Effects of NOM properties on copper release from model solid phases

Overlooked Role of Carbonyls of Natural Organic Matter on the Dissolution of Zinc Oxide Nanoparticles

“…These experiment results showed the same trends as the NOM experiments and enhanced the important role of aromatic ketone/aldehyde groups in these processes, as well as quinone moieties. In previous studies, ,,, the concentration of NOM was mostly between 2 and 10 mg C/L, and the common dissolved organic carbon concentration in river and underground water is between 2 and 10 mg/L. Therefore, the concentration of the NOM, ketone, and quinone solutions in this study was 5 mg C/L.…”

“…Simultaneously, NOM is widespread in nature and plays an important role in the dissolution and transformation of metal-bearing NPs in the environment. − The effect of NOM on the dissolution of metal-containing NPs is a complex process, depending on the mechanism by which NOM interacts with the particles . Studies have found that different NOMs have different effects on the stability of NPs, − and the dissolution of cinnabar and copper-containing minerals in the presence of NOM was also researched. , …”

“…25 Studies have found that different NOMs have different effects on the stability of NPs, 26−30 and the dissolution of cinnabar and copper-containing minerals in the presence of NOM was also researched. 31,32 Previous studies have found that NaBH 4 can selectively reduce the ketone/aldehyde groups in NOM to form alcohol without affecting other functional groups and also reduce quinones to hydroquinones. 33−41 Under anoxic conditions, Na 2 S 2 O 4 can only selectively reduce quinones to hydroquinones.…”

High Pressure Size Exclusion Chromatography (HPSEC) Determination of Dissolved Organic Matter Molecular Weight Revisited: Accounting for Changes in Stationary Phases, Analytical Standards, and Isolation Methods

“…Molecular weight and polydispersity are properties of dissolved organic matter (DOM) that play an important role in DOM’s structure, fate, and reactivity in a global range of environments. For instance, molecular weight has been correlated to the lability of marine and terrestrial organic matter − and, together with polydispersity, has been used to determine its sources and understand its fate in aqueous environments. − The photochemistry of DOM is impacted by molecular weight and polydispersity, both in terms of generating reactive species as well as quenching photoreactions. − In addition, molecular weight both influences and is influenced by the formation of metal–DOM complexes, − which impact the aggregation and dissolution of natural and engineered nanoparticles. , The adsorptive affinity of contaminants to DOM and the adsorption of DOM to mineral surfaces has also been linked to molecular weight. − Finally, the molecular weight of DOM is tied to the formation of disinfection byproducts (DBPs), filter fouling, and the fate of pollutants during and after water treatment processes. − In short, accurate molecular weight measurements of DOM are necessary to understand its role in environmental, biogeochemical, and engineered processes.…”

Spectroscopic in situ examination of interactions of rare earth ions with humic substances

“…On the other hand, spectroscopic properties of HS themselves are affected by their interactions with metal ions thus providing an opportunity to quantify HS-REI complexation via measurements of the absorbance and emission spectra of HS. Spectroscopic properties of HS of different provenance have been intensively investigated in prior research (Del Vecchio and Blough, 2004;Henderson et al, 2009;Park, 2009;Baker et al, 2008;Fabbricino and Korshin, 2005;Gao and Korshin, 2013;Sharpless and Blough, 2014). Fluorescence (including time-resolved fluorescence of Eu 3þ ion itself) (Janot et al, 2013;Monsallier et al, 2001;Brevet et al, 2009) and in much lesser extent absorbance spectroscopic methods have been applied to generate information necessary to understand metal-HS binding.…”