Determination and speciation of trace inorganic arsenic species in water samples by using metal organic framework mixed-matrix membrane and EDXRF spectrometry

Atomic spectrometry update: review of advances in elemental speciation

“…The determination and speciation of trace iAs species in water samples using a batch adsorption process on metal–organic framework mixed-matrix membranes (miniaturised MIL-101(Fe)) and ED-XRF spectrometry has been reported. 31 The quantitative adsorption of As V was achieved at pH 3–6 from 30 mL samples and 120 min of equilibrium time employing a membrane with a monolayer adsorption capacity of 1.953 mg g −1 . The adsorbed As V was determined directly by ED-XRF with a LOD of 0.094 μg L −1 .…”

Polymeric Materials in Speciation Analysis Based on Solid-Phase Extraction

“…A similar approach for speciation analysis of inorganic arsenic was formerly developed by using a nanocomposite consisting of ditiocarbamate-modified Fe 3 O 4 @SiO 2 NPs and copper-based MOF-199 (benzene-1,3,5-tricarboxylate as an organic linker) [ 151 ]. Another implementation of MIL-101(Fe) in arsenic speciation was reported by Aslan and Tor [ 152 ]. After synthesis of the MOF, it was suspended in acetone and then mixed with poly(vinylidene fluoride) to produce a miniaturized MIL-101(Fe) mixed-matrix membrane (MOF-MMM).…”

“…Separation of the inorganic As species was carried out at pH 6, followed by direct determination of As(V) on the MOF-MMM by EDXRF measurement, avoiding the elution step. This great benefit can be considered a counterpoint to the drawback of a long equilibrium time (at least 120 min) [ 152 ].…”