In-Situ Investigation of Interactions between Magnesium Ion and Natural Organic Matter

Yan, Mingquan; Lü, Yujuan; Gao, Yuan; Benedetti, Marc F.; Korshin, Gregory V.

doi:10.1021/acs.est.5b00003

Cited by 69 publications

(31 citation statements)

References 38 publications

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“…(Kalinichev and Kirkpatrick, 2007), suggest that, the strongly held hydration shell makes Mg 2þ interact little with NOM. This is however, contradicted by Yan et al (2015), who in studying Mg 2þ -NOM interaction using differential absorbance spectroscopy confirms the existence of strong interactions between Mg 2þ and NOM. This is however dependent on pH and the ability of Mg 2þ to deprotonate phenolic and carboxylic groups of NOM.…”

Section: S-block (Calcium Magnesium Sodium)mentioning

confidence: 87%

“…The carboxylic group, forms strong association with Mg 2þ compared to the phenolic group (Ahn et al, 2008). Even at higher pH, Mg 2þ shares similar properties to Ca 2þ and can still bond to the carboxylic groups and to a lesser extent to the phenolic groups of the NOM (Lu and Allen, 2002;Iglesias et al, 2003;Yan et al, 2015). This binding was accompanied by the replacement of protons in the protonation-active phenolic and carboxylic groups (Korshin et al, 2009).…”

Section: S-block (Calcium Magnesium Sodium)mentioning

confidence: 99%

“…Cu þ (pH < 7) þþ þþ n.a (Kinniburgh et al, 1999;Karlsson et al, 2006;Cabaniss, 2011) Fe þ þ þ þ n.a (Muñoz and von Sonntag, 2000;P edrot et al, 2011;Marsac et al, 2013). Mg þþ þ n.a n.a (Lu and Allen, 2002;Iglesias et al, 2003;Ahn et al, 2008;Korshin et al, 2009;Yan et al, 2015). Na þ n.a n.a n.a Iskrenova-Tchoukova et al (Cabaniss, 2009(Cabaniss, , 2011.…”

Section: Functional Groups Carboxylic Group Phenolic Amine Sulfur Refunclassified

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Natural organic matter-cations complexation and its impact on water treatment: A critical review

et al. 2019

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a b s t r a c tThe quality and quantity of natural organic matter (NOM) has been observed to evolve which poses challenges to water treatment facilities. Even though NOM may not be toxic itself, its presence in water has aesthetic effects, enhances biological growth in distribution networks, binds with pollutants and controls the bioavailability of trace metals. Even though NOM has heterogeneous functional groups, the predominant ones are the carboxyl and the phenolic groups, which have high affinities for metals depending on the pH. The properties of both the NOM and the trace elements influence the binding kinetics and preferences. Ca 2þ prefers to bind with the carboxylic groups especially at a low pH while Zn 2þ prefers the amine groups though practically, most cations bind to several functions groups. The nature of the chemical environment (neighboring ligands) the ligand finds itself equally influences its preference for a cation. The presence of NOM, cations or a complex of NOM-cations may have significant impact on the efficiency of water processes such as coagulation, adsorption, ion exchange resin and membrane filtration. In coagulation, the complexation between the coagulant salts and NOM helps to remove NOM from solution. This positive influence can further be enhanced by the addition of Ca 2þ . A negative influence is however, observed in lime-softening method as NOM complexes with Ca 2þ . A negative influence is also seen in membrane filtration where divalent cations partially neutralize the carboxyl functional groups of NOM thereby reducing the repulsion effect on NOM and increasing membrane fouling. The formation of disinfection by-products could either be increased or reduced during chlorination, the speciation of products formed is modified with generally the enhancement of haloacetic acid formation observed in presence of metal cations. This current work, presents in details the interactions of cations and NOM in the environment, the preference of cations for each functional group and the possible competition between cations for binding sites, as well as the possible impacts of the presence of cations, NOM, or their complex on water treatment processes.

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Section: S-block (Calcium Magnesium Sodium)mentioning

confidence: 87%

Section: S-block (Calcium Magnesium Sodium)mentioning

confidence: 99%

Section: Functional Groups Carboxylic Group Phenolic Amine Sulfur Refunclassified

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Natural organic matter-cations complexation and its impact on water treatment: A critical review

et al. 2019

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“…A differential UV-Vis spectrometry method (Yan et al, 2015) was used to probe possible interactions between metal ions and PFOA. To this end, a 2-mmole L -1 metal (Cu 2+ , Mg 2+ or Mn 2+ ) ion solution was mixed with a 2-mmole L -1 PFOA solution by different ratios ranging from 9:1 to 1:9 to make 10-mL mixture solutions.…”

