Humic and Fulvic Acids as Potentially Toxic Metal Reducing Agents in Water

Lalas, Stavros; Athanasiadis, Vassilis; Dourtoglou, Vassilis

doi:10.1002/clen.201700608

Cited by 18 publications

(14 citation statements)

References 27 publications

(47 reference statements)

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“…The method used was adapted from Lalas et al. [ 11 ] Initially, 150 g of lignite and 850 g of double distilled water were mixed. NaOH (0.5 mol L −1 ) was used to adjust the pH value of the mixture to 9.…”

Section: Methodsmentioning

confidence: 99%

“…has drawn much interest in the recent years. [ 11–14 ] Additionally, the capacity of HAs to sorb cationic and hydrophobic organic contaminants is impressive. HAs can effectively interact with these contaminants, through sorption or covalent bond formation, and thus affect their mobility and transformation in soil and sediments.…”

Section: Introductionmentioning

confidence: 99%

“…Although lignite contains big amounts of both HAs and FAs, HAs are prevalent. [ 11,25 ] The lignite‐based materials are plentiful and inexpensive. In this frame, the current study examines the possibility of isolation of HAs and FAs of lignite and their ability on the binding of specific herbicides (imazamox, thifensulfuron methyl, and tribenuron methyl) from contaminated drinking water.…”

Section: Introductionmentioning

confidence: 99%

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Humic and Fulvic Acids as Specific Sorbents of Herbicides in Water

Vrantsi

Lakka

Bozinou

et al. 2021

CLEAN Soil Air Water

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The ability of humic and fulvic acids (isolated from lignite with a simple, quick, and inexpensive method) to bind the active ingredients of herbicides contaminating drinking water is evaluated. During this study drinking water samples are contaminated with formulated herbicides (imazamox or a mixture of thifensulfuron methyl and tribenuron methyl), while humic and fulvic acids are used as reducing agents. The maximum reducing ability presented by humic and fulvic acids is 72.72% for thifensulfuron methyl and tribenuron methyl and 37.52% for imazamox. Humic acids’ binding ability is superior to that of fulvic acids.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Humic and Fulvic Acids as Specific Sorbents of Herbicides in Water

Vrantsi

Lakka

Bozinou

et al. 2021

CLEAN Soil Air Water

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“…A substantial part of soil organic matter is comprised of fulvic and humic acids which have high metal binding capacity. More specifically, Zn, Pb, Ni and Cu (\ 95%) bind predominantly on fulvic acid (Donisa et al 2003;Boruvka and Drábek 2004;Lalas et al 2018). The binding preference of Cr on humic acid or fulvic acid depends on the Cr concentrations (Donisa et al 2003).…”

Section: Metal Soil Statusmentioning

confidence: 99%

Metal distribution, bioavailability and isotope variations in polluted soils from Lower Swansea Valley, UK

Schilling

Basu

Kaplan

et al. 2021

Environ Geochem Health

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Soils in the Lower Swansea Valley, (United Kingdom) contain elevated level of metals, enough to cause direct or indirect effects on human health. This study assesses the severity of soil pollution and bioavailability of Cu and other metals (Ni, Zn, Co, Pb and Cr) in soils with various distances from a Ni refinery. We compare Cu concentrations in operationally defined soil fractions (bioavailable, bound to Fe/Mn oxide and incorporated in organic matter) with other metals (Ni, Zn, Pb, Co, Cr) usually occurring in ores used in metallurgic processes and report their pollution and geoaccumulation indices (PI and I geo ). Further, we use Cu stable isotope ratios (d 65 Cu) to trace the fate and mobility of Cu in soils. Our data suggest a point source of contamination for some of the heavy metals including Ni (I geo = 1.9), Zn (I geo = 0.28) and Cu (I geo = 3.6) near the Ni refinery. However, Co (I geo = 0.15) and Pb (I geo = 3.3) contaminations are likely to be linked to different sources. No elevated Cr levels (I geo = -0.07) occur in any of the studied soils. All soil metals are predominantly associated with organic matter ([50%) which reduces their bioavailibility and thus their risk for ecological and human health. The Cu isotope data show that Cu in soil organic matter is enriched in 65 Cu, while the lighter isotopes ( 63 Cu) remain in the dissolved bioavailable Cu fraction (D 65 Cu organic-bioavailable is ?0.12 ± 0.13%). This suggests the preferential complexation of 65 Cu with soil organic matter after dissolution of Cu deposited to the soil. Thus, Cu isotope data can effectively indicate pathways of metal migration in polluted soils.

