07 Feb 2022
07 Feb 2022
Status: a revised version of this preprint is currently under review for the journal AMT.

Measurement of Enantiomer Ratios for Five Monoterpenes From Six Conifer Species by Cartridge Tube-Based Passive Sampling Adsorption/Thermal Desorption (ps-ATD)

Ying Wang1,2, Wentai Luo2, Todd N. Rosenstiel3, and James F. Pankow2 Ying Wang et al.
  • 1Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, 5088 Xincheng Street -Jingyue Economic Development District, Changchun 130118, China
  • 2Department of Civil and Environmental Engineering Portland State University, Portland, OR, 97207, United States
  • 3Department of Biology, Portland State University, Portland, OR, 97207, United States

Abstract. Many monoterpenes have at least two different stereochemical forms, and many biosynthetic pathways have long been known to favor one product over the other(s). A rapid method was developed and used in the determination of the (−/+) enantiomeric distributions for α-pinene, β-pinene, camphene, limonene, and β-phellandrene as emitted by plant material from six conifer species. The six species included two pine species Pseudotsuga menziesii and Pinus ponderosa, and four cypress species, Chamaecyparis lawsoniana, Thuja plilcata, Juniperus chinensis, and Thuja occidentalis.) The method involved passive sampling adsorption/thermal desorption (ps-ATD). During sampling, the cartridge tube was placed in a 60 mL glass vial with plant material for 1 h. Sample analytes were thermally transferred to a chiral gas chromatography (GC) column. Detection was by mass spectrometry (MS). The six species exhibited different emission patterns for the five monoterpenes in the −/+ totals, although within a given species the distributions among the five monoterpenes were similar across multiple plants. β-pinene dominated in P. menziesii and P. ponderosa, and α-pinene dominated in T. plicata and T. occidentalis. The chiral separations revealed differences in the −/+ enantiomeric distributions among the species. The (−) enantiomers of α-pinene and β-pinene dominated strongly in P. menziesii and P. ponderosa; the (−) enantiomer of β-phellandrene dominated in C. lawsoniana. The method precision was excellent.

Ying Wang et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-439', Anonymous Referee #1, 23 Mar 2022
    • AC1: 'Reply on RC1', Jim Pankow, 23 Mar 2022
  • RC2: 'Comment on amt-2021-439', Anonymous Referee #2, 12 Apr 2022
    • AC2: 'Reply on RC2', Jim Pankow, 01 Jun 2022

Ying Wang et al.

Ying Wang et al.


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Short summary
A rapid, sensitive, and precise analytical method was developed for measuring the fractional amounts of the (−) and (+) forms of chiral enantiomeric forms of monoterpenes in air containing biogenic plant emissions. The method uses passive air sampling onto adsorption/thermal desorption (ATD) gas sampling cartridge tubes followed by automatable thermal desorption onto a chiral gas chromatography (GC) column, followed by detection with mass spectrometry (MS).