Synthesis of cross-linked chitosan functionalized with threonine moiety and its application to on-line collection/concentration and determination of Mo, V and Cu

Abstract

A novel chitosan-based resin functionalized with threonine moiety was synthesized, and applied to the collection/concentration of Mo, V, and Cu in environmental water samples, followed by their determination using inductively coupled plasma-atomic emission spectrometer (ICP-AES). The synthesized resin, crosslinked chitosan-threonine (CCTS-Thr), showed good adsorption behavior toward trace amounts of Mo, V, and Cu in a wide pH range.The adsorbed elements can be easily eluted using 2 mol L -1 of nitric acid, and their recoveries were found to be 90-100%. The CCTS-Thr was packed in a mini-column, which was then installed in a computer-controlled auto-pretreatment system (Auto-Pret System) for on-line trace-elements collection and determination by ICP-AES. Experimental parameters related to the improvement of sensitivity and reproducibility were optimized. The limits of detection (LODs) for target metals were found to be in sub-ppb level. The proposed method with L. Hakim et al. CCTS-Thr resin was successfully applied to the determination of Mo, V, and Cu in environmental water samples. The recovery test showed that common matrices which exist in environmental water samples did not interfere with the determination.

Development of an on-line temperature-assisted ionic liquid dispersive microextraction system for sensitive determination of vanadium in environmental and biological samples

“…Vanadium concentrations in river water samples were in the range of 0.60-1.12 g L −1 and in tap water were in the range of 0.18-0.48 g L −1 . Results were not significantly different to those reported previously in river and tap water samples [26]. Additionally, the accuracy of the proposed methodology was evaluated by analyzing a certified reference material (CRM) of natural water NIST SRM 1643e, with a vanadium content of 37.86 ± 0.59 g L −1 .…”

“…Acetone was acidified with nitric acid in order to induce dissociation of V-Br-PADAP complex and further releasing of vanadium into solution. Additionally, best results were obtained when the elution of the analyte was developed in countercurrent through the microcolumn, which was especially favourable in order to obtain a more efficient elution by minimizing the analyte dispersion [26].…”

Development of Metal-Isolable Polymer-Gel Sorbent for Mutual Separation of Ti, V, Zr, Nb, Mo, Ta, and W

“…This result proved that about 0.27 mmol of DFB per 1g polymer gel was chemically modified. The equilibrium adsorption capacity of DFB gel is in no way inferior to that of the typical chelating resin 19) . An evaluation on the polymer gel, which chemically fixed DFB, was conducted.…”

Chitin Research Revisited

“…Chitin phosphate could absorb uranium in the presence of sodium carbonate solution [187]. Chitosan-based chelating resins have been developed to absorb mercury [190], Ti (IV), V (V), Mo (VI) [191], W (VI), U (VI) [192], Ag in aquatic environment [193], Cd, Ni, V, Ga, Sc, In, and Th [194]. Chitin and chitosan have been shown to have copper removal capability, which could help to obtain more stable diesel oil [195].…”