Reference

Fluorocarbons and other halocarbons in foods, drugs, animal drugs, biological products, cosmetics, and medical devices

Fluorocarbons and other halocarbons in foods, drugs, animal drugs, biological products, cosmetics, and medical devices. Anon. (Food Drug Adm., Washington, D. C., USA). Fed.In this article, certain chemicals are used. Some of their cas registry numbers are 76-14-2 and 76-15-3 Regist., 41(229), 52070-8, (English) 26 Nov 1976. CODEN: FEREAC. DOCUMENT TYPE: Journal CA Section: 17 (Foods) Section cross-reference(s): 62, 4, 63 The Food and Drug Administration proposes to phase out all nonessential uses of at least the fully halogenated chlorofluoroalkanes, such as chlorofluorocarbons 11 [75-69-4], 12 [75-71-8], 13 [75-72-9], 113 [76-13-1], 114 [76-14-2], and 115 [76-15-3], in foods, human and animal drugs, biol. products, cosmetics, and medical devices. These compds. may deplete stratospheric O3, leading to an increase in skin cancer, climatic changes, and other adverse effects. .

Photodecomposition of fluorocarbons in the air

Photodecomposition of fluorocarbons in the air. Kagiya, Tsutomu; Takemoto, Katsuo; Kawazoe, Wataru (Fac. Eng., Kyoto Univ., Kyoto, Japan). Nippon Kagaku Kaishi, (6), 935-40 (Japanese) 1976. CODEN: NKAKB8. DOCUMENT TYPE: Journal CA Section: 59 (Air Pollution and Industrial Hygiene) Section cross-reference(s): 23, 74 Air contg. a fluorocarbon (1000 ppm), e.g., CHClF2 [75-45-6], CClF3 [75-72-9], CCl2Fe2 [75-71-8] C2H4F2 [75-37-6], CBrClF2 [353-59-3], CBrF3 [75-63-8], C2H2F2 [75-38-7], C2ClF3 [79-38-9] and C2F4 [116-14-3], was irradiated by a Hg lamp at room temp. With CCl2F2 and C2ClF3 the photodecompn. in the presence of O was faster than that in the absence of O. Both CO and CO2 were obsd. in the irradiated gas. The initial degree of decompn. of fluorocarbons, chlorofluorocarbons, unsatd. fluorocarbons, and unsatd. chlorofluorocarbons increased with the decrease wavelength, and that of bromofluorocarbons with the increase in wavelength. The initial degree of decompn. 75-71-8 and 116-14-3 which are cas registry numbers are also used here. of C2ClF3 with UV irradn. by a high-pressure Hg lamp (100 W) was .apprx.1000 times that of CCl2F2 and .apprx.50 times that of CBrClF2. The photooxidative decompn. of C2ClF3 also took place by sunlight irradn., 60% disappearing under outdoor exposure within 3 days. In the case of CCl2F2, the reaction did not occur under outdoor exposure during 1 week. The reaction of C2ClF3 was accelerated by both Cl and O3, while those of CCl2F2 and CBrClF2 were not. On the other hand, CF4 [75-73-0] and C2H4F2 scarcely affected the decompn. of O3, while CBrClF2 and C2ClF3 remarkably accelerated that. In the case of CCl2F2, the initial degree of decompn. of O3 increased proportionally with the increase in the initial concn. of CCl2F2 (log[CCl2F2]). .