Suwannee River matter

Figure 3.4. Change in weight-average molecular weight of NOM samples from the Suwannee River (a) and Great Dismal Swamp (b) by goethite and kaolinite. The term eqm refers to the concentration after 24-h equilibration time. Reprinted from Meier, M., Namjesnik-Dejanovic, K., Maurice, P. A., Aiken, G. R., Chin, Y. P., and Cabaniss, S. (1999). Fractionation of aquatic natural organic matter upon sorption to goethite and kaolinite. Chem. Geol. 157, 275-284, with permission from Elsevier.

Serkiz, S. M., and Perdue, E. M. (1990). Isolation of dissolved organic matter from the Suwannee River using reverse osmosis. Water Res. 24, 911-916. 

Kanan, M.C., Kanan, S.M., Austin, R.N., Patterson, H.H. (2003) Photodecomposition of carbaryl in the presence of silver-doped zeolite Y and Suwannee River natural organic matter. Environ. Sic. Technol. 37, 2280-2285. 

Cabaniss S. E. and Shuman M. S. (1988a) Copper binding by dissolved organic matter I. Suwannee River fulvic acid equilibria. Geochim. Cosmochim. Acta 52, 185-193. 

Trichloroacetate rapidly reacts with the solvated electrons produced by laser flash photolysis of natural organic matter isolated from the Suwannee River, and thus quenches the absorption of the electrons at 720 nm. The ibsorption is also quenched by the addition of other good electron acceptors, including oxygen, protons, or nitrous oxide. In natural waters, halocarbon concentrations are typically very low, and the dominant scavenger of solvated electrons is oxygen. 

Figure 3. Effects of trichloroacetate (0.0050 M) on the absorption (720 nm) of solvated electrons produced by laser flash photolysis (355 nm) of argon-saturated solutions (pH 6.2) of natural organic matter isolated from the Suwannee River near Fargo, Georgia (12). A, no added trichloroacetate B, with added...

Photoreductions of Sorbed Halocarbons. Comparisons of computed rates of halocarbon photoreduction by eaq with observed rates in natural water samples indicate that other reaction pathways are more important. For example, recent results obtained with continuous irradiations indicate that chlorinated acetates produce chloride more efficiently than chloroethanol in solutions of dissolved organic matter that was isolated from the Suwannee River. Observed quantum yields (355 nm) for chloride production at pH 6.2 in aque-... 

The MinteqA2 database contains dissolved organic matter (DOM) as a component (number 145). The DOM was isolated from the Suwannee River by Serki2 and Perdue (1990) by reverse osmosis. It was not fractionated into humic and fulvic fractions and is thus not identical to the IHSS Suwannee River FA and HA used in this study. 

Chlorine p C/)(/= 3/2, 3/2). - The " Cs and NMR T, relaxation studies of the Cs" and Cl complexation by Suwannee River natural organic matter (NOM) provide significant, new insight into the interaction of these species with NOM. The Cl NMR chemical shift and Ti relaxation rates show that there is no significant complexation between Cl and NOM. The authors studied the efficacy of the tris-glycinatocobaltate(II) complex ([Co(gly)(3)] ) as a shift reagent (SR) for chloride by Cl NMR spectroscopy and compared to that of Co (aq.). ... 

Figure 4 (A) CZE-ESI-MS (negative ionization modus) intensity piot of Suwannee River NOW (ammonium carbonate, pH 10) (B) TIC in timescale (C) CZE-UV (254nm) electropherogram in effective mobility scale of Suwannee River NOM and superimposed electropherograms of selected FFE fractions (measured in CE immediately after FFE separation). (D) FFE-TOC of Suwannee river NOM in effective mobility scale with superimposed weighted (m/z) values as obtained from offline ESI-MS (positive ionization modus) of selected FFE fractions. (Adapted with permission from Schmitt-Kopplin P and Kettrup A (2003) Capillary electrophoresis-elect-rospray ionization-mass spectrometry for the characterization of natural organic matter an evaluation with free flow electrophoresis-off-line flow injection electrospray ionization-mass spectrometry. Electrophoresis 24 3057-3066 Wiley-VCH.)...

FIGURE 10.15 Acid-base titration curves of 14 humic substances, from IHSS standards Terrestrial FA samples are standard Elliot soil, standard Pahokee Peat and reference Pahokee Peat aquatic FA include standard Suwannee River, reference Suwannee River and reference Nordic Lake NOM is Suwannee River aquatic HA are standard Suwannee River and reference Nordic Lake and terrestrial HA include standard Elliot soil, standard Pahokee Peat standard Leonardite, reference Pahokee Peat and reference Summit Hill Soil (Reprinted frotri Geochimica et Cosmochimica Acta, 67, no. 1, Ritchie, J. D and Perdue, E Protonbindins study of standard and reference fulvic acids, humic acids, and natural organic matter 85-93 Copyright 2003, with permission from Elsevier.)... 

Figure 7-11 is a comparison of the pH-potentiometric titration behavior of three surface archetypes (Fig. 7-1 la) a colloidal metal oxide-hematite (oc-Fe203) (Fig. 7-1 lb) a natural organic matter (NOM) Suwannee River humic acid, and (Fig. 7-1 Ic) a Gram-negative bacteria (Desulfovibrio vulgaris). While there are many other examples that might be brought to bear as representative colloid types, the three colloids described here exhibit the range of characteristics of colloids that can be found in systems of environmental relevanee. These three surface types also will be discussed in the Colloid Generation, Transport and Deposition section.

Hefner, K.H., Fisher, J.M., and Ferry, J.L. (2(X)6). A multifactor exploration of the photo-bleaching of Suwannee River dissolved organic matter across the freshwatersaltwater interface. Environ. Sci. Technol., 40(12), 3717-3722. 

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