Application of chitosan functionalized with 3,4-dihydroxy benzoic acid moiety for on-line preconcentration and determination of trace elements in water samples

• Published in: Mikrochimica acta (1966) Vol. 159; no. 3-4; pp. 341 - 348
• Main Authors: SABARUDIN, Akhmad, NOGUCHI, Osamu, OSHIMA, Mitsuko, HIGUCHI, Keiro, MOTOMIZU, Shoji
• Format: Journal Article
• Language: English
• Published: Wien Springer 01-07-2007; New York, NY
• Subjects: Analytical chemistry; Applied sciences; Chemistry; Exact sciences and technology; Global environmental pollution; Pollution; Spectrometric and optical methods; Benzoic acid; Gallium; 3,4-dihydroxy benzoic acid; Atomic emission spectrometry; Vanadium; Metal ion; Inductive coupling plasma spectrometry; Chemical enrichment; Uranium; Efficiency; Detection limit; Bismuth; Copper; on-line preconcentration; Quantitative analysis; Seawater; Direct injection; Flow injection; ICP-AES; Elution; chitosan resin; Indium; Certified reference material; Molybdenum; Nitric acid; Alkaline earth metal ion; Silver; Trace element; Sensitivity; Adsorption; Environment; Nickel; Chitosan; River water; Nebulizer
• DOI: 10.1007/s00604-007-0734-y
• EISSN: 1436-5073
• ISSN: 0026-3672

Chitosan resin functionalized with 3,4-dihydroxy benzoic acid (CCTS-DHBA resin) was used as a packing material for flow injection (FI) on-line mini-column preconcentration in combination with inductively coupled plasma-atomic emission spectrometry (ICP-AES) for the determination of trace elements such as silver, bismuth, copper, gallium, indium, molybdenum, nickel, uranium, and vanadium in environmental waters. A 5-mL allquot of sample (pH 5.5) was introduced to the minicolumn for the adsorptlon/preconcentration of the metal ions, and the collected analytes on the mini-column were eluted with 2M HNO sub(3), and the eluates was subsequently transported via direct injection to the nebulizer of ICP-AES for quantification. The parameters affecting on the sensitivity, such as sample pH, sample flow rate, eluent concentration, and eluent flow rate, were carefully examined. Alkali and alkaline earth metal ions commonly existing in river water and seawater did not affect the analysis of metals. Under the optimum conditions, the method allowed the determination of metal ions with detection limits of 0.08 ng mL super(-1)(Ag), 0.9 ng mL super(-1) (Bi), 0.07 ng mL super(-1) (Cu), 0.9 ng mL super(-1) (Ga), 0.9 ng mL super(-1) (In), 0.08ng mL super(-1) (Mo), 0.09 ng mL super(-1) (Ni), 0.9 ng mL super(-1)(U), and 0.08 ng mL super(-1) (V). By using 5mL of sample solution, the enrichment factor and collection efficiency were 8-12 fold and 96-102%, respectively, whereas the sample throughput was 7 samples/hour. The method was validated by determining metal ions in certified reference material of river water (SLRS-4) and nearshore seawater (CASS-4), and its applicability was further demonstrated to river water and seawater samples.