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      General methods used during the Castelporziano campaigns

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      Atmospheric Environment
      Elsevier BV

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          Ambient levels of formaldehyde, acetaldehyde and formic acid in southern California: results of a one-year baseline study

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            Decomposition of Terpenes by Ozone during Sampling on Tenax.

            The ozonolytic decomposition of terpenes and terpenoids during sampling on Tenax is investigated in an artificial air system at ambient concentration levels. The detrimental effect of 8-150 ppbv ozone depends on the chemical structure of the compounds:  saturated terpenoids such as 1,8-cineole, camphor, and bornyl acetate are unaffected by ozone. The terpenes and terpenoids which containing one C-C double bond are slightly decomposed in the order camphene < β-pinene ≈ myrtenal < α-pinene < sabinene ≈ citronellal. The compounds containing two or more double bonds are significantly decomposed in the order d-limonene ≈ citral < linalool < β-ocimene < terpinolene < α-terpinene ≈ β-caryophyllene. For α-pinene, sabinene and d-limonene, their ozonolysis products are found on the tubes:  pinonaldehyde, 5-(1-methylethyl)bicyclo[3.1.0]hexan-2-one, and 3-(1-methylethenyl)-6-oxoheptanal. The analytical recoveries are significantly enhanced for many compounds when the sampling duration is reduced from 10 min to 30 s, explained by the time available for ozonolysis. A miniature ozone scrubber with multiple layers of MnO(2)-coated copper nets was developed and thoroughly tested. The optimal number of plies is found to be 8, which ensures quantitative recoveries for all test compounds except α-terpinene, β-caryophyllene, citral, and citronellal. The results that are reported here call into question previous data on terpenes and terpenoids and/or their oxidation products where measurements have been carried out without the prior removal of ozone.
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              Measurement of sub-parts-per-billion levels of carbonyl compounds in marine air by a simple cartridge trapping procedure followed by liquid chromatography

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                Author and article information

                Journal
                Atmospheric Environment
                Atmospheric Environment
                Elsevier BV
                13522310
                January 1997
                January 1997
                : 31
                :
                : 27-34
                Article
                10.1016/S1352-2310(97)00071-X
                b435ce99-fa8b-4b14-aa90-174fdef45559
                © 1997

                http://www.elsevier.com/tdm/userlicense/1.0/

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