Simultaneous quantification of dissolved organic carbon fractions and copper complexation using solid-phase extraction

McElmurry, Shawn P.; Long, David T.; Voice, Thomas C.

doi:10.1016/j.apgeochem.2010.01.018

Cited by 13 publications

(9 citation statements)

References 39 publications

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“…The amount of organic carbon retained by hydrophobic (i.e., hydrophobicity) and hydrogen bonding interactions was determined by solid phase extraction (SPE). 35 Fractions isolated by this method relate to DOM structure. Conductivity, pH, and dissolved oxygen (DO) concentrations were measured using a Horiba U-10 multiprobe water quality analyzer.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Stormwater Dissolved Organic Matter: Influence of Land Cover and Environmental Factors

McElmurry

Long

Voice

2013

Environ. Sci. Technol.

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Dissolved organic matter (DOM) plays a major role in defining biological systems and it influences the fate and transport of many pollutants. Despite the importance of DOM, understanding of how environmental and anthropogenic factors influence its composition and characteristics is limited. This study focuses on DOM exported as stormwater from suburban and urban sources. Runoff was collected before entering surface waters and DOM was characterized using specific ultraviolet absorbance at 280 nm (a proxy for aromaticity), molecular weight, polydispersity and the fraction of DOM removed from solution via hydrophobic and H-bonding mechanisms. General linear models (GLMs) incorporating land cover, precipitation, solar radiation and selected aqueous chemical measurements explained variations in DOM properties. Results show (1) molecular characteristics of DOM differ as a function of land cover, (2) DOM produced by forested land is significantly different from other landscapes, particularly urban and suburban areas, and (3) DOM from land cover that contains paved surfaces and sewers is more hydrophobic than from other types of land cover. GLMs incorporating environmental factors and land cover accounted for up to 86% of the variability observed in DOM characteristics. Significant variables (p < 0.05) included solar radiation, water temperature and water conductivity.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Stormwater Dissolved Organic Matter: Influence of Land Cover and Environmental Factors

McElmurry

Long

Voice

2013

Environ. Sci. Technol.

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“…The same authors reported that when the concentration is sufficiently high to occupy most of the functional groups, the ions are heterogeneously retained over the whole surface of the humic particles. In a recent work [18], copper was found to bind preferentially with high molecular weight fractions of dissolved organic matter. This result corresponds with our previous results showing on copper binding with aromatic structures and other binding sites that cannot lose hydrogen ions and only part of the metal ions bonds to the humic acids through carboxylic or phenolic groups [19].…”

Section: Resultsmentioning

confidence: 94%

Complexation of Copper(II) with Humic Acids Studied by Ultrasound Spectrometry

Klučáková

2012

Organic Chemistry International

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Copper biogeochemistry is controlled by bonding to natural organic matter. The soluble forms of bonded copper can be more biologically active due to the higher migration in environmental systems and instability of some copper-humic complexes. In this work, the interactions of copper(II) ions with humic acids are studied by means of high-resolution ultrasound spectrometry. It was found that the stoichiometry of the formed complexes is strongly influenced by the organization of humic acid in solution and by the final pH value in equilibrium. Although the ratio between the added copper and humic acids in all used concentrations was constant and the initial pH value was neutral, we observed significant differences between the individual systems. The highest binding ability was determined for a humic content of 0.5 g·dm−3. More diluted and more concentrated systems were able to bind lower amounts of copper. The implemented method is very sensitive and can be utilized not only for monitoring copper binding but also as an indicator of conformational changes of humic acid in solutions with varying concentration.

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“…Next, we further verified that the experimental data accurately described Cu(II) complexation via PHREEQCi. Previously, we utilized this model to calculate free Pb and Cu(II) levels in our test solutions. ,, Based on reported K values and our empirical fit using eq , here we utilize PHREEQCi to predict Cu binding after addition of the five ligands.…”

Section: Resultsmentioning

confidence: 99%

“…Previously, we utilized this model to calculate free Pb and Cu(II) levels in our test solutions. 19,20,27 Based on reported K values and our empirical fit using eq 1, here we utilize PHREEQCi to predict after addition of the five ligands.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Voltammetric Characterization of Cu(II) Complexation in Real-Time

et al. 2016

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Aqueous metal behavior is strongly regulated by speciation, which in turn is highly dependent on complexation. Trace metal complexation is difficult to characterize in dynamically changing systems due to a lack of analytical methods that can rapidly report free-metal concentrations. In this paper, we perform proof-of-principle experiments that demonstrate the utility of fast-scan cyclic voltammetry (FSCV) for providing speciation information in real-time by characterizing dynamic Cu(II) binding. We study Cu(II) FSCV responses in 3-(N-morpholino)propanesulfonic acid (MOPS) buffer and characterize the hydrodynamic aspects of our experimental setup (continuously stirred tank reactor). We observe Cu(II) complexation in real-time using five ligands with differing formation constants of Cu(II) complexation. Finally, we utilize geochemical models to fit our real-time experimental Cu(II)-binding curves. Our proof-of-principle experiments show that FSCV is a powerful tool for studying real-time Cu(II) complexation, which is essential speciation information for better interpretation of Cu(II) behavior in dynamically changing systems, such as those encountered in biology or the environment.

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Simultaneous quantification of dissolved organic carbon fractions and copper complexation using solid-phase extraction

Cited by 13 publications

References 39 publications

Stormwater Dissolved Organic Matter: Influence of Land Cover and Environmental Factors

Stormwater Dissolved Organic Matter: Influence of Land Cover and Environmental Factors

Complexation of Copper(II) with Humic Acids Studied by Ultrasound Spectrometry

Voltammetric Characterization of Cu(II) Complexation in Real-Time

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