Section: Differential Uv-vis Spectrometrymentioning

confidence: 99%

Factors controlling the rate of perfluorooctanoic acid degradation in laccase-mediator systems: The impact of metal ions

Luo

Wang

Feng

et al. 2017

Environmental Pollution

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This study investigated the factors that regulated the degradation of perfluorooctanoic acid (PFOA) in laccase-catalyzed oxidative humification reactions with 1hydroxybenzotriazole (HBT) as a mediator. The reaction rates were examined under conditions with key factors varied, including initial PFOA concentrations, laccase and HBT dosages, and the ionic contents of the reaction solutions. The PFOA degradation followed pseudo-first order kinetics, and the rate constants (k) were similar for the high (100 μmole L-1) and low (1.00 μmole L-1) initial PFOA concentrations, respectively at 0.0040 day-1 (r 2 = 0.98) and 0.0042 day-1 (r 2 = 0.86) under an optimum reaction condition tested in this study. The metal ions contained in the reaction solution appeared to have a strong impact on PFOA degradation. Differential UV-Vis spectrometry revealed that Cu 2+ can complex with PFOA, which plays an essential role to enable PFOA degradation, probably by bridging the negatively charged PFOA and laccase, so that the free radicals of HBT that are released from laccase can reach and react with PFOA. It was also found that Fe 3+ plays a similar role as Cu 2+ to enable PFOA degradation in the laccase-HBT reaction system. In contrast, Mg 2+ and Mn 2+ cannot complex with PFOA under the investigated conditions, and do not enable PFOA degradation in the laccase-HBT system. Fluoride and partially fluorinated compounds were detected as PFOA degradation products using ion chromatography and high resolution mass spectrometry. The structures of the products suggest the reaction pathways involving free-radical initiated decarboxylation, rearrangement, and cross-coupling. Capsule: The factors that regulate the degradation of perfluorooctanoic acid (PFOA) in laccase-catalyzed oxidative humification reactions are identified and elucidated.

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“…Besides SUVA 254 , the differential absorbance and slope of normal (or log-transformed) absorbance spectrum for Suwannee River DOM have been found to be correlated with concentrations of metals bound to DOM in the pH range from 5 to 11 (e.g., Cu, Fe, calcium [Ca] and magnesium [Mg]). These facts generally suggest that metal complexation by DOM is accompanied by the replacement of protons in carboxylic and phenolic functional groups, though the direct measurement using advanced techniques may be required to understand the detailed complexation mechanism (Gao et al, 2015;Yan and Korshin, 2014, Yan et al, 2013a, 2013b, 2013cYan et al 2015). However, previous studies were conducted using operationally isolated DOM, and concentrations of DOM and metals higher than those typically found in the natural environment, and therefore may not directly demonstrate the applicability of DOM optical parameters for predicting concentrations of dissolved trace metal complexes in environmental water systems exhibiting a range of water qualities.…”

Section: Introductionmentioning

confidence: 99%

Correlations between aromaticity of dissolved organic matter and trace metal concentrations in natural and effluent waters: A case study in the Sagami River Basin, Japan

Kikuchi

Fujii

Terao

et al. 2017

Science of The Total Environment

108

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Chemical speciation, reactivity, and bioavailability of trace metals in aqueous systems arestrongly influenced by dissolved organic matter (DOM). DOM is a mixture of diverse components, so a range of organic molecules potentially participates in the occurrence of dissolved trace metals. In this study, we investigated water quality variables that influence dissolved trace metal concentrations in natural and effluent water systems with a particular attention given to the relationship between DOM optical properties and dissolved copper and iron concentrations. We found that specific UV absorbance (SUVA: an indicator of DOM aromaticity) has a significant correlation with dissolved trace metal to dissolved organic carbon concentration ratios ([Me]/[DOC]) for copper and iron in natural freshwaters and treated municipal wastewater in the Sagami River basin, Japan. This trend was also prevalent for other freshwaters in temperate climates except for Fe-rich waters. Our findings indicate that the concentrations of dissolved copper and iron in natural and effluent waters are significantly influenced not only by DOM concentration, but also by aromaticity of DOM, and that this DOM property can be inferred from spectrophotometric measurements.

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In-Situ Investigation of Interactions between Magnesium Ion and Natural Organic Matter

Cited by 69 publications

References 38 publications

Natural organic matter-cations complexation and its impact on water treatment: A critical review

Natural organic matter-cations complexation and its impact on water treatment: A critical review

Factors controlling the rate of perfluorooctanoic acid degradation in laccase-mediator systems: The impact of metal ions

Correlations between aromaticity of dissolved organic matter and trace metal concentrations in natural and effluent waters: A case study in the Sagami River Basin, Japan

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