2 / 8
Page 13
Notes:
allied
academies
Asian Journal of Biomedical and Pharmaceutical Sciences | ISSN: 2249-622X | Volume 8
&
Joint Event
Chemistry and Organic Chemistry
Biomedicine & Pharmacotherapy
International Conference on
8
th
World Congress on
October 22-23, 2018 | Frankfurt, Germany
Separation of tin from tellurium: Effects of chloride and sulfate interferences
Mohammad Majibur Rahman
University of Ottawa, Canada
Q
uantification of tin isotopes in environmental samples,
especially the radioactive 126Sn, is important for
processes such as the biomonitoring of organotin species, long-
term nuclear waste storage and treatment planning. However,
the detection of 126Sn by mass spectrometric methods, like
Accelerator Mass Spectrometry (AMS), is hampered by the
presence of the stable 126Te. Therefore, separation of tin from
tellurium is crucial to minimize isobaric interferences. In the
present study, the determination of distribution coefficients
(KD, metal adsorbed in solid phase over metal retained in
liquid phase) of Sn and Te onto TRU chromatographic resin
in presence of Cl
–
and SO
4
2–
solutions were evaluated using
ICP-MS technique. The KD values of Sn and Te with real field
water (surface and groundwater) samples, and the adsorption-
desorption study of Sn and Te with field water spikes were
also discussed. Results reveal that the average KD for tin in
aqueous hydrochloric acid (HCl) with the Cl
–
-spike produced an
increase of 11%, whereas the mixed-spiked (both Cl
–
and SO
4
2–
) sample faced a reduction by 7% compared to that of the
unspiked sample. The KD values of tellurium in the presence of
tested anionic species remained unchanged. This observation
demonstrates that the distribution coefficients of tin and
telluriumonto the solid phase is barely affected by the presence
of Cl
–
and SO
4
2–
contaminants (each present at concentrations
of 70.0 mg L–1). Moreover, the adsorption of metal in the
presence of Cl
–
and SSO
4
2–
spikes on the resin is favored at pH
values from4.0 to 5.0, and the optimumtime for the bestmetal-
resin interaction is around 90 minutes. A thorough adsorption-
desorption study for tin and tellurium with spiked field water
samples (surface and groundwater) show that at least 99% tin is
adsorbed, while the adsorption of tellurium can be maintained
at a level as low as 60%. Aqueous hydrofluoric acid (HF) can
then selectively elute 85% of tin (with a single wash of 100 mg
of resin) with tellurium release of less than 10%. Our proposed
methodology can be applied successfully for the selective
separation of tin from tellurium from surface and groundwater
samples contaminated with Cl
–
and SO
4
2–
ions.
Speaker Biography
Mohammad Majibur Rahman has completed his MSc (in Chemistry) from Jahangirnagar
University, Bangladesh, and an MSc (in Environmental Science) from Memorial University
of Newfoundland, Canada. He has just submitted his PhD thesis in the Department of
Earth and Environmental Sciences, University of Ottawa, Canada. He is a professor at the
Department of Environmental Sciences at Jahangirnagar University. His research interest
focuses on the measurement of radioisotopes, especially 126Sn, using Accelerator Mass
Spectrometry (AMS).
e:
mmaji034@uottawa.caMohammad Majibur Rahman, Chemistry and Biomedicine 2018, Volume 8
DOI: 10.4066/2249-622X-C4-011