Anion chromatography with low-conductivity eluents

Gjerde, Douglas T.; Fritz, James S.; Schmuckler, G.

doi:10.1016/s0021-9673(00)95271-3

Cited by 271 publications

(77 citation statements)

References 3 publications

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“…The samples with low levels of ammonium/nitrite in matrices and high concentrations of sodium/chloride are a typical case. Unfortunately, these pairs of ions (NH 4 + /Na + and Cl − /NO 2 − ) have similar selectivities for common stationary phases. The application of ion chromatography for the analysis of waste water with high ion concentrations is given by Singh et al [44].…”

Section: Wastewater Analysis With Ion Chromatographymentioning

confidence: 99%

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Ion Chromatography Applications in Wastewater Analysis

Michalski

2018

Separations

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Wastewater analysis is an important area in analytical and environmental chemistry. It can be performed with both the classic wet methods and instrumental techniques. The development of new methods, and modification of the existing ones, constitute a major task for researchers. Ion chromatography plays a predominant role in ion determinations with the instrumental methods. It offers several advantages over the conventional methods, such as simultaneous determinations of alkali and alkaline earth cations and ammonia. Ammonium ions cannot be determined by spectroscopic methods. Ion chromatography has been accepted world-wide as a reference method for analyzing anions and cations in water and wastewater due to the fact that it enables the replacement of several individual wet chemistry methods for common ions with one instrumental technique. The following article describes the principles of ion chromatography, such as stationary phases, eluents, detectors, and sample preparation methods. Moreover, the applications of ion chromatography in wastewater analyses and international standards are presented.

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Section: Wastewater Analysis With Ion Chromatographymentioning

confidence: 99%

“…It was a significant challenge to determine separated analytes against the background of the eluent ions because the eluent is also an electrolyte. In 1980s, Gjerde et al [4] used the ion chromatography system without the suppression device for the first time. They also used eluents with very low conductivity.…”

Section: Introductionmentioning

confidence: 99%

Ion Chromatography Applications in Wastewater Analysis

Michalski

2018

Separations

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“…It has been reported [1,2] that Jansson's Method [3] can be used to deconvolve severely overlapped gas chromatographic peaks. Initial testing [1,2] indicates the method will give improved performance over conventional graphical peak resolution techniques such as perpendicular drop and shoulder quantitation [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…Initial testing [1,2] indicates the method will give improved performance over conventional graphical peak resolution techniques such as perpendicular drop and shoulder quantitation [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…During the development of this method at NBS, the factors investigated included: composition of the eluents, interference due to impurities in the delivery liquid and the possible means of eliminating them with a laboratory-packed trap column, and a comparison of suppression efficiencies between two types of suppressors. This method was used for the determination of Mg" 2 and Ca" 2 in SRM 2694, Simulated Rainwater, with precisions and accuracies better than 2% relative [5].…”

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Quantification of toxic-chemicals in selected human-populations

Holler¹,

Patterson²,

Smith³

1988

J. RES. NATL. BUR. STAN.

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the pg/mL range with in-line preconcentration [5]. During the development of this method at NBS, the factors investigated included: composition of the eluents, interference due to impurities in the delivery liquid and the possible means of eliminating them with a laboratory-packed trap column, and a comparison of suppression efficiencies between two types of suppressors. This method was used for the determination of Mg" 2 and Ca" 2 in SRM 2694, Simulated Rainwater, with precisions and accuracies better than 2% relative [5].The frontier for ion chromatography is transition metal analysis with ongoing research along many fronts. New resins are being introduced and are being coupled to exotic detectors. The era of "hyphenated" techniques is burgeoning with ion chromatography showing up as the front-end separation method of choice. Recent work at NBS has coupled ion chromatography with direct current plasma emission spectrometry for the determination of phosphorus in copper-based alloys [6].Future challenges for ion chromatography will be to enhance further its capabilities through improved speed, sensitivity, and resolution. Speciation of metals as a function of oxidation state and complexation will be an important goal. Innovative resins and a new generation of detectors will have to be developed. Fundamental research into the retention mechanisms leading to the separation will be essential.In conclusion, ion chromatography has proven itself an invaluable tool to analytical chemistry. Its ultimate advantages will lie in its versatility and its capacity for ultra-trace analyses with minimal contamination and total automation.

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Effect of ion binding on protein transport through ultrafiltration membranes

Menon

Zydney

1999

Biotech & Bioengineering

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Electrostatic interactions can have a significant impact on protein transmission through semipermeable membranes. Experimental data for the transport of bovine serum albumin (BSA) through a polyethersulfone ultrafiltration membrane were obtained in different salt solutions over a range of pH and salt concentrations. Net BSA charge under the same conditions was evaluated from mobility data measured by capillary electrophoresis. The results show that specific ionic composition, in addition to solution pH and ionic strength, can strongly affect the rate of protein transport through semipermeable ultrafiltration membranes. The effects of different ions on BSA sieving are due primarily to differences in ion binding to the protein, which leads to significant differences in the net protein charge at a given pH and ionic strength. This effect could be described in terms of an effective protein radius, which accounts for the electrostatic exclusion of the charged protein from the membrane pores. These results provide important insights into the nature of the electrostatic interactions in membrane systems. © 1999 John Wiley & Sons, Inc. Biotechnol Bioeng 63: 298–307, 1999.

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Anion chromatography with low-conductivity eluents

Cited by 271 publications

References 3 publications

Ion Chromatography Applications in Wastewater Analysis

Ion Chromatography Applications in Wastewater Analysis

Quantification of toxic-chemicals in selected human-populations

Effect of ion binding on protein transport through ultrafiltration membranes

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