| Title: | Impurity contribution to ultraviolet absorption of saturated fatty acids |
| Author(s): | Saito S; Numadate N; Teraoka H; Enami S; Kobayashi H; Hama T; |
| Address: | "Komaba Institute for Science and Department of Basic Science, The University of Tokyo, Meguro, Tokyo 153-8902, Japan. Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan" |
| ISSN/ISBN: | 2375-2548 (Electronic) 2375-2548 (Linking) |
| Abstract: | "Saturated fatty acids are abundant organic compounds in oceans and sea sprays. Their photochemical reactions induced by solar radiation have recently been found as an abiotic source of volatile organic compounds, which serve as precursors of secondary organic aerosols. However, photoabsorption of wavelengths longer than 250 nanometers in liquid saturated fatty acids remains unexplained, despite being first reported in 1931. Here, we demonstrate that the previously reported absorption of wavelengths longer than 250 nanometers by liquid nonanoic acid [CH(3)(CH(2))(7)COOH)] originates from traces of impurities (0.1% at most) intrinsically contained in nonanoic acid reagents. Absorption cross sections of nonanoic acid newly obtained here indicate that the upper limit of its photolysis rate is three to five orders of magnitude smaller than those for atmospherically relevant carbonyl compounds" |
| Notes: | "PubMed-not-MEDLINESaito, Shota Numadate, Naoki Teraoka, Hidemasa Enami, Shinichi Kobayashi, Hirokazu Hama, Tetsuya eng 2023/09/20 Sci Adv. 2023 Sep 22; 9(38):eadj6438. doi: 10.1126/sciadv.adj6438. Epub 2023 Sep 20" |
