Uses of 5-Methylresorcin-bonded polyurethan foam as a new solid phase extractor for the selective separation of mercury ions from natural water samples

Abstract

Abstract:In this work, 5-Methylresorcin (MR) bonded to untreated polyurethane foam (PUF) was successfully employed as a sorbent (MR-PUF) for the selective separation and determination of mercury in natural water samples. Mercury can be quantitatively recovered in the pH range of 5-7. The system presented a minicolumn packed with the new sorbent, where the sample solution was passed through it for a period of time and an eluent solution stripped out the retained mercury, which was further determined with dithizone. The new matrix was characterized by using different tools (IR spectra, stability and density). The kinetics of mercury uptake by the new matrix was found to be fast, reaching equilibrium in 20 minutes. A preconcentration factor of 350 was achieved. The proposed preconcentration procedure was applied successfully to the selective separation and determination of trace mercury in natural water samples.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

Thermodynamics and Kinetics of Heavy Metals Adsorption on Silica Particles Chemically Modified by Conjugated β-Ketoenol Furan

“…19 An important trend in the development of adsorbent is changing the traditional supports by physical or chemical treatments to produce new and more versatile materials with low-priced and well-defined characteristics. 20,21 Different solid phases have been applied in SPE, such as active carbon, 22 silica particles, 23 microcrystalline naphthalene, 24 Amberlite XAD resin, 25 polyurethane foam, 26 and alumina. 27 Nevertheless, silica particles have gained importance in the SPE technique because of their high porosity, good mechanical and thermal stability, lower susceptibility to swelling and shrinking, and their easiness of surface modification.…”

“…Different solid phases have been applied in SPE, such as active carbon, silica particles, microcrystalline naphthalene, Amberlite XAD resin, polyurethane foam, and alumina . Nevertheless, silica particles have gained importance in the SPE technique because of their high porosity, good mechanical and thermal stability, lower susceptibility to swelling and shrinking, and their easiness of surface modification.…”

Flow injection analysis–solid phase extraction (FIA–SPE) method for preconcentration and determination of trace amounts of penicillins using methylene blue grafted polyurethane foam

“…The use of PUF in flow injection preconcentration systems is advantageous because it shows low resistance to passage of fluids, no overpressure or swelling, and very suitable for packing the columns [35]. Unloaded PUF could be used to extract polar or nonpolar molecules [36], or after physical or chemical immobilization of chelating agents [37]. Furthermore, organic compounds such as polychlorinated biphenyls, organochlorines, polyaromatic hydrocarbons, organic insecticides, and carbaryl have been concentrated on PUF [38].…”

Selective separation and preconcentration of copper (II) in environmental samples by the solid phase extraction on multi-walled carbon nanotubes

“…Solid phase extraction of heavy metal ions from aqueous solutions are preferentially used as compared to other preconcentration techniques, mainly due to its simplicity, low cost, contaminant free and adaptation to flow injection techniques [31][32][33][34][35][36]. Various adsorbents like solvent-impregnated resins, polyurethane foam, Amberlite resins, agar, modified clinoptilolite zeolite etc.…”