Aquatic river humus

Figure 1. 1R spectra of i, aquatic river humus 2, chlorinated aquatic river humus 3, organic compounds from drinking water... 

Spectral Studies. UV ABSORPTION. The acetone fractions derived from drinking water exhibited intense UV absorption between 208 and 214 nm this behavior may be attributed to unsaturated acids or esters. The CFH samples presented maximum absorption at 254-256 nm, whereas an aquatic humus sample derived from the Satilla River showed a maximum absorption at 234 nm. Therefore, apparent differences in UV spectra among all sample groups were found. 

IR SPECTRA. The IR spectra of all 10 samples derived from drinking water are almost identical. Figure 1 shows a representative spectrum. For comparison, the IR spectra of Satilla River aquatic humus and CFH are added. All samples exhibited broad bands in the 3400-cm 1 (—OH), 1720-cm"1 (C=0), and 1640-cm 1 (C=C) regions. However, the spectra from the 10 drinking water samples and CFH samples showed distinct differences from that of the Satilla River aquatic humus, which absorbs sharply near 1600 cm-1. This result suggests that the samples derived from drinking water are strongly altered by chlorination and/or oxidation. Further confirmation of the spectral dissimilarities should be pursued by analysis of chlorinated alteration products of humus. 

C.R. Lytle and E.M. Perdue, Free, proteinaceous, and humic-bound amino acids in river water containing high concentrations of aquatic humus, Environ. Sci. Tech. 15 (1981) 224-228. 

Photolysis first-order rate constants for photosensitized reactions in water with various humic substances as sensitizers k = 0.17 h-1 with aquatic humus from Aucilla River, k = 0.12 Ir1 with Aldrich humic acid, k = 0.091 Ir1 with Fluka humic acid and k = 0.11 Ir1 with Contech fulvic acid in sunlight, corresponding to half-lives of 4 to 8 h (Zepp et al. 1981) photolysis t,/2 = > 50 yr at 15°C and a pH 5-9 (Torang et al. 2002). Oxidation rate constant k for gas-phase second order rate constants, koH for reaction with OH radical, kN03 with N03 radical and kQ3 with 03 or as indicated, data at other temperatures and/or the Arrhenius expression see reference ... 

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