Study of copper(II) association with dissolved organic matter in surface waters of three Mexican coastal lagoons

Abstract

We have developed a unified aspiration efficiency model for sampling with round inlets at 0-90°forward angles from horizontal aerosol flows. The aspiration efficiency is represented by a single equation as a function of the sampling angle, the ratio of wind to inlet velocity, and different inertial parameters for 0-60°and 45-90°sampling. The equation for 45-90°s ampling is an extension of the Laktionov equation for 90°. The new model fits the experimental data within experimental accuracy.

Effects of calcium on the chromophores of dissolved organic matter and their interactions with copper

“…3 and 5e7 demonstrates that at pH 6.0 the number of protons released as a result of binding of Cu 2þ and Ca 2þ was close to 0.8 and 0.4, respectively. These values are comparable with those presented in prior research (Hansen et al, 1990;Lu and Allen, 2002).…”

Suspended particulate oxides and organic matter interactions in trace metal sorption reactions in a small urban river

“…The results suggest that there are two mechanisms occuring in the sorption of Cu to oxides and organic binding sites: 1. competition between distinct oxides and organic matter binding sites with Fe oxides sites more effectively scavenging Cu; and 2. some oxides -organic matter complex formation which increases the sorptive capacity of the oxide for Cu. The results from this study on the Don, highlight the observations made by other authors that the binding intensity for the same solid depends on the cation involved e.g., strong binding sites for one metal are not necessarily preferred binding sites for other metal ions; and that different binding energy sequences are expected for the same cations with respect to different geochemical fractions (Hansen et al 1990;Inskeep 8z Baham 1983;Benjamin & Leckie 1981;Vuceta & Morgan 1978 ability of oxides to scavenge trace metals despite being a small fraction of the overall mass of the solid pool is well documented (Tessier et al 1989;Farley et al 1985;Forstner & Wittmann 1981). Don River SPOM is probably more labile in nature due to treated sewage effluent entering the system, than nonanthropogenically influenced systems where refractory organic matter e.g., humic substances (HS) can be significant scavengers of trace metals (Tipping & Hurley 1992;Weber 1988;Fish et al 1986;Perdue & Lytle 1983).…”

The Role of the Humic Substances in the Fractioning of Heavy Metals in Rodrigo de Freitas Lagoon, Rio de Janeiro - Brazil

“…The affinity of organic matter for some metals, especially Cu and Pb, and to a lesser extent Ni, in anoxic environments has also been shown (Hansen et al 1990, Warren and Zimmerman 1994, Logan et al 1997, Lin and Wang 1998, Tipping et al 1998, Gao et al 1999, Taka´cs et al 1999. Ni concentrations of anthropic origin alternated between oxidant and reducing phases.…”