Lability of metal ion-fulvic acid complexes as probed by FIA and DGT: a comparative study

Downard, Alison J.; Panther, Jared G.; Kim, Young-Chool; Powell, Kipton J.

doi:10.1016/s0003-2670(03)00947-4

Cited by 22 publications

(14 citation statements)

References 25 publications

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“…At higher pH values, the binding phase is inducing the dissociation of the neutral and negatively charged uranyl carbonate species present in the solution into UO 2 2þ . Most likely, in diffusion cell experiment UO 2 2þ is bound to excess dissolved CO 2 and then diffuses through the diffusive layer without the dissociation, thus much slower that UO 2 2þ [49,50]. This can be particularly observed at pH 9 where UO 2 ðCO 3 Þ 3 4À (log K ¼ À9.14)…”

Section: Diffusion Coefficients Of U Species Over the Ph Rangementioning

confidence: 96%

Evaluation and application of Diffusive Gradients in Thin Films (DGT) technique using Chelex®-100, Metsorb™ and Diphonix® binding phases in uranium mining environments

Drozdzak

Leermakers

Gao

et al. 2015

Analytica Chimica Acta

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A new resin- Diphonix(®) in Diffusive Gradients in Thin Films (DGT) technique for the determination of uranium was investigated and compared with previously used binding phases for uranium, Chelex(®)-100 and Metsorb™. The DGT gel preparation and the elution procedure were optimized for the new resin. The U uptake on Diphonix(®) resin gel was 97.4 ± 1.5% (batch method; [U] = 20 μg L(-1); 0.01 M NaNO3; pH = 7.0 ± 0.2). The optimal eluent was found to be 1 M 1-hydroxyethane-1, 1-diphosphonic acid (HEDPA) with an elution efficiency of 80 ± 4.2%. Laboratory DGT study on U accumulation using a DGT samplers with Diphonix(®) resin showed a very good performance across a wide range of pH (3-9) and ionic strength (0.001-0.7 M NaNO3). Diffusion coefficients of uranium at different pH were determined using both, a diffusion cell and the DGT time-series, demonstrating the necessity of the implementation of the effective diffusion coefficients into U-DGT calculations. Diphonix(®) resin gel exhibits greater U capacity than Chelex(®)-100 and Metsorb™ binding phase gels (a Diphonix(®) gel disc is not saturated, even with loading of 10.5 μmol U). Possible interferences with Ca(2+) (up to 1.33 × 10(-2) M), PO4(3-) (up to 1.72 × 10(-4) M), SO4(2-) (up to 4.44 × 10(-3) M) and HCO3(-) (up to 8.20 × 10(-3) M) on U-DGT uptake ([U] = 20 μg L(-1)) were investigated. No effect or minor effect of Ca(2+), PO4(3-), SO4(2-), and HCO3(-) on the quantitative measurement of U by Diphonix(®)-DGT was observed. The results of this study demonstrated the DGT technique with Diphonix(®) resin is a reliable and robust method for the measurement of labile uranium species under laboratory conditions.

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Section: Diffusion Coefficients Of U Species Over the Ph Rangementioning

confidence: 96%

Evaluation and application of Diffusive Gradients in Thin Films (DGT) technique using Chelex®-100, Metsorb™ and Diphonix® binding phases in uranium mining environments

Drozdzak

Leermakers

Gao

et al. 2015

Analytica Chimica Acta

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“…The nature of these interactions is not well understood; it has been proposed that As V and As III species associate with the negatively charged fulvic acid by metal bridging mechanisms involving Fe III and Al III [38,40,41] or that Fe III -fulvic acid colloids may provide binding sites for the adsorption of As [41]. Formation of soluble As-Fe III -fulvic acid complexes is expected to decrease the amount of As accumulated by DGT, both for inert complexes and for labile complexes for which the diffusion rate will be lower than for free As [28,42].…”

