A modified ZSM-5 zeolite/Fe₂O₃ composite as a sorbent for magnetic dispersive solid-phase microextraction of cadmium, mercury and lead from urine samples prior to inductively coupled plasma optical emission spectrometry

Abstract

An analytical method in which a zeolite decorated with Fe2O3 magnetic nanoparticles is employed to determine Cd, Hg and Pb in urine samples.

A modified zeolite/iron oxide composite as a sorbent for magnetic dispersive solid-phase extraction for the preconcentration of nonsteroidal anti-inflammatory drugs in water and urine samples

“…Lastly, the composite was dried at 110 ºC overnight.2.5. Modification of ZSM-5/Fe2O3 compositeThe modification of ZSM-5/Fe2O3 composite with HDTMABr surfactant was described in detail in a previous work[49].Briefly, surfactant modification consisted in firstly, stirring g of ZSM-5/Fe2O3 composite with 150 mL of the HDTMABr solution (0.5%, w/v) for 24 h at room temperature. Secondly, HDTMA-modified ZSM-5/Fe2O3 composite (i.e., HDTMA-ZSM-5/Fe2O3) was filtered in a Büchner funnel connected to a vacuum pump and washed with deionized water several times.…”

Determination of four bisphenols in water and urine samples by magnetic dispersive solid‐phase extraction using a modified zeolite/iron oxide composite prior to liquid chromatography diode array detection

“…The synthesis of the ZSM‐5/Fe 2 O 3 composite was carried out following the procedure described in our previous works (see the Supporting Information for further details).…”

“…Zeolites, which are microporous crystalline aluminosilicates, are good MDSPE‐sorbent candidate due to their simple modification to obtain the desired physical properties (i.e., magnetism). Recently, zeolite‐based magnetic composites have been proposed for organic‐compound and metal extraction from environmental, biological, and food samples. Furthermore, the external surface of zeolites can easily be modified with functional groups, thus altering zeolite adsorption properties.…”

Magnetic dispersive solid-phase extraction using a zeolite-based composite for direct electrochemical determination of lead(II) in urine using screen-printed electrodes

“…Namely, 10 g of ZSM-5/Fe2O3 was rinsed three times with 4 M HNO3 and several times with deionized water until neutral pH washing waters were obtained. HNO3 was selected to rinse the composite according to previous publications [21][22][23][24], and considering the easier dissolution of Fe2O3 nanoparticles in HCl solutions. Finally, the composite was dried at 120 ºC for 3 h.…”