Electrostatic effects on ligand-assisted transfer of metals to (bio)accumulating interfaces and metal complexes (bioavai)lability

Electroanalytical Trace Metal Cations Quantification and Speciation in Freshwaters: Historical Overview, Critical Review of the Last Five Years and Road Map for Developing Dynamic Speciation Field Measurements

“…The treatment applies for particles ranging from soft/core-shell to hard particles considering their volume and surface binding site distributions, respectively. Finally, in 2023 [ 67 ], they described the effect of the electric charge at a reactive interface on the diffusion rate of ionic species towards the interface and their local concentration profiles. They proposed a coupled steady-state Nernst-Planck equations for metal cations, ligands and metal complexes, including the correction for interfacial electrostatics and chemical kinetics, in order to obtain the metal surface flux and the spatial distributions of these species.…”

Kinetics of metal detection by luminescence-based whole-cell biosensors: connecting biosensor response to metal bioavailability, speciation and cell metabolism

“…not accumulated by the metal M-sensing bacteria. Following the procedure detailed elsewhere, 13,36 the exact solution of eqn ( 1) and ( 2) can be written in the form…”

“…with p ML = p o /(1 À j 1/3 ), and p o is the (dimensionless) scalar defined by p o = 1 + e % K ML x which quantifies the contribution of ML to the M supply flux as a function of ML lability parameter x (0 r x r 1) defined by Duval et al 13 (cf. eqn (22) in ref.…”

“…the extent to which ML dissociates and releases free M on the timescale of its diffusion towards the bioaccumulating surface. [11][12][13][14] Then, depending on the demands of the organism and on the lability of ML complex, the latter may dissociate in the vicinity of the organism and thereby contributes to the biouptake of free M (Fig. 1).…”

“…1). 11,13,14 Concepts have been developed for describing the dynamics of chemical speciation in aqueous media in the context of an ongoing interfacial process that consumes free metals at a given surface, may it be a metal-sensor or a microorganism. 9 Based on these concepts, it was shown that applicability of BLM is conditioned to a sufficiently fast transport of metal species in solution as compared to the actual metal uptake so that the latter is rate-determining.…”