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KMID : 0385520030160060466
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Analytical Science & Technology
2003 Volume.16 No. 6 p.466 ~ p.474
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The photochemical reactions of iron species in rain and snow in Higashi-Hiroshima, Japan
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Kim DH
Takeda K/Sakugawa H/Lee JS
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Abstract
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This paper describes the concentrations of total dissolved iron (tFe) and Fec^(2+) in rainwater and snow, the relationship of Fe species with other metals and ions in bulk rainwater, and the Fe^(2+) generation mechanism in aqueous samples in rainwater of time series collection. Volume weight mean concentrations of tFe and Fe^(2+) were 3.22 and 1.25 ㎍L^(-1) in bulk rainwater, and 50.1 and 43.5 ㎍L^(-1) in snow, respectively. Fe^(2+) was significant fraction to the tFe, accounted for 3.25-93.4% of the tFe in rainwater and 87% in snow. We also investigated temporal variations of tFe, Fe^(2+), other metals and ions in rainwater of time series collection during rain event. Although the concentration range of tFe was different from those of other species, a decreasing trend of tFe from the beginning of the rain event was similar with other species. However, though Fe^(2+) did not show such a decreasing trend, Fe^(2+)/tFe was in good correlation with solar radiation. From the results of multiple linear regression analysis and thermodynamic calculations (Mineql+), Fe^(2+) in our samples may be generated from photochemical reduction of Fe^(3+) species (such as Fe(OH)^(2+), Fe(OH)^(2+) and Fe-oxalate) at daytime.
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