Determination of mercury in river water by diffusive gradients in thin films using P81 membrane as binding layer

• Published in: Talanta (Oxford) Vol. 129; pp. 417 - 421
• Main Authors: Destro Colaço, Camila, Nozomi Marques Yabuki, Lauren, Marta Rolisola, Ana, Antonio Menegário, Amauri, de Almeida, Eduardo, Alfredo Suárez, Carlos, Gao, Yue, Corns, Warren T., do Nascimento Filho, Virgílio Franco
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.11.2014
• Subjects: Cellulose - analogs & derivatives; Cellulose - chemistry; Chemistry Techniques, Analytical; Cold vapor atomic florescence spectrometry; Diffusion; Diffusive gradients in thin films technique (DGT); Environmental Monitoring - methods; Fresh Water - chemistry; Hydrogen-Ion Concentration; Ions; Labile; Mercury; Mercury - analysis; Osmolar Concentration; P81 membrane; Resins, Synthetic - chemistry; Rivers - chemistry; Sepharose - chemistry; Water Pollutants, Chemical - analysis; Labile; Cold vapor atomic florescence spectrometry; Mercury; P81 membrane; Diffusive gradients in thin films technique (DGT)
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2014.05.025

In this work, a device based on diffusive gradients in thin films (DGT) was evaluated for the determination of Hg(II) in river water. The DGT device was assembled with a cellulose phosphate ion exchange membrane (P81 Whatman) as a binding phase and agarose gel 1.5% (m/v) as a diffusive layer. Laboratory deployments showed that the binding of Hg2+ ([HgDGT]/[Hgsolution]) by P81 membrane was more effective (97%) than the Chelex 100 resin (80%).The effect of ionic strength, pH and potential interfering ions on Hg binding with DGT׳s was investigated. The results showed no significant effect on the binding of Hg(II) at pH range from 3.5 to 8.5 and at an ionic strength range from 0.0005 to 0.1molL−1. Uptakes of 50µgL−1 Hg(II) by P81 membrane were not affected by Fe, Mn, Zn, Cu, Ca and Mg at the concentration range of 200–1800µgL−1. Finally, the DGT device using the P81 as the binding layer was applied for in situ measurements of Hg in river water. For in situ measurements, the labile Hg concentration (from <2 to 13ngL−1) was lower than 10% of the dissolved fraction (from 155 to 446ngL−1). [Display omitted] •The P81 membrane DGT device for Hg2+ evaluation in river water.•The Hg uptake of the proposed approach was compared to conventional binding agent.•The effect of ionic strength, pH and interfering ions on the approach were examined.•Promising results from this approach were obtained on in situ labile Hg+2 evaluation.