Complexation of arsenate with humic substance in water extract of compost

Lin, Haw-Tarn; Wang, M.C; Li, Gwo-Chen

doi:10.1016/j.chemosphere.2004.05.018

Cited by 133 publications

(73 citation statements)

References 21 publications

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“…Using an equilibrium dialysis method, Buschmann et al (2006) suggest that about 10% of As(V) may bound to HA through phenolate functional groups in HA. However, the findings of Lin et al (2004) show that no As(V)-DOM complexes is formed in extract of compost free of metals, whereas 30%-50% As(V) is associated with DOM in the presence of metals.…”

Section: Introductionmentioning

confidence: 87%

“…Generally accepted concept is that HA and As(V) can not form covalent bond because they are both anions, and indirect association of HA and As(V) through metal bridging is the primary mechanism (Redman et al, 2002;Lin et al, 2004). On the other hand, direct association of HA and As(V) has been reported under high HA concentrations at 1500 mg/L (Warwick et al, 2005).…”

Section: Sers Studymentioning

confidence: 99%

“…Previous studies suggest that As(V) could be bound to HA through a ternary metal complexation mechanism: As(V)-metal cation-HA (Redman et al, 2002;Lin et al, 2004), and such complexes could be within colloidal size (Ritter et al, 2006). Recently, similar with As(III)-HA complex (Liu and Cai, 2012), direct association of aqueous As(V) and HA has been reported through covalent binding mechanisms (Warwick et al, 2005;Buschmann et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Removal of arsenate with hydrous ferric oxide coprecipitation: Effect of humic acid

Jing

Duan

et al. 2014

Journal of Environmental Sciences

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a b s t r a c tInsights from the adverse effect of humic acid (HA) on arsenate removal with hydrous ferric oxide (HFO) coprecipitation can further our understanding of the fate of As(V) in water treatment process. The motivation of our study is to explore the competitive adsorption mechanisms of humic acid and As(V) on HFO on the molecular scale. Multiple complementary techniques were used including macroscopic adsorption experiments, surface enhanced Raman scattering (SERS), extended X-ray absorption fine structure (EXAFS) spectroscopy, flow-cell attenuated total reflectance Fourier transform infrared (ATR-FTIR) measurement, and charge distribution multisite complexation (CD-MUSIC) modeling. The As(V) removal efficiency was reduced from over 95% to about 10% with the increasing HA concentration to 25 times of As(V) mass concentration. The SERS analysis excluded the HA-As(V) complex formation. The EXAFS results indicate that As(V) formed bidentate binuclear surface complexes in the presence of HA as evidenced by an As-Fe distance of 3.26-3.31 Å. The in situ ATR-FTIR measurements show that As(V) replaces surface hydroxyl groups and forms innersphere complex. High concentrations of HA may physically block the surface sites and inhibit the As(V) access. The adsorption of As(V) and HA decreased the point of zero charge of HFO from 7.8 to 5.8 and 6.3, respectively. The CD-MUSIC model described the zeta potential curves and adsorption edges of As(V) and HA reasonably well.

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Section: Introductionmentioning

confidence: 87%

Section: Sers Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Removal of arsenate with hydrous ferric oxide coprecipitation: Effect of humic acid

Jing

Duan

et al. 2014

Journal of Environmental Sciences

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“…Arsenate adsorbs onto solid phase humic acids more extensively than arsenite, with amine (NH 2 ) groups suspected as the primary functional group responsible for arsenic retention (Thanabalsingam and Pickering, 1986a). Arsenic adsorption by humic substances is also enhanced by cation addition, particularly Fe, Al and Mn, whereby the cations act as bridging complexes for arsenate on humic acids (Lin et al, 2004). Nevertheless, organic matter tends to be poorly correlated with total As in comparison to Fe, Al, or P (Chen et al, 2002), suggesting that its contribution to arsenic retention in soils and sediments is limited.…”

Section: Adsorption Reactionsmentioning

confidence: 96%

Arsenic Chemistry in Soils and Sediments

Fendorf

Nico

Kocar

et al. 2010

Synchrotron-Based Techniques in Soils and Sediments

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“…On the other hand, there is evidence that in many cases, after binding toxicants to humic substances (HS), their aggressive potential is significantly reduced (Stom et al, 1992;Lin et al, 2004;Buschmann et al, 2006;Perminova et al, 2006;Janoš et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Change in Toxicity of Model Arsenic Contaminant in the Presence of Humates and Activated Zeolites

Стом¹,

Konovalov²,

Бутырин³

et al. 2014

MAS

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Using the methods of chemical analysis and bioassays, we investigated the toxicity and detoxication of model solutions containing arsenic salts. The ability of zeolites to absorb arsenic from model solutions was examined. Commercially available humic substances ("Powhumus", "Humate-80"), as well as zeolites, activated with their application were shown to reduce toxic effect of pollutants. Zeolite activated by degassing, decationization, thermal and chemical treatment showed the highest sorbent efficiency.

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Complexation of arsenate with humic substance in water extract of compost

Cited by 133 publications

References 21 publications

Removal of arsenate with hydrous ferric oxide coprecipitation: Effect of humic acid

Removal of arsenate with hydrous ferric oxide coprecipitation: Effect of humic acid

Arsenic Chemistry in Soils and Sediments

Change in Toxicity of Model Arsenic Contaminant in the Presence of Humates and Activated Zeolites

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