Unmodified Multi-Walled Carbon Nanotubes as Sorbent Material in Flow Injection on-Line Sorbent Extraction Preconcentration System for Cadmium Determination by Flame Atomic Absorption Spectrometry

Multiwalled carbon nanotubes as solid sorbent in dispersive micro solid-phase extraction for the sequential determination of cadmium and lead in water samples

“…Multiwalled carbon nanotubes (MWCNTs) have been used as sorbent material in flow injection on-line microcolum preconcentration coupled with flame atomic absorption spectrometry for determination of Cd and Cu [12], Cd [13,14], Pb [15] as well as Cu, Zn, Mn and Pb [16]. MWCNTs can be used as solid phase extractors for metal ions in the form of chelate complexes [17][18][19][20].…”

Multi-Element Analysis Based on an Automated On-Line Microcolumn Separation/Preconcentration System Using a Novel Sol-Gel Thiocyanatopropyl-Functionalized Silica Sorbent Prior to ICP-AES for Environmental Water Samples

“…Unequivocally, over the past few years, attention has been directed toward the development and evaluation of novel sorptive phases for on-line systems aiming to develop automated methods characterized by high accuracy and sensitivity. In this frame, a variety of sorbents have arisen including carbon nanotubes [ 16 ], metal oxides [ 17 ], 3D-printed materials [ 18 ], and functionalized silicas [ 19 ]. Among them, silica-based materials appear to be an excellent choice of support to develop sorptive phases for the extraction of metal ions.…”

Automatic On-line Solid-phase Extraction-Electrothermal Atomic Absorption Spectrometry Exploiting Sequential Injection Analysis for Trace Vanadium, Cadmium and Lead Determination in Human Urine Samples

“…6 In this context, sequential injection (SI) analysis is a well-established automatedpretreatment (Auto-Pret) platform, offering great advantages in the automation and miniaturization of the analytical methods. [7][8][9][10][11] Over the last few decades, research in the field of solid phase extraction has focused on the synthesis and study of new sorbent materials with improved characteristics, 12 like co-polymeric beads Oasis HLB, 13,14 carbon nanotubes, [15][16][17] magnetic particles, 6,18 lysine-modified mesoporous silica (Fmoc-SBA-15), 19 polytetrafluoroethylene (PTFE), 20 polyether-etherketone (PEEK), 21 since the selection of the appropriate one is of prime importance for the sensitivity and selectivity of an analytical method. Nobias chelate PA-1, first introduced by Sakamoto et al 22 and Yamamoto et al, 23 is a chelating adsorbent consisting of a hydrophilic methacrylate polymer backbone, which is chemically modified by amino and carboxylic groups.…”