Determination of Hydroxyl Radical in Seto Inland Sea and its Potential to Degrade Irgarol
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Date
2012-07
Journal Title
Journal ISSN
Volume Title
Publisher
IOSR
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
Description
Keywords
Hydroxyl radical, irgarol, photochemistry, rate constant, seawater
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.