High-capacity cation-exchange column for enhanced resolution of adjacent peaks of cations in ion chromatography

Rey, María

doi:10.1016/s0021-9673(01)00638-0

Cited by 35 publications

(16 citation statements)

References 5 publications

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“…As it would take more than 60 min to elute Mg 2+ from the ion‐exchange column, the potassium salt is suggested be a good candidate for the supporting electrolyte in ammonia synthesis experiments if the IC is employed as the quantification method. Further, lithium or sodium salts also can be used as the supporting electrolyte since trace NH 4 + can be quantified in ultrahigh sodium background conditions (even Na + /NH 4 + =50 000:1), such as industrial water, sodium bicarbonate, and brine, by employing the gradient elution system, high‐exchange‐capacity column,– or capillary column . Some chromatograms and analysis conditions for trace NH 4 + quantification under ultrahigh sodium background were shown in Figure S5 and Table S4, respectively.…”

Section: Validation and Robustness Of The Ic Methodsmentioning

confidence: 99%

Improving the Reliability and Accuracy of Ammonia Quantification in Electro‐ and Photochemical Synthesis

et al. 2019

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Section: Validation and Robustness Of The Ic Methodsmentioning

confidence: 99%

Improving the Reliability and Accuracy of Ammonia Quantification in Electro‐ and Photochemical Synthesis

et al. 2019

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“…Anions were separated by an IonPac AS9-HC analytical column (4 ϫ 250 mm) and ASRS-Ultra 4-mm suppressor using sodium carbonate/bicarbonate solution as an eluent. Isocratic separation of cations or gradient separation for methylamine 26 was done by an IonPac CS16 analytical column (4 ϫ 250 mm) kept at 40°C and a CSRS-Ultra II 4-mm suppressor. The eluent for cations was a methanesulfonic acid solution.…”

Section: Chromatographic Analyses Nhmentioning

confidence: 99%

Investigation of the Ultraviolet Photolysis Method for the Determination of Organic Nitrogen in Aerosol Samples

Calderón

Poor

Campbell

2006

Journal of the Air & Waste Management Association

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The research objective was to adapt the ultraviolet (UV)-photolysis method to determine dissolved organic nitrogen (DON) in aqueous extracts of aerosol samples. DON was assumed to be the difference in total concentration of inorganic nitrogen forms before and after sample irradiation. Using a 2 2 factorial design the authors found that the optimal conversion of urea, amino acids (alanine, aspartic acid, glycine, and serine), and methylamine for a reactor temperature of 44°C occurred at pH 2.0 with a 24-hr irradiance period at concentrations Ͻ33 M of organic nitrogen. Different decomposition mechanisms were evident: the photolysis of amino acids and methylamine released mainly ammonium (NH 4 ϩ ), but urea released a near equimolar ratio of NH 4 ϩ and nitrate (NO 3 Ϫ ). The method was applied to measure DON in the extracts of aerosol samples from Tampa, FL, over a 32-day sampling period. Average dissolved inorganic (DIN) and DON concentrations in the particulate matter fraction PM 10 were 78.1 Ϯ 29.2 nmol-Nm Ϫ3 and 8.3 Ϯ 4.9 nmol-Nm Ϫ3 , respectively. The ratio between DON and total dissolved nitrogen ([TDN] ϭ DIN ϩ DON) was 10.1 Ϯ 5.7%, and the majority of the DON (79.1 Ϯ 18.2%) was found in the fine particulate matter (PM 2.5 ) fraction. The average concentrations of DIN and DON in the PM 2.5 fraction were 54.4 Ϯ 25.6 nmol-Nm Ϫ3 and 6.5 Ϯ 4.4 nmol-Nm Ϫ3 , respectively.

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“…For cation exchangers, cation exchange sites mainly contain sulfonic, carboxylic, and phosphonic functional groups. The simultaneous analysis of alkali and alkaline earth metals can only be realized with carboxylic acid based cation exchangers [6][7][8][9][10][11][12]. Therefore, preparing the carboxylic acid based cation exchangers is of great importance.…”

Section: Introductionmentioning

confidence: 99%

Preparation of poly(glycidylmethacrylate‐divinylbenzene) weak acid cation exchange stationary phases with succinic anhydride, phthalic anhydride, and maleic anhydride for ion chromatography

Liu

Wang

et al. 2016

J of Separation Science

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In this work, poly(glycidylmethacrylate-divinylbenzene) microspheres were prepared and applied for the preparation of weak acid cation exchange stationary phases. Succinic anhydride, phthalic anhydride, and maleic anhydride were selected as carboxylation reagents to prepare three weak acid cation exchangers by direct chemical derivatization reaction without solvent or catalyst. The diameters and dispersity of the microspheres were characterized by scanning electron microscopy; the amount of accessible epoxy groups and mechanical stability were also measured. The weak acid cation exchangers were characterized by Fourier transform infrared spectroscopy; the content of carboxyl groups was measured by traditional acid base titration method. The chromatographic properties were characterized and compared by separating alkali, alkaline earth metal ions and ammonium and polar amines. The separation properties enhanced in the order of succinic anhydride, phthalic anhydride, and maleic anhydride modified poly(glycidylmethacrylate-divinylbenzene) cation exchangers.

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High-capacity cation-exchange column for enhanced resolution of adjacent peaks of cations in ion chromatography

Cited by 35 publications

References 5 publications

Improving the Reliability and Accuracy of Ammonia Quantification in Electro‐ and Photochemical Synthesis

Improving the Reliability and Accuracy of Ammonia Quantification in Electro‐ and Photochemical Synthesis

Investigation of the Ultraviolet Photolysis Method for the Determination of Organic Nitrogen in Aerosol Samples

Preparation of poly(glycidylmethacrylate‐divinylbenzene) weak acid cation exchange stationary phases with succinic anhydride, phthalic anhydride, and maleic anhydride for ion chromatography

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