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New chelating resins immobilizing carboxymethylated polyallylamine (CM-PAA) were prepared by immobilizing PAAs with some molecular weights on methacrylate resins and then carboxymethylating a part of amino groups in the PAAs using various amounts of sodium monochloroacetate. The molecular weight of PAA barely affected both the amount of PAA immobilized on the resin and the relationship between the carboxymethylation (CM) rate and the ratio of the amount of monochloroacetate used in the CM step. The selectivity of CM-PAA resin for solid-phase extraction of trace elements was almost the same as that of a resin immobilizing carboxylymethylated polyethyleneimine; 10 elements, namely Cd, Co, Cu, Fe, Mo, Ni, Pb, Ti, V, and Zn, could be quantitatively recovered over a wide pH range and alkali and alkaline earth elements were scarcely extracted under acidic and neutral conditions. The CM-PAA resin was applicable to the separation and preconcentration of the elements in a certified reference material (Waste Water, EU-L-1) and a real environmental water sample (ground water). Keywords Chelating resin immobilizing carboxymethylated polyallylamine; solid-phase extraction; trace element; selectivity; environmental water sample acid, namely NOBIAS Chelate PA-1 (Hitachi High-Tech Fielding), 5-19 InertSep ME-2 (GL Science), 20 and Presep PolyChelate (FUJIFILM Wako Pure Chemical), 5,13,21-28 have been developed and the application of these resins for solid-phase extraction of trace elements in environmental samples has recently increased. These resins scarcely extract alkali and alkaline earth elements, which are sometimes contained at high concentration in various environmental samples and are often interfered with the determination of trace elements using atomic spectroscopy, under acidic and neutral conditions. 5,20 The selectivity of such chelating resins has been studied using chelating resins immobilizing Analytical Sciences