Tris(2-aminoethyl) amine functionalized silica gel for solid-phase extraction and preconcentration of Cr(III), Cd(II) and Pb(II) from waters

Polyurethane composite adsorbent using solid phase extraction method for preconcentration of metal ion from aqueous solution

“…9. The obtained LOD and LOQ are comparable with some reported studies (Ensafi et al 2003;Otero-Romani et al 2005;Huang et al 2008;Sharma and Pant 2009).…”

“…Numerous preconcentration and separation techniques application have been reported for metal-ion analysis, which include cloud-point extraction (CPE) (Anthemidis et al 2001(Anthemidis et al , 2002, co-precipitation (Duran et al 2009), electrochemical deposition (ECD) (Soylak and Tuzen 2008), flotation (Pan et al 2007), liquid-liquid extraction (LLE) (Candir et al 2008), solid-phase extraction (SPE) (Otero-Romani et al 2005;Elci et al 2008;Huang et al 2008;Chen et al 2009), solid-phase microextraction (SPME) (Camel 2003;Chen et al 2009), etc. However, SPE is the preferred method mainly due to its simplicity, direct application in microlitre (lL) volume, speed, minimal sample loss, higher preconcentration factor, rapid phase separation, cost and time saving (Bulut and Tez 2007;Chen et al 2009;Mohammadi et al 2011).…”

Preparation of new types of anion exchange resins from agricultural by-products and their utilization in the removal of various toxic anions from solutions

“…As expected, a significant reduction in the intensity of OH and C-H peaks at 3336-3380 and 2856-2906 cm −1 are recorded in the spectrum of WR anion exchange resins. Appearance of peak around 1371 cm −1 was assigned to C-N stretching vibration, which corresponds to the amine groups in the framework of these resins [26]. The band at 1415 cm −1 corresponds to −NH deformation vibration in -NH 2 .…”

New Approach to Synthesis of Silica with Chemically Bound Guanidine Hydrochloride for Preconcentration of Metal Ions

“…Initial solutions with concentration of 1 mg/ml were prepared by dissolving of precise sample weights of the Analar grade salts (NH 4 [12]. Working solutions were prepared from the initial ones immediately before experiments.…”