Ionic Speciation of Ecotoxic Lead (2+), Cadmium (2+), and Naturally Occurring Ions with Dissolved Organic Matter in Seawater from the Bay of Bengal by Differential Pulse Anodic Stripping Voltammetry, Continuous Binding Model, and Computational Chemical Equilibria: Effect of Global Warming

Le résumé fourni par la source

An experimental and computational methodology was developed for ionic speciation of Pb2+ and Cd2+ with dissolved organic matter (DOM) in surface seawater (SSW) from the Bay of Bengal (BoB) in eastern Bangladesh. Differential pulse anodic stripping voltammetry (DPASV) with a thin mercury film glassy carbon electrode (TMFGC) was used to measure free and DOM-bound Pb2+ and Cd2+. A continuous binding model was used to calculate the binding constants for metal ions with experimentally found complex ligands like DOM in the BoB. The ionic speciation and distribution of all major naturally occurring ions and toxic Pb2+, Cd2+, and DOM were calculated using a computational chemical equilibrium model, MINTEQA. We found that the change in pH with increasing dissolved carbon dioxide due to global warming will cause drastic changes in the bioavailability of Pb2+ by the year 2050.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.