A new approach to dealing with high-to-low concentration ratios of sodium and ammonium ions in ion chromatography

Rey, María; Pohl, Christopher A.; Jagodziński, Jacek; Kaiser, Edward; Riviello, John

doi:10.1016/s0021-9673(97)01271-5

Cited by 55 publications

(16 citation statements)

References 9 publications

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“…To achieve the same effect in a more elegant way, the ionexchange polymer can be functionalized with crown ethers. (7), 5 mg L -1 calcium (8), and 15 mg L -1 cyclohexylamine (9) A stationary phase of this type is the IonPac CS15 [35]. The characteristic structural properties of this column are identical to those of the IonPac CS12A.…”

Section: Polymer-based Cation Exchangersmentioning

confidence: 99%

Modern stationary phases for ion chromatography

Weiss¹,

Jensen²

2003

Anal Bioanal Chem

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Due to the better understanding of the processes taking place at the surface of the stationary phases, the number of ion-exchange materials for ion chromatography (IC) has increased tremendously over recent years. As a result, the multitude of commercially available columns today with their different selectivities for anion and cation chromatography is almost confusing. Hence, the aim of this article is to describe the different principles determining selectivity and ion-exchange capacity and to classify the various ion-exchange materials accordingly. To ensure a fair comparison of these columns, the selectivity differences are illustrated by showing separations of standards rather than individual samples. Keywords Ion chromatography · Stationary phases · Support materials · Inorganic anions and cations · Organic anions and cations Anion exchangersPolymer-based anion exchangers Styrene/divinylbenzene copolymers, polymethacrylate, and polyvinyl resins are the most important organic polymers that are used as substrate materials in the manufacturing process for polymer-based anion exchangers.

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Section: Polymer-based Cation Exchangersmentioning

confidence: 99%

Modern stationary phases for ion chromatography

Weiss¹,

Jensen²

2003

Anal Bioanal Chem

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“…As an example, advances in column design led to the marketing of dedicated columns, namely IonPac CS12, CS15 [14], and CS16 [15], of high capacity (2.8 meq for 4 mm 9 250 mm CS12 and CS15 columns and 8.4 meq for 5 mm 9 250 mm CS16 column) and incorporating carboxyl groups as cation-exchange sites. Among the columns listed above, IonPac CS15, besides carboxylic functionality contains phosphonic and crown ether groups that enhance selectivity among adjacent peaks [16], through the complexation of cations, with complexation being largely dependent on the size of the hydrophilic cavity of the crown ether in relation to the ionic radius of the analytes. Saari-Nordhaus and Anderson [17] showed that by use of two different columns connected in series (Fig.…”

Section: Inorganic Cations and Ammoniamentioning

confidence: 99%

The Challenging Role of Chromatography in Environmental Problems

2011

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This review details the contribution of ion chromatography (IC) to environmental analysis. With reference to the problems usually encountered in environmental analysis (low concentrations to be detected and matrix interference), applications of IC in the analysis of inorganic cations in water and in the analysis of the platinum group elements (PGEs) in air particulate matter, and the advantages of this technique over more traditionally accepted analytical techniques will be discussed. Other current environmental topics, for example the occurrence of haloacetic acids (HAAs) in drinking water, will be covered, highlighting the importance of IC as an emerging powerful tool for monitoring HAAs, recognized also by the EPA that recently adopted it in a regulated method (Method 557).

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“…Although a large retention time difference between Na + and NH þ 4 is achieved, thus allowing the detection of these cations in disproportionate ratios, this approach has the drawbacks of the use of two analytical columns and the need for a columnswitching valve. To address these limitations, a new column has been synthesized (IonPac CS15 [7]) that exhibits enhanced selectivity through its carboxylic/phosphonic/ crown ether functional groups.…”

Section: Introductionmentioning

confidence: 99%

“…The study was performed using a cation-exchange column (IonPac CS12A-5 lm) and different mobile phase compositions containing methanesulphonic acid (MSA). Since macrocyclic ligands when used either as components in the stationary [6,7,13] or in the mobile [14 -19] phase have been recognized as selective in binding specific cations, 18-crown-6 ether was added in the mobile phase.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous determination of alkali, alkaline earths and ammonium in natural waters by ion chromatography

Bruzzoniti

Carlo

Fungi

2008

J of Separation Science

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An ion chromatographic method has been developed for the determination of alkali (Li + , Na + , K + ), alkaline earths (Ca 2+ , Mg 2+ , Ba 2+ , Sr 2+ ) and ammonium ion in waters. The usual difficulties encountered during traditional cation-exchange separations (incomplete resolution for Na + and NH 4 + present in disproportionate concentration ratios) have been overcome tuning the selectivity of the separation by the introduction of 18-crown-6 ether in the mobile phase using an IonPac CS12A (15063 mm id) column. After a detailed study of the effect of mobile phase components on separation, a gradient elution from 26 mM methanesulphonic acid (MSA) with a step change at 9 min to 60 mM MSA (0.5 mM 18-crown-6) provided the required baseline separation for the eight selected analytes. The method developed provides the advantage of the determination, in the same analytical run, also of strontium and barium, which is usually performed by spectroscopic techniques. Within-day and between-day repeatability have been assessed, observing between-day RSD included between 0.3 and 1.8% for retention times and 0.6 and 7.2% for peak areas. The method has been finally tested for the analysis of water samples of different provenience (well, tanks, water system) and results compared with those obtained by the laboratory in charge of the control of drinking water for the city of Torino (Italy).

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A new approach to dealing with high-to-low concentration ratios of sodium and ammonium ions in ion chromatography

Cited by 55 publications

References 9 publications

Modern stationary phases for ion chromatography

Modern stationary phases for ion chromatography

The Challenging Role of Chromatography in Environmental Problems

Simultaneous determination of alkali, alkaline earths and ammonium in natural waters by ion chromatography

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