Determination of low-molecular-weight amines and ammonium in saline waters by ion chromatography after their extraction by steam distillation

A new method was developed for the determination of ammonium ion, monomethylamine and monoethylamine in saline waters by ion chromatography. Steam distillation was used to eliminate matrix interferences. Variables such as distillation time, concentration of sodium hydroxide solution and analyte mass...

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Bibliographic Details
Published in:Journal of separation science 2016-04, Vol.39 (8), p.1454-1460
Main Authors: Ferreira, Fernanda Nunes, Afonso, Julio Carlos, Pontes, Fernanda Veronesi Marinho, Carneiro, Manuel Castro, Neto, Arnaldo Alcover, Tristão, Maria Luiza Bragança, Monteiro, Maria Inês Couto
Format: Article
Language:English
Subjects:
Ammonium
Chromatography
Factorials
Ion chromatography
Mathematical analysis
Molecular weight
Monoethylamine
Monomethylamine
Potassium
Saline water
Salt water
Sodium
Steam distillation
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Summary:A new method was developed for the determination of ammonium ion, monomethylamine and monoethylamine in saline waters by ion chromatography. Steam distillation was used to eliminate matrix interferences. Variables such as distillation time, concentration of sodium hydroxide solution and analyte mass were optimized by using a full two‐level factorial (23) design. The influence of steam distillation on the analytical curves prepared in different matrices was also investigated. Limits of detection of 0.03, 0.05 and 0.05 mg/L were obtained for ammoniumion, monomethylamine and monoethylamine, respectively. Saline water samples from the Brazilian oil industry, containing sodium and potassium concentrations between 2.0–5.2% w/v and 96–928 mg/L, respectively, were analyzed. Satisfactory recoveries (90–105%) of the analytes were obtained for all spiked samples, and the precision was ≤ 7% (n = 3). The proposed method is adequate for analyzing saline waters containing sodium to ammoniumion, monomethylamine and monoethylamine concentration ratios up to 28 000:1 and potassium to ammonium, monomethylamine and monoethylamine concentration ratios up to 12 000:1.
ISSN:1615-9306
1615-9314
DOI:10.1002/jssc.201501387