Carbon nanodot aqueous binding phase-based diffusive gradients in thin films device for measurement of dissolved copper and lead species in the aquatic environment. Issue 22 (11th October 2018)

• Record Type: Journal Article
• Authors: You, Nan; Feng, Zhong-Ming; Wang, Yun; Fan, Hong-Tao; Sun, Ting
• Is Part Of: Analyst. Volume 143:Issue 22(2018)
• Page Start: 5568
• Page End: 5577
• Publication Date: 2018-10-11
• Subjects: Chemistry, Analytic -- Periodicals; 543
• DOI: 10.1039/c8an00612a
• Languages: English
• ISSNs: 0003-2654

Abstract

Abstract : A reliable method for the determination of dissolved Cu 2+ and Pb 2+ species in water via a diffusive gradient in thin films (DGT) device using water-soluble carbon nanodots (CD) as the binding agent was developed (CD-DGT). Abstract : A reliable method for the determination of dissolved Cu 2+ and Pb 2+ species in water via a diffusive gradient in thin films (DGT) device using water-soluble carbon nanodots (CD) as the binding agent was developed (CD-DGT). The uptake of dissolved Cu 2+ and Pb 2+ species by CD-DGT increased linearly with a deployment time of over 120 h, while the uptake of Ca 2+, Mg 2+, Cd 2+, Zn 2+, Ni 2+, and Co 2+ by CD-DGT has no significant linear accumulation during the same deployment time. The concentrations of the dissolved Cu 2+ and Pb 2+ species measured using CD-DGT are in good agreement with the element concentrations spiked directly in a tested synthesis solution. The performance of CD-DGT for the determination of dissolved Cu 2+ and Pb 2+ species is found to be independent of ionic strength in the range of 0.001–0.05 mol L −1 and in the pH range from 5 to 8. The presence of fulvic acid and tannic acid has no significant influence on the uptake of dissolved Cu 2+ and Pb 2+ species by CD-DGT under the tested conditions. In different water samples, good agreement was observed between the dissolved Cu 2+ and Pb 2+ concentrations measured by CD-DGT, and diffusive equilibration in the thin film devices was found. Based on the results obtained, CD-DGT enables the selective and quantitative determination of dissolved Cu 2+ and Pb 2+ species in water.