Solid Phase Extraction and Determination of Trace Amounts of Lead(II) Using Octadecyl Membrane Disks Modified by a New Schiff's Base and Flame Atomic Absorption Spectrometry

Abstract

A highly selective, facile and reliable method for separation and preconcentration of the trace amounts of lead present in aqueous samples is introduced. By passing the solutions through an octadecyl silica membrane disk modified by a novel Schiff's base, Pb 2+ ions are adsorbed quantitatively while almost all interfering ions pass through the disk. The retained lead(II) ions are then eluted from the disk surface by a minimal amount of organic eluents. The influences of pH, sample flow-rates and interfering ions are also investigated. The proposed method permits an enrichment factor of about 500 or higher and a detection limit of 0.0065 ng mL -1 .

All-Solid-State Separated Potassium Electrode Based on SnO[sub 2]/ITO Glass

“…In most cases, the influence to the pH values was affected by the metal hydroxide formation at the alkali side and the hydrogen ion at the acid side. [26][27][28][29] However, the phenomenon of becoming a large value in high acid value or alkali value is not observed in this study.…”

Preconcentration of Pb(II), Cr(III), Cu(II), Ni(II) and Cd(II) ions in environmental samples by membrane filtration prior to their flame atomic absorption spectrometric determinations

“…The detection limits and preconcentration factor of analyte ions are superior to those of preconcentration technique for analyses [23][24][25][26][27]. The matrix effects with the method were reasonably tolerable by the comparison some other preconcentration techniques in literature [28][29][30][31][32][33][34][35]. The recoveries were quantitative (93-100%).…”

Solid Phase Extraction of Ultra Trace Copper Using Octadecyl Silica Bonded Phase Membrane Disks Modified by a New Symmetric Schiff Base Ionophore Prior to FAAS Determination

“…The C 18 disks possess numerous advantages which are predominately i) shorter sample processing time, ii) decreased plugging, iii) more density, iv) uniformity of packing, v) reduced channeling, vi) easiness of automation and vii) possibility of on-line coupling to other analytical techniques [11,29]. In recent years, modified OSPM disks have been successfully used for the pre-concentration and separation of the trace amounts of lead [30,31], copper [32][33][34][35][36], Cr [37,38], Ag [39] and different organic compounds from environmental matrices [40]. To the best of our knowledge, no attempts have been made for selective enrichment of very low levels of copper in different complex matrices using OSPM disks impregnated with N,N -ethylene-bis-(3-formyl-5-methyl salicyl aldymine) (EFMA) donating Schiff base ( Fig.…”