Fractionation and size-distribution of metal and metalloid contaminants in a polluted groundwater rich in dissolved organic matter

Kozyatnyk, Ivan; Bouchet, Sylvain; Björn, Erik; Haglund, Peter

doi:10.1016/j.jhazmat.2016.07.024

Cited by 44 publications

(11 citation statements)

References 58 publications

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“…Therefore, it is not likely that these substances saturated the hydrochar surface, but instead exposed more of the surface. Decreased adsorption in the presence of DOC may therefore be explained by the adsorption of contaminants to DOC (instead of hydrochar), which means that the contaminants stay in the water (Kozyatnyk et al 2015 , 2016 ). In contrast, if agglomerates form, for instance, due to increasing DOC concentrations and/or the presence of salts, the adsorbates may be removed with the agglomerates during filtering.…”

Section: Resultsmentioning

confidence: 99%

Influence of water matrix and hydrochar properties on removal of organic and inorganic contaminants

Niinipuu

Bergknut²,

Boily

et al. 2020

Environ Sci Pollut Res

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The removal of contaminants from water using low-cost adsorbents has been widely studied, yet studies employing a realistic water matrix are still lacking. This study investigated the removal of organic compounds (trimethoprim, fluconazole, and perfluorooctanoic acid (PFOA)) and metals (As, Zn, and Cu) from landfill leachate. Additionally, tests in pure water, humic acid, and ion matrices were carried out to better understand how the water matrix affects adsorption. The hydrochars were produced from four feedstocks at three carbonization temperatures. The results show that the removal efficiencies for organic pollutants were low and metal removal by hydrochars was comparable with commercial activated carbon. The removal of all compounds from pure water was substantially lower. Tests with humic acid and ion-containing matrices could not fully explain the increased removal in the landfill leachate, which may be due to the combination of the water matrix and presence of soluble species from the hydrochars.

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Section: Resultsmentioning

confidence: 99%

Influence of water matrix and hydrochar properties on removal of organic and inorganic contaminants

Niinipuu

Bergknut²,

Boily

et al. 2020

Environ Sci Pollut Res

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“…The impacts of these materials, including colloid or DOC biopolymers, on the ecosystem, could be vast, for example, in their participation in various biogeochemical reactions such as microbial loop, element exchange, light absorption and food webs [1,2]. Some studies also indicated that DOC alters the mobility of pollutants which in turn affects their bioavailability, and acts as a critical regulator for pollutant toxicity [3][4][5]. The capability of these materials comes from some functional groups present within the natural organic matter structure, such as polysaccharides, proteins, lipids, nucleic acids and various functional group types (carboxylate, sulfate, and phosphate) [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Role of microgel formation in scavenging of chromophoric dissolved organic matter and heavy metals in a river-sea system

Shiu

Lee

2017

Journal of Hazardous Materials

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We use riverine and marine dissolved organic carbon (DOC) polymers to examine their aggregation behavior, and to evaluate the roles of microgel formation in scavenging of chromophoric dissolved organic matter (CDOM) and heavy metals in a river-sea system. Our results indicate that riverine and marine microgels did not exhibit very much difference in size and self-assembly curve; however, the assembly effectiveness ([microgel]/DOC) of marine samples was much higher than riverine. Instead of concentration of DOC, other factors such as types and sources of DOC polymers may control the microgel abundance in aquatic environments. After filtering water samples (microgels removed), the CDOM and selected metals (Cu, Ni, Mn) in the filtrate were quantified. CDOM and metals were concurrently removed to an extent via DOC polymer re-aggregation, which also suggested that the microgels had sequestering capability in CDOM and metals. This finding provides an alternative route for CDOM and heavy metals removal from the water column. As such the process of re-aggregation into microgels should then be considered besides traditional phase partitioning in the assessment of the ecological risk and fate of hazardous materials.

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“…No stand-alone technique is available to date for the assessment of the lability of Hg–DOM complexes. Therefore, the use of AF4–UVD–FluoD–ICP-MS, together with techniques providing the relative binding strength and the redox state of Hg (e.g., Liang et al, 2019 ), and determining the thiol components and their Hg binding capacity in the size range uncovered by AF4 (e.g., Kozyatnyk et al, 2016 ; Adediran et al, 2019 ) will be of high relevance. Additionally, the proportions of nano-HgS must be assessed as they can account for stable and small-sized mercury species certainly formed before 24 h, as recently discussed in Bourdineaud et al (2019 ).…”

Section: Resultsmentioning

confidence: 99%

Asymmetrical Flow Field-Flow Fractionation Methods for Quantitative Determination and Size Characterization of Thiols and for Mercury Size Speciation Analysis in Organic Matter-Rich Natural Waters

et al. 2022

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Asymmetrical flow field-flow fractionation (AF4) efficiently separates various macromolecules and nano-components of natural waters according to their hydrodynamic sizes. The online coupling of AF4 with fluorescence (Fluo) and UV absorbance (UV) detectors (FluoD and UVD, respectively) and inductively coupled plasma–mass spectrometry (ICP-MS) provides multidimensional information. This makes it a powerful tool to characterize and quantify the size distributions of organic and inorganic nano-sized components and their interaction with trace metals. In this study, we developed a method combining thiol labeling by monobromo(trimethylammonio)bimane bromide (qBBr) with AF4–FluoD to determine the size distribution and the quantities of thiols in the macromolecular dissolved organic matter (DOM) present in highly colored DOM-rich water sampled from Shuya River and Lake Onego, Russia. We found that the qBBr-labeled components of DOM (qB-DOM) were of humic type, characterized by a low hydrodynamic size (dh < 2 nm), and have concentrations <0.3 μM. After enrichment with mercury, the complexes formed between the nano-sized components and Hg were analyzed using AF4–ICP-MS. The elution profile of Hg followed the distribution of the UV-absorbing components of DOM, characterized by slightly higher sizes than qB-DOM. Only a small proportion of Hg was associated with the larger-sized components containing Fe and Mn, probably inorganic oxides that were identified in most of the samples from river to lake. The size distribution of the Hg–DOM complexes was enlarged when the concentration of added Hg increased (from 10 to 100 nM). This was explained by the presence of small iron oxides, overlapping the size distribution of Hg–DOM, on which Hg bound to a small proportion. In addition, to provide information on the dispersion of macromolecular thiols in colored DOM-rich natural water, our study also illustrated the potential of AF4–FluoD–UVD–ICP-MS to trace or quantify dynamic changes while Hg binds to the natural nano-colloidal components of surface water.

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Fractionation and size-distribution of metal and metalloid contaminants in a polluted groundwater rich in dissolved organic matter

Cited by 44 publications

References 58 publications

Influence of water matrix and hydrochar properties on removal of organic and inorganic contaminants

Influence of water matrix and hydrochar properties on removal of organic and inorganic contaminants

Role of microgel formation in scavenging of chromophoric dissolved organic matter and heavy metals in a river-sea system

Asymmetrical Flow Field-Flow Fractionation Methods for Quantitative Determination and Size Characterization of Thiols and for Mercury Size Speciation Analysis in Organic Matter-Rich Natural Waters

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