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The aqueous photolysis of ??-pinene in solution with humic acid

By:
, , ,
Edited by:
McCalady Donald L.

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Abstract

Terpenes are produced abundantly by environmental processes but are found in very low concentrations in natural waters. Aqueous photolysis of solutions containing ??-pinene, a representative terpene, in the presence of humic acid resulted in degradation of the pinene. Comparison of this reaction to photolysis of ??-pinene in the presence of methylene blue leads to the conclusion that the reactive pathway for the abiotic degradation of ??-pinene is due to reaction with singlet oxygen produced by irradiation of the humic material. The initial product of singlet oxygen and ??-pinene is a hydroperoxide. Since humic materials are prevalent in most natural waters, this mechanism of photodecomposition for ??-pinene probably also applies to other terpenes in surface waters and may be reasonably considered to contribute to their low environmental concentration.Terpenes are produced abundantly by environmental processes but are found in very low concentrations in natural waters. Aqueous photolysis of solutions containing ??-pinene, a representative terpene, in the presence of humic acid resulted in degradation of the pinene. Comparison of this reaction to photolysis of ??-pinene in the presence of methylene blue leads to the conclusion that the reactive pathway for the abiotic degradation of ??-pinene is due to reaction with singlet oxygen produced by irradiation of the humic material. The initial product of singlet oxygen and ??-pinene is a hydroperoxide. Since humic materials are prevalent in most natural waters, this mechanism of photodecomposition for ??-pinene probably also applies to other terpenes in surface waters and may be reasonably considered to contribute to their low environmental concentration.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
The aqueous photolysis of ??-pinene in solution with humic acid
Volume
9
Issue:
1-2
Year Published:
1992
Language:
English
First page:
79
Last page:
89
Number of Pages:
11
Conference Title:
Pacifichem '89
Conference Location:
Honolulu, HI, USA
Conference Date:
17 December 1989 through 22 December 1989