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Title: | Determination of Hydroxyl Radical in Seto Inland Sea and its Potential to Degrade Irgarol |
Authors: | Olasehinde, Emmanuel F. Ogunsuyi, H. O. Sakugawa, H. |
Keywords: | Hydroxyl radical irgarol photochemistry rate constant seawater |
Issue Date: | Jul-2012 |
Publisher: | IOSR |
Citation: | Olasehinde, E. F., Ogunsuyi, H. O., & Sakugawa, H. (2012). Determination of hydroxyl radical in Seto Inland Sea and its potential to degrade Irgarol. IOSR Journal of Applied Chemistry, 1, 7-14. |
Abstract: | Photo-production rates and overall scavenging rate constants of the highly reactive hydroxyl radicals (•OH) were measured by irradiation of surface seawater samples collected from the Seto Inland Sea, Japan. Photo-production rates of •OH ranged from 7.2 × 10-12 M s-1 to 424 × 1012 M s-1 and scavenging rate constants were 1.3 – 4.1×106 s -1 . The steady state concentrations of •OH in seawater, which were calculated from the photo-production rates and scavenging rate constants were in the range 2.6 –189 × 10-18 M. Estimation from the scavenging rate constant showed that the lifetime of •OH in seawater ranged from 0.29 ×10-6 s to 0.55 ×10-6 s. Nitrates and hydrogen peroxide contributions to OH radical formation rates were negligible in the samples studied. However, direct photolysis of NO2 - accounted for up to 73% of the observed •OH formation rates. The rate constant for the reaction •OH with irgarol was found to be (9.7 ± 0.52) × 109 M - 1 s -1. Based on the steady state concentration of •OH, the calculated half-lives for Irgarol due to the reaction with hydroxyl radicals in the Seto Inland Sea were in the range 4.3-318 days |
URI: | http://repository.elizadeuniversity.edu.ng/jspui/handle/20.500.12398/161 |
ISSN: | 2278-5736 |
Appears in Collections: | Research Articles |
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Determination_of_Hydroxyl_Radical_in_Seto_Inland_S.pdf | Article full-text | 619.81 kB | Adobe PDF | View/Open |
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