Chelation ion chromatography as a method for trace elemental analysis in complex environmental and biological samples

Abstract

The development and evaluation of a new method for the determination of trace transition and rare-earth elements based on the combination of chelation and ion chromatography are described. The new method, chelation ion chromatography (Chelation IC), uses a chelating column to concentrate and separate transition and rare-earth elements from the common alkali and alkaline-earth metals, as well as other matrix components, prior to analysis by ion chromatography. The sample fraction from the chelating column contains only the concentrated analyte ions, thus eliminating interfering matrix components from complex matrices such as seawater and digested biological, botanical, and geological materials. This combination of chelation and ion chromatography provides a technique that makes possible the determination of trace elements in complex matrices that have proven to be difficult or impossible to analyze by ion chromatography or conventional atomic spectroscopy techniques.

Advanced Fine Particulate Characterization Methods

“…The mobile phase employed in both methods is based on the formation of anion complexes with pyridine-2-6-dicarboxylic acid. 12,[17][18][19] Because of higher sensitivity, the derivatization with spectrophotometric postcolumn reagents allowing for the UV-Vis detection was employed.…”

“…17 Noticeable on this method is the capability to distinguish divalent and trivalent iron. The detection limit achieved with this method was 100 ppb (using a 250-µL loop) for all metals except lead, which was detected at concentrations above 500 ppb.…”

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

“…A drawback of this method is that the detection limits of molybdate is in the sub-ppm range. 9 An iminodiacetic acid (IDA) chelating resin was used for IC determination of transition and rare-earth elements in complex matrices. 10 Recently, Sakamoto and coworkers developed a chelating resin that immobilizes both IDA and diethylenetriamine-triacetic acid (DTTA) and that can form EDTA-like complexes.…”

Preconcentration and Determination of Trace Amounts of Heavy Metals in Water Samples Using Membrane Disk and Flame Atomic Absorption Spectrometry

“…These include liquid-liquid extraction (LLE), [1][2][3] coprecipitation, 4 resin chelation, 5 electrochemical deposition, 6 and solid phase extraction (SPE). 7,8,29 Much interest has been shown in replacing conventional LLE for isolating environmental pollutants with SPE technique, recently. 10,22 SPE consists of bringing a test solution in contact with a solid phase or sorbent, whereby the analysis is selectively adsorbed onto the surface of the solid phase.…”