Rsc_cp_b924775k 1..11
نویسندگان
چکیده
In this paper, a kinetic study of the oxidation of maleic and fumaric acid organic particles by gas-phase ozone at relative humidities ranging from 90 to 93% is reported. A flow of single component aqueous particles with average size diameters in the range 2.6–2.9 mm were exposed to a known concentration of ozone for a controlled period of time in an aerosol flow tube in which products were monitored by infrared spectroscopy. The results obtained are consistent with a Langmuir–Hinshelwood type mechanism for the heterogeneous oxidation of maleic/fumaric acid aerosol particles by gas-phase ozone, for which the following parameters were found: for the reaction of maleic acid aerosols, KO3 = (9 4) 10 15 cm molecule 1 and kmax = (0.21 0.01) s ; for the reaction of fumaric acid aerosols, KO3 = (5 2) 10 15 cm molecule 1 and kmax = (0.19 0.01) s . From the pseudo-first-order coefficients, apparent uptake coefficient values were calculated for which a decreasing trend with increasing ozone concentrations was observed. Comparison with previous measurements of the same system under dry conditions reveals a direct effect of the presence of water on the mechanism of these reactions, in which the water is seen to increase the formation of CO2 and formic acid (HCO2H) through increased levels of hydroxyacetyl hydroperoxide intermediate.
منابع مشابه
Line 806 (06/25/17) -- Metro Rail - Downtown LA - Downtown Santa Monica
— — — 3:26A 3:29A 3:31A 3:35A 3:37A 3:39A 3:41A 3:42A 3:44A 3:48A 3:51A 3:53A 3:55A 3:58A 4:04A 4:06A — — — 3:47 3:50 3:52 3:56 3:58 4:00 4:02 4:03 4:05 4:09 4:12 4:14 4:16 4:19 4:25 4:27 — — — 3:59 4:02 4:04 4:08 4:10 4:12 4:14 4:15 4:17 4:21 4:24 4:26 4:28 4:31 4:37 4:39 — — — 4:11 4:14 4:16 4:20 4:22 4:24 4:26 4:27 4:29 4:33 4:36 4:38 4:40 4:43 4:49 4:51 — — — 4:26 4:29 4:31 4:35 4:37 4:39 4...
متن کاملLine 803 (12/11/16) -- Metro Rail - Metro Green Line - RailEastbound to Norwalk - Westbound to Redondo Beach
— — — — — — — — — — 3:36A 3:42A 3:58A 4:08A — 3:53A 3:55A 3:57A 3:59A 4:02A 4:05A 4:07A 4:09A 4:11A 4:13 4:16 4:21 4:25 — 4:21 4:23 4:25 4:27 4:30 4:33 4:35 4:37 4:39 4:41 4:44 4:49 4:53 4:31A 4:33 4:35 4:37 4:39 4:42 4:45 4:47 4:49 4:51 5:00 5:03 5:08 5:12 4:50 4:52 4:54 4:56 4:58 5:01 5:04 5:06 5:08 5:10 5:12 5:15 5:20 5:24 5:03 5:05 5:07 5:09 5:11 5:14 5:17 5:19 5:21 5:23 5:25 5:28 5:33 5:37...
متن کاملLine 804 (06/26/16) -- Metro Rail - Metro Gold Line (Azusa – Union Station – East LA)
4:20A 4:30A 4:34A 4:40A 4:44A 4:50A 4:56A 4:59A 5:04A 5:05A 5:09A 5:12A 5:17A 5:20A 5:24A 5:28A 5:32A 4:44 4:54 4:58 5:04 5:08 5:14 5:20 5:23 5:28 5:29 5:33 5:36 5:41 5:44 5:48 5:52 5:56 5:04 5:14 5:18 5:24 5:28 5:34 5:40 5:43 5:48 5:49 5:53 5:56 6:01 6:04 6:08 6:12 6:16 5:24 5:34 5:38 5:44 5:48 5:54 6:00 6:03 6:08 6:09 6:13 6:16 6:21 6:24 6:28 6:32 6:36 5:44 5:54 5:58 6:04 6:08 6:14 6:20 6:23 ...
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11 -Hydroxysteroid dehydrogenase type 1 (11 -HSD-1), a regulator of intrahepatocellular glucocorticoid activity, is bidirectional in homogenates but catalyses 11 reduction (regenerating glucocorticoid) in intact primary hepatocytes in culture. To examine this discrepancy at the whole-organ level, we examined 11 -HSD-1 activity in the intact bivascularly perfused rat liver. On a single pass thro...
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