Synthesis of Chitosan-Based Resins Functionalized with Serine Moiety and Its Application to Determination of Trace Amounts of Uranium by FI/ICP-MS System

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Abstract

Cross-linked chitosan resins possessing serine moiety (serine-type chitosan resins) were synthesized for the collection of trace uranium and the separation of matrices in seawater prior to ICP-MS measurement. The serine moiety has a carboxyl group and an amino group at the β-carbon position of ethanol. The adsorption behavior of trace elements on two types of chitosan resin, coupled with the hydroxyl group of serine (type 1) and with the amino group of serine (type 2), was investigated by using a proposed column procedure. The serine-type chitosan resin (type 1) adsorbed U(VI) over wide pH regions from 2 – 9, and especially could collect U(VI) at acidic pH regions selectively by forming stable chelate with the amino group and the carboxyl group of the serine moiety introduced to chitosan. Further, the flow injection/ICP-MS system was developed for the determination of trace uranium in seawater using a small column packed with the resin. The proposed system could be applied to the uranium analysis.

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