Separation and determination of lead in human urine and water samples based on thiol functionalized mesoporous silica nanoparticles packed on cartridges by micro column fast micro solid-phase extraction

Abstract

An efficient method based on thiol functionalized mesoporous silica nanoparticles (HS-MSNPs) was used for extraction of lead ions (PbII) from urine and water samples by packed column micro solid phase extraction (PC-MSPE). By procedure, 15 mg of HS-MSNPs packed in syringe cartridges (SC, 5 mL) with cellulose membrane and pH adjusting at 5.5-6.5. Then, the lead of urine and water sample was efficiently extracted on HS-MSNPs after pushing the plunger of a syringe. Finally, the Pb (II) was back-extracted with inorganic acid solution and the remained solution determined by electrothermal atomic absorption spectrometry (ET-AAS). By optimization conditions, the enrichment factor, LOD, linear range and RSD% was obtained 24.8, 0.04 μg L-1, 0.12-5.5 μg L-1 and less than 5%, respectively for 5 mL of urine samples. The validation was confirmed by spiking of real samples and using certified reference material (CRM, NIST) in water and urine sample.

Adsorption of diazinon using Cd-MOF nanoparticles before determination by UV-Vis spectrometer: isotherm, kinetic and thermodynamic study

“…For determining percentages of removal various methods such as simulation, spectroscopy, and chromatography have been used [14,15]. Various materials such as multi-walled carbon nanotubes [16], activated carbon [17], bismuth oxide-fullerene nanoparticles [18], mesoporous silica [19] and , metal-organic frameworks [20] and other porous materials [21] have been used as adsorbents. Metal-organic framework, which is composed of metal ions or clusters of organic linkers, are crystalline materials that have a variety of applications in the removal of contaminants [22] drug delivery [23], catalysis [24] separation [19], electronic devices [25] gas storage [26], and sensors [27].…”

“…Various materials such as multi-walled carbon nanotubes [16], activated carbon [17], bismuth oxide-fullerene nanoparticles [18], mesoporous silica [19] and , metal-organic frameworks [20] and other porous materials [21] have been used as adsorbents. Metal-organic framework, which is composed of metal ions or clusters of organic linkers, are crystalline materials that have a variety of applications in the removal of contaminants [22] drug delivery [23], catalysis [24] separation [19], electronic devices [25] gas storage [26], and sensors [27]. Due to the adjustable porosity, high surface area, adsorptive properties, and variety of structures MOFs are effective agents for the removal of pesticides from water.…”

A novel method based on functionalized bimodal mesoporous silica nanoparticles for efficient removal of lead aerosols pollution from air by solid-liquid gas-phase extraction

“…The sample preparation of metals in liquid phase flowed by liquid-liquid extraction (LLE), but in air/gas, sorbents as a solid phase was used for removal of metals or other materials. In liquid phase, solid phase extraction (SPE) was selected as a favorite technique for removal of heavy metals or volatile organic compounds (VOCs) [17,18]. In optimized conditions by SPE, the appropriate sorbent is an important factor for efficient extraction and recovery.…”