Synthesis of novel chitosan resin derivatized with serine diacetic acid moiety and its application to on-line collection/concentration of trace elements and their determination using inductively coupled plasma-atomic emission spectrometry

Abstract

A novel chelating resin functionalized with serine diacetic acid moiety was synthesized by using chitosan as base material, and applied to the collection/concentration of trace elements in environmental water samples, followed by the determination using inductively coupled plasma-atomic emission spectrometer (ICP-AES). The synthesized resin, crosslinked chitosan serine diacetic acid (CCTS-SDA), showed good adsorption behavior toward trace amounts of Cd, Pb, Cu, Ni, V, Ga, Sc, In, and Th in a wide pH range.Additionally, rare earth elements also can be retained on the resin at neutral pH region. The adsorbed elements can be easily eluted with 1 mol L -1 of nitric acid, and their recoveries were found to be 90-100%. The CCTS-SDA was packed in a mini-column, which was then installed in a computer-controlled auto-pretreatment system (Auto-Pret System) for on-linetrace elements collection and determination with ICP-AES. Experimental parameters which related to the improvement of sensitivity and reproducibility were optimized. The limit of detections (LOD) for 13 elements were found to be in sub-ppb level. The proposed method with CCTS-SDA resin was successfully applied to the determination of trace elements in river water samples. The method was validated by determining a certified reference material of river water, SLRS-4.

Diethylenetriamine-functionalized chitosan magnetic nano-based particles for the sorption of rare earth metal ions [Nd(III), Dy(III) and Yb(III)]

“…However, the affinity of the sorbent strongly depends on the intrinsic properties of metal cations (HASB theory): for example, in the case of REEs pristine chitosan has limited sorption capacities, and it is generally necessary to graft new functional groups and/or increase their density at the surface of the sorbent to reach appreciable sorption capacities. Several chelating ligands such as catechol, iminodiacetic acid, iminodimethylphosphonic acid, EDTA and DETPA (and similar functional groups, Elwakeel et al 2009), phenylarsonic acid or serine Hakim et al 2007;Oshita et al 2009;Ren et al 2013;Repo et al 2013;, and amino acid moieties (glycine, valine, leucine and serine) (Oshita et al 2007) were used to functionalize crosslinked chitosan for the sorption of uranium, PGMs, REEs and associated metal ions. Grafting supplementary amino groups onto the chitosan backbone may contribute not only to an increase in the density of sorption sites, but also to the enhancement of sorbent affinity by appropriate steric distribution of reactive groups increasing the number of chelate rings increases the stability of complex formed by polyamine.…”

Determination of rare earth elements in natural water samples – A review of sample separation, preconcentration and direct methodologies

“…Recovery of the REE from the column were quantitative (96 -104%) and with good precision (at worst, 5%). Hakim et al used a fully sutomated system to retain seven REE and other analytes on a column prior to elution of the analytes into an ICP-OES instrument (105). The analytes' peak shapes improved through reversal of the flow during elution.…”

A spectrophotometric assay method for vanadium in biological and environmental samples using 2,4-dinitrophenylhydrazine with imipramine hydrochloride

“…The usual way to determine vanadium content in environmental samples is to use spectrometric methods such as atomic absorption spectrometry (Chakraborty and Das 1994), inductively coupled plasma-mass spectrometry (Noguchi 2008), inductively coupled plasma-atomic emission spectrometry (Danzaki 1992;Osamu Noguchi et al 2009;Hakim et al 2007), inductively coupled plasma-optical emission spectrometry (Wuilloud et al 2000), voltametry (Ensafia and Naderi 1997), high-performance liquid chromatography (Wang et al 1995), spectroflurimetry (Kawakubo et al 1995), ion chromatography inductively coupled plasma-optical emission spectrometry (Coetzee et al 2002), and ETAAS (Saavedra et al 2004). However, these techniques require highly expensive instruments for routine analysis, which every laboratory cannot afford.…”