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

In situ speciation of dissolved inorganic antimony in surface waters and sediment porewaters: development of a thiol-based diffusive gradients in thin films technique for SbIII

“…Such an approach to in situ speciation using DGT has been described in detail previously for inorganic arsenic. 19,25 Effect of pH, ionic strength, bicarbonate concentration, and artificial seawater. The performance of mercapto-silica DGT and Metsorb DGT under various solution conditions is summarised in Table 2. Both mercapto-silica DGT and Metsorb DGT show acceptable performance under all tested conditions, indicating that these techniques can be deployed in a variety of natural water types with confidence.…”

Passive sampler measurements of inorganic arsenic species in environmental waters: A comparison between 3-mercapto-silica, ferrihydrite, Metsorb®, zinc ferrite, and zirconium dioxide binding gels

“…DGT techniques appear to be an interesting alternative for studying As speciation in river sediments compared to traditional ex situ approaches consisting in extracting porewater samples in several steps under nitrogen atmosphere. Bennett and co-workers [1] commented on our previous works describing a new DGT method using a zinc ferrite (ZnFe2O4) binding gel for the determination of total arsenic (As) at low concentration in the sediments of the Marque River, northern France [2]. In that study, the DGT performances of the ZnFe2O4 binding gel were compared to that of the ferrihydrite (Fh) and…”

“…We have explored the possibility to use different buffers at 0.1 mol L -1 between pH 5 and 9, since it is difficult to maintain the pH of diluted NaNO3 solution during several hours without an automatic pH titrator. In particular, the potential effect of a high content oftheH3BO3 buffer (pH 7.5-9) on the DGT response is evaluated in batch experiments, as boric acid could inhibit the accumulation of inorganic As species on the Metsorb ® binding gel [2].…”

“…Our previous results had also suggested that the Metsorb ® -DGT was not suitable for measuring total As concentration in seawater. Investigations from time-series accumulation experiments are performed in more realistic matrixes to resolve the inconsistencies between our previous study [2]and prior research published in the field [4,8,9].…”

Comments on “Determination of total arsenic using a novel Zn-ferrite binding gel for DGT techniques: Application to the redox speciation of arsenic in river sediments” by Gorny et al.

“…Gorny et al recently described a new diffusive gradients in thin films (DGT) technique, which utilizes a binding gel layer containing zinc ferrite, for the measurement of total arsenic in natural waters [1].…”