Determination of Mo(vi) in water with poly(quaternary ammonium salt) as a binding phase of diffusive gradients in thin-films

Abstract

A DGT device with poly(quaternary ammonium salt) as a binding agent was developed for the sampling and measurement of Mo(vi) in waters.

Molecularly imprinted polymer based diffusive gradients in thin‐films for in situ selective sampling and determination of ciprofloxacin

“…Secondly, from Eq. , the U % value of DGT sampler should be in the range of 90–110% . The uptake of CF by CMIP‐DGT in the synthetic solution containing 0.5 μg/mL increased linearly with time up to 120 h ( r 2 = 0.998, U % = 96.8%) and fitted the theoretical line which calculated from the known solution concentrations (Figure ) .…”

“…After a deployment time ( t ), the concentration measured using DGT was calculated by Eq : where M is the mass accumulated in the binding gel, Δ g is the thickness of the diffusive layer, D is the diffusive coefficient of the analyte, and A is the exposed window area. The analyte was eluted from the binding gel with a suitable solution and M was calculated by Eq : where C e is the concentration of analyte in the eluted solution, V e and V gel are the volume of the eluent and binding gel, respectively, and ƒ e is the desorption efficiency.…”

“…Therefore, the measurement of CF free concentration is of great interest and separation and preconcentration of free CF is important for the study of CF toxic effect. Diffusive gradients in thin films (DGT) technique, an in situ passive sampling technique that employs a simple device combining a diffusive phase and a binding phase to sample and preconcentrate species of environmental analyte, has been widely employed to assess the availability, toxicity, and lability of chemicals in waters, soils, and sediments . The DGT technique can simplify the sample pretreatment procedure, eliminate the interference and matrix effects of coexisting substances and lower effective detection limits for trace species due to its preconcentration effect.…”