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“…Further, this study described a possible competition between copper and iron and other trace metals [13]. Moreover, investigations carried out on complexation by HS of Cd, Cr, Cu, Ni, and Pb showed that fulvic acids and HA in water are binding 95% and 83% of Cu, and 67% and 66% of Cd, respectively [14].…”

Section: Introductionmentioning

confidence: 99%

High Performance Size Exclusion Chromatography-Inductively Coupled Plasma-Mass Spectrometry to Study the Copper and Cadmium Complexation with Humic Acids

et al. 2019

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Dissolved organic matter (DOM) plays an important role in the environment by influencing the transport and distribution of organic and inorganic components through different processes: the retention, mobilization, and bio-availability of potentially toxic elements (PTEs). The aim of the present study is to examine the dimensional characterization of humic acids (HA) extracted from soil matrix, as well as to analyze the metal distribution among different ligand classes. The molecular size distribution of the HA extract from soil showed three dimensional classes: 52 KDa, 4.5 KDa, and 900 Da. HPSEC-ICP-MS measurements demonstrated that the dimensional classes, relative to first two fractions, bind the largest part of metals. The complexing capacity of HA was evaluated to assess the pollutants mobility in the environmental system. In particular, cadmium (Cd) and copper (Cu) complexation was investigated due to the great concern regarding their bio-availability and toxicity in natural waters. The complexing capacity of HA solution (20 mg/L) was measured by titration using a high-performance size exclusion chromatography (HP-SEC) coupled to an inductively coupled mass spectrometry (ICP-MS). Results obtained by this technique are compared with those obtained by anodic stripping voltammetry (ASV) to investigate the effects of kinetic lability of complexes on measurements carried by HPSEC-ICP-MS. In this study, results of ligand concentrations and stability constants obtained via the two techniques are assessed considering the detection window associated to the applied analytical methodology. Results obtained using the two analytical techniques showed that Cd is complexed by two classes of ligands. However, the ligand concentration values obtained using the two techniques are different, because the detection window associated to the two methodologies; the complexing capacity, which was obtained as sum of the two classes of ligands, were 33 nmol/L and 9 nmol/L for ASV and HPSEC-ICP-MS, respectively. The copper complexing capacities determined by the two methodologies are comparable: 166 and 139 nmol/L for ASV and HPSEC-ICP-MS, respectively. However, the results of Cu titration differ for the two techniques, highlighting only one class of ligands when ASV was used, and two classes when HPSEC-ICP-MS was employed. Differences on results obtained by the two techniques are explained considering the kinetic lability of complexes; the results show that, differently from previous studies, also Cu complexes can be kinetically labile, if one technique with high reaction time is used, as well some cadmium complexes are sufficient stable to be determined by HPSEC-ICP-MS.

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Humic and Fulvic Acids as Potentially Toxic Metal Reducing Agents in Water

Cited by 18 publications

References 27 publications

Humic and Fulvic Acids as Specific Sorbents of Herbicides in Water

Humic and Fulvic Acids as Specific Sorbents of Herbicides in Water

Metal distribution, bioavailability and isotope variations in polluted soils from Lower Swansea Valley, UK

High Performance Size Exclusion Chromatography-Inductively Coupled Plasma-Mass Spectrometry to Study the Copper and Cadmium Complexation with Humic Acids

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