このエントリーをはてなブックマークに追加
ID 33025
FullText URL
Author
Sabarudin, Akhmad
Oshima, Mitsuko
Noguchi, Osamu
Motomizu, Shoji
Abstract

A chitosan resin functionalized with 3-nitro-4-amino benzoic acid moiety (CCTS-NABA resin) was newly synthesized for the collection/concentration of trace molybdenum by using cross-linked chitosan (CCTS) as base material. The carboxyl group of the moiety was chemically attached to amino group of cross-linked chitosan through amide bond formation. The adsorption behavior of molybdenum as well as other 60 elements on the resin was examined by passing the sample solutions through a mini-column packed with the resin. After the elution of the elements collected on the resin with 1 M HNO3, the eluates were analyzed by inductively coupled plasma-mass spectrometry (ICP-MS) and atomic emission spectrometry (ICP-AES).
The CCTS-NABA resin can adsorb several metal ions, such as vanadium, gallium, arsenic, selenium, silver, bismuth, thorium, tungsten, tin, tellurium, copper, and molybdenum at appropriate pHs. Among these metal ions, only molybdenum could be adsorbed almost completely on the resin at acidic regions. An excellent selectivity toward molybdenum could be obtained at pH 3-4. The adsorption capacity of CCTS-NABA resin for Mo(VI) was 380 mg g(-1) resin. Through the column pretreatment, alkali and alkaline earth metals in river water and seawater samples were successfully removed.
The CCTS-NABA resin was applied to the adsorption/collection of molybdenum in river water and seawater samples. The concentrations of molybdenum in river water samples were found in the range of 0.84 and 0.95 ppb (ng g(-1)), whereas molybdenum in seawater was about 9 ppb. The validation of the proposed method was carried out by determining molybdenum in the certified reference materials of SLRS-4, CASS-4, and NASS-5 after passing through the CCTS-NABA resin; the results showed good agreement with the certified-values.

Keywords
chitosan resin
3-nitro-4-amino benzoic acid
molybdenum
adsorption behavior
water and seawater
ICP-MS
ICP-AES
certified reference materials
Note
Published with permission from the copyright holder.
This is published in Talanta, 2007 Vol.73 Issue.5 pp.831-837
Publisher URL: http://dx.doi.org/10.1016/j.talanta.2007.04.057
Direct access to Thomson Web of Science record
(C)2007 by Elsevier B.V.
Published Date
2007-05-22
Publication Title
Talanta
Volume
volume73
Issue
issue5
Start Page
831
End Page
837
Content Type
Journal Article
language
英語
Refereed
True
DOI
Web of Sience KeyUT
Submission Path
analytical_chemistry/37