Determination of selenium in enteral formulas and urine samples by graphite-furnace AAS.

Chelating Materials Immobilizing Carboxymethylated Pentaethylenehexamine and Polyethyleneimine as Ligands

“…The potential of Presep ® PolyChelate, on which CM-PEI is immobilized as a functional group, was compared to those of the other commercially available chelating resins, including Nobias Chelate-PA1, [28][29][30][31][32][33][34][35][36][37][38] 27 The extraction capacities for Cu was 0.30 mmol g -1 for Presep ® PolyChelate; this value was 2 times larger than that for Nobias Chelate-PA1, whereas it was smaller than those for the other chelating resins. In the investigation of the effect of pH on the recoveries of 21 kinds of elements, Fig.…”

“…28-38 Such performance is desirable for the analyses of real samples, which contain large amounts of alkaline earth elements; this resin has been applied for the separation and preconcentration of some elements in environmental [28][29][30][31][32][33][34][35][36] and biological 37,38 samples. We have studied the usefulness of polymer/oligomer ligands for the separation and preconcentration of elements and have found that α-pyridylamino oligomer 39 and polythioamides [40][41][42] showed interesting performance, indicating that polymer/ oligomer ligands have the possibility of improving selectivity and efficiency in the extraction of elements.…”

Potential of Presep® PolyChelate as a Chelating Resin: Comparative Study with Some Aminocarboxylic Acid-type Resins

“…Nobias Chelate-PA1 [19][20][21][22][23][24][25][26][27][28][29] has both IDA and ethylenediaminetriacetic acid (EDTriA) as functional groups. This resin is able to extract various elements simultaneously over a wide pH range, and Mg and Ca are captured in only small amounts at pH levels below 7.…”

“…Such performance of this resin is highly attractive for analyses of real samples containing large amounts of Mg and Ca. Solid-phase extraction using this resin has been applied to separating and preconcentrating trace elements in various samples, including seawater, [19][20][21][22][23][24][27][28][29] river water, 19 salt, 28 bone, 25 blood, 25 and urine. 26 Recently, Presep ® PolyChelate has also become commercially available.…”

Determination of Molybdate in Environmental Water by Ion Chromatography Coupled with a Preconcentration Method Employing a Selective Chelating Resin

“…Notes was used to determine the metal elements in seawater. 13 Kagaya's group also developed a chelating resin that immobilizes a soft ligand.…”