Measurement of diffusion coefficients of thallium ion in H2O and D2O systems at different concentrations

In Situ Measurement of Thallium in Natural Waters by a Technique Based on Diffusive Gradients in Thin Films Containing a δ-MnO2 Gel Layer

“…The mass of diffused Tl­(I) and Tl­(III) into the receptor cell increased linearly with time (correlation coefficient r 2 = 0.99 for both Tl­(I) and Tl­(III), p < 0.05), implying that there was a stable diffusion process of the measured Tl during the experimental period. Diffusion coefficient of Tl­(I) in water, D water , is 15.34 × 10 –6 cm 2 ·s –1 at 25 °C . Diffusion coefficients, D cell , of Tl­(I) and Tl­(III) calculated by use of eq are listed in Table S3.…”

“…Generally, the elution efficiencies of Tl(I) were higher than Tl(III) for all the eluents. HNO3 is usually used to elute metals from the Chelex binding gels, so here it was used as well for Tl elution from the 53 and Tl(III) complexes with covalent bonding were much more difficult to pass through the diffusive gel. Tl(I) Dcell was about 106% of Tl(I) DDGT and the difference between these two values from two different methods was less than 6%, suggesting that measured D here was reasonable.…”