Comparing dissolved reactive phosphorus measured by DGT with ferrihydrite and titanium dioxide adsorbents: Anionic interferences, adsorbent capacity and deployment time

Panther, Jared G.; Teasdale, Peter R.; Bennett, William W.; Welsh, David T.; Zhao, Huijun

doi:10.1016/j.aca.2011.04.049

Cited by 43 publications

(60 citation statements)

References 45 publications

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“…The sorption capacity of ZnFe 2 O 4 binding gel (i.e., the maximum amount of analyte linearly accumulated according to DGT theory [26]) are determined by deploying DGT probes in borate buffer solution adjusted at pH 7.5 spiked at 10 mg L À 1 of each inorganic As components separately. Several deployment times are tested in triplicate: 0, 1, 2, 3, 4, 7, 13 and 15 h.…”

Section: Sorption Capacitymentioning

confidence: 99%

Determination of total arsenic using a novel Zn-ferrite binding gel for DGT techniques: Application to the redox speciation of arsenic in river sediments

Gorny

Lesven

Billon

et al. 2015

Talanta

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Section: Sorption Capacitymentioning

confidence: 99%

Determination of total arsenic using a novel Zn-ferrite binding gel for DGT techniques: Application to the redox speciation of arsenic in river sediments

Gorny

Lesven

Billon

et al. 2015

Talanta

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“…Titanium dioxide can adsorb both, anions and cations, on the positively and negatively charged surface, what indicates a wide operational pH range. Metsorb™ is selective for As(V), PO 4 3À , Se(IV) or V(V), therefore its efficacy for the U determination might be mitigated, especially in the mining environments, where the concentrations of abovementioned elements can be elevated [14,18]. Diphonix ® (Eichrom Technologies, USA) is a strong cation-chelating resin with diphosphonic acid and sulphonic acid as functional groups (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…This U uptake diminution in the presence of a greater PO 4 3À concentration is presumably a consequence of the direct competition for the binding sites between uranium phosphate complexes and dihydrogen phosphate ion[19,58]. The greater impact of increasing PO 4 3À concentration on the performance of Metsorb™-DGT is most likely due to the fact that Metsorb™ adsorbent was successfully used beforehand for the measurement of the dissolved reactive phosphorus in an aqueous solution[14,60]. The U uptake on the Diphonix ® -DGT was quantitative over experimental PO 4 3À concentration range.It is also noteworthy that small, but significant decrease in U concentration at high PO4 3À concentrations has been observed, which is most likely attributed to the precipitation of U. Uranyl phosphate complexes are extremely insoluble under circumneutral pH conditions (e.g.…”

mentioning

confidence: 99%

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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“…In the last two decades the diffusive gradients in a thin film (DGT) technique has demonstrated its capability as an effective kinetic passive sampler for selective measurement of many elements in water [1][2][3][4][5]. An adsorbent material embedded in a polyacrylamide hydrogel (binding layer) accumulates reactive analyte species after they diffuse through another layer of known thickness.…”

Section: Introductionmentioning

confidence: 99%

A systematic determination of diffusion coefficients of trace elements in open and restricted diffusive layers used by the diffusive gradients in a thin film technique

Shiva

Teasdale

Bennett

et al. 2015

Analytica Chimica Acta

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A systematic comparison of the diffusion coefficients of cations (Al, Cd, Co, Cu, Mn, Ni, Pb, Zn) and oxyanions (Al, As, Mo, Sb, V, W) in open (ODL) and restricted (RDL) diffusive layers used by the DGT technique was undertaken. Diffusion coefficients were measured using both the diffusion cell (Dcell) method at pH 4.00 and the DGT time-series (D(DGT)) method at pH 4.01 and 7.04 (pH 8.30 was used instead of 7.04 for Al) using the Chelex-Metsorb mixed binding layer. The performance of Chelex-Metsorb as a new DGT binding layer for Al uptake was also evaluated for the first time. Reasonable agreement was observed between D(cell) and D(DGT) measurements for both ODL and RDL, except for V and W. The ratios of D(cell)/D(DGT) for V of 0.44 and 0.39, and for W of 0.66 and 0.63 with ODL and RDL respectively, were much lower due to the formation of a high proportion of polyoxometalate species at the higher concentrations required with the D(cell) measurements. This is the first time that D values have been reported for several oxyanions using RDL. Except for Al at pH 8.30 with ODL, all D(DGT) measurements were retarded relative to diffusion coefficients in water (DW) for both diffusive hydrogels. Diffusion in RDL was further retarded compared with ODL, for all elements (0.66-0.78) with both methods. However, the degree of retardation observed changed for cations and anions at each pH. At pH 7.04 cations had a slightly higher D(DGT) and oxyanions had a slightly lower D(DGT) than at pH 4.01 for both ODL and RDL. It is proposed that this is due to partial formation of acrylic acid functional groups (pKa ≈4.5), which would be fully deprotonated at pH 7.04 (negative) and mostly protonated at pH 4.01 (neutral). As Al changes from being cationic at pH 4.01 to anionic at pH 8.30 the results were more complex.

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Comparing dissolved reactive phosphorus measured by DGT with ferrihydrite and titanium dioxide adsorbents: Anionic interferences, adsorbent capacity and deployment time

Cited by 43 publications

References 45 publications

Determination of total arsenic using a novel Zn-ferrite binding gel for DGT techniques: Application to the redox speciation of arsenic in river sediments

Determination of total arsenic using a novel Zn-ferrite binding gel for DGT techniques: Application to the redox speciation of arsenic in river sediments

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

A systematic determination of diffusion coefficients of trace elements in open and restricted diffusive layers used by the diffusive gradients in a thin film technique

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