Section: Combined Effects Of Fulvic Acid and Dissolved Fe III And Omentioning

confidence: 99%

“…The effect of soluble Fe-fulvic acid complexes on the DGT response was examined by deploying DGT devices (22-29 h) in As V (54-66 g L −1 ) solutions containing 5 mg L −1 fulvic acid and Fe III concentrations ranging from ∼0.24 to ∼2.8 mol L −1 (concentrations assumed to be lower than the complexation capacity [42]). Solutions were equilibrated for 24 h before DGT devices were deployed.…”

Section: Combined Effects Of Fulvic Acid and Dissolved Fe III And Omentioning

confidence: 99%

Development and application of the diffusive gradients in thin films technique for the measurement of total dissolved inorganic arsenic in waters

Panther

Stillwell

Powell

et al. 2008

Analytica Chimica Acta

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“…(1,20) The in situ diffusive gradients in thin film (DGT) technique (21,22) is one such option that has been utilized to measure Al in soils and natural waters. (23)(24)(25)(26)(27)(28)(29)(30) 4…”

Section: Introductionmentioning

confidence: 99%

DGT Measurement of Dissolved Aluminum Species in Waters: Comparing Chelex-100 and Titanium Dioxide-Based Adsorbents

Panther

Bennett

Teasdale

et al. 2012

Environ. Sci. Technol.

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Aluminum is acutely toxic, and elevated concentrations of dissolved Al can have detrimental effects on both terrestrial and aquatic ecosystems. Robust analytical methods that can determine environmentally relevant Al fractions accurately and efficiently are required by the environmental monitoring community. A simple, robust passive sampling method, the diffusive gradients in thin films (DGT) technique, was evaluated for the measurement of dissolved Al species in freshwater and marine water using either Chelex-100 or Metsorb (a titanium dioxide-based binding agent) as the adsorbent. Mass vs time DGT deployments at pH 5.05 (Al(3+) and Al(OH)(2+) dominate) and 8.35 (Al(OH)(4)(-) dominates) demonstrated linear uptake of Al (R(2) = 0.989 and 0.988, respectively) for Metsorb. Similar deployments of Chelex-DGT showed linear uptake at pH 5.05 (R(2) = 0.994); however, at pH 8.35 the mass of Al accumulated was 40-70% lower than predicted, suggesting that Chelex-100 is not suitable for Al measurements at high pH. The Metsorb-DGT measurement was independent of pH (5.0-8.5) and ionic strength (0.001-0.7 mol L(-1) NaNO(3)), whereas the Chelex-DGT measurement was only independent of ionic strength at pH 5.0. At pH 8.4, increasing ionic strength led to considerable underestimation (up to 67%) of Al concentration. Deployments of Metsorb-DGT (up to 4 days) in synthetic freshwater (pH range 5.4-8.1) and synthetic seawater (pH 8.15) resulted in linear mass uptakes, and the concentration measured by DGT agreed well with solution concentrations. Conversely, deployment of Chelex-DGT in synthetic seawater and freshwater (pH ≥7.7 Al(OH)(4)(-) dominant species) resulted in a decrease in accumulated mass with increasing deployment time. In situ field evaluations in fresh, estuarine, and marine waters confirmed that Metsorb-DGT was more accurate than Chelex-DGT for the measurement of dissolved Al in typical environmental waters.

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Lability of metal ion-fulvic acid complexes as probed by FIA and DGT: a comparative study

Cited by 22 publications

References 25 publications

Evaluation and application of Diffusive Gradients in Thin Films (DGT) technique using Chelex®-100, Metsorb™ and Diphonix® binding phases in uranium mining environments

Evaluation and application of Diffusive Gradients in Thin Films (DGT) technique using Chelex®-100, Metsorb™ and Diphonix® binding phases in uranium mining environments

Development and application of the diffusive gradients in thin films technique for the measurement of total dissolved inorganic arsenic in waters

DGT Measurement of Dissolved Aluminum Species in Waters: Comparing Chelex-100 and Titanium Dioxide-Based Adsorbents

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