-1,3-butadiene peak of the total quantifiable peak area; 2-Methyl-5-Hexanone peak of the total quantifiable peak area; 2-Methylpropan-1-ol peak of the total quantifiable peak area; 2-Methylpropanal peak of the total quantifiable peak area; 2-Octene peak of the total quantifiable peak area; 2-Pentanone peak of the total quantifiable peak area; 2-Tridecanone peak of the total quantifiable peak area; 3,3,5-Trimethylcyclohexanol peak of the total quantifiable peak area; 3,4,4-Trimethyl-2-pentene peak of the total quantifiable peak area; 3,5,5-Trimethyl-1-cyclohexene peak of the total quantifiable peak area; 3,6-Dimethyl-tetrahydropyran-2-one peak of the total quantifiable peak area; 3,7-Dimethyl-1,2,6-octadienal peak of the total quantifiable peak area; 3,7-Dimethyl-6-octenal peak of the total quantifiable peak area; 3-Hexen-1-ol peak of the total quantifiable peak area; 3-Hexen-2-one peak of the total quantifiable peak area; 3-Hexenal peak of the total quantifiable peak area; 3-Methyl-1-butanol peak of the total quantifiable peak area; 3-Methylbutanoic acid peak of the total quantifiable peak area; 3-Methylpentanal peak of the total quantifiable peak area; 3-Methylpentanoic acid peak of the total quantifiable peak area; 3-Pentanone peak of the total quantifiable peak area; 4,8,8-Trimethyl-2-methylene-4-vinylbicyclo[5.2.0]nonane peak of the total quantifiable peak area; 4-Methyldecane peak of the total quantifiable peak area; 6-Methyl-1-octene peak of the total quantifiable peak area; 6-Methyl-5-hepten-2-one peak of the total quantifiable peak area; a,a,4-Trimethyl-3-Cyclohexene-1-methanol peak of the total quantifiable peak area; Acetic acid peak of the total quantifiable peak area; Acetone peak of the total quantifiable peak area; Acetophenone peak of the total quantifiable peak area; alpha-Farnesene peak of the total quantifiable peak area; alpha-Pinene peak of the total quantifiable peak area; Appin, Australia; Australia; b-Caryophyllene peak of the total quantifiable peak area; Benzaldehyde peak of the total quantifiable peak area; Benzoic acid peak of the total quantifiable peak area; Benzothiazole peak of the total quantifiable peak area; beta-Ocimene peak of the total quantifiable peak area; beta-Pinene peak of the total quantifiable peak area; Biogenic VOC; Cataract_scout_park_Backhousia_citriodora_1; Cataract_scout_park_Backhousia_citriodora_2; Cataract_scout_park_Backhousia_citriodora_3; Cataract_scout_park_Banksia_serrata_1; Cataract_scout_park_Banksia_serrata_2; Cataract_scout_park_Banksia_serrata_3; Cataract_scout_park_Corymbia_gummifera_1; Cataract_scout_park_Corymbia_gummifera_2; Cataract_scout_park_Corymbia_gummifera_3; Cataract_scout_park_Eucalyptus_haemastoma_1; Cataract_scout_park_Eucalyptus_haemastoma_2; Cataract_scout_park_Eucalyptus_haemastoma_3; Cataract_scout_park_Eucalyptus_sieberi_1; Cataract_scout_park_Eucalyptus_sieberi_2; Cataract_scout_park_Eucalyptus_sieberi_3; Cataract_scout_park_Melaleuca_quinquenervia_1; Cataract_scout_park_Melaleuca_quinquenervia_2; Cataract_scout_park_Melaleuca_quinquenervia_3; Cedrene peak of the total quantifiable peak area; Characterizing Organics and Aerosol Loading over Australia; cis-3-Hexenyl-1-Acetate peak of the total quantifiable peak area; COALA; COALA-2020; Copaene peak of the total quantifiable peak area; CSP_Backhousia_citriodora_1; CSP_Backhousia_citriodora_2; CSP_Backhousia_citriodora_3; CSP_Banksia_serrata_1; CSP_Banksia_serrata_2; CSP_Banksia_serrata_3; CSP_Corymbia_gummifera_1; CSP_Corymbia_gummifera_2; CSP_Corymbia_gummifera_3; CSP_Eucalyptus_haemastoma_1; CSP_Eucalyptus_haemastoma_2; CSP_Eucalyptus_haemastoma_3; CSP_Eucalyptus_sieberi_1; CSP_Eucalyptus_sieberi_2; CSP_Eucalyptus_sieberi_3; CSP_Melaleuca_quinquenervia_1; CSP_Melaleuca_quinquenervia_2; CSP_Melaleuca_quinquenervia_3; DATE/TIME; Docosan-1-ol peak of the total quantifiable peak area; Emissions; Event label; Gas chromatography - Mass spectrometry (GC-MS); HAND; Heptanal peak of the total quantifiable peak area; Heptane peak of the total quantifiable peak area; LATITUDE; Limonene peak of the total quantifiable peak area; LONGITUDE; Methoxy-phenyl-oxime peak of the total quantifiable peak area; Methyl 3-methyl-2-pentenoate peak of the total quantifiable peak area; Methyl vinyl ketone peak of the total quantifiable peak area; Nonanal peak of the total quantifiable peak area; Nonanoic acid peak of the total quantifiable peak area; Octanal peak of the total quantifiable peak area; Octane peak of the total quantifiable peak area; Pentanoic acid, 3-methylbutyl ester peak of the total quantifiable peak area; Pentyl pentanoate peak of the total quantifiable peak area; Phenol peak of the total quantifiable peak area; Replicates; Sample comment; Sampling by hand; Species; thermal desorption; Toluene peak of the total quantifiable peak area; Volatile organic compound, unidentified peak of the total quantifiable peak area
Type:
Dataset
Format:
text/tab-separated-values, 9694 data points
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