A simple new method for the determination of ammonium isotopes by gas chromatography-mass spectrometry. Issue 40 (29th September 2021)

• Record Type: Journal Article
• Authors: Guo, Wei; Jiang, Ran; Xinfeng, Zhang; Li, Jun
• Is Part Of: Analytical methods. Volume 13:Issue 40(2021)
• Page Start: 4814
• Page End: 4820
• Publication Date: 2021-09-29
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/d1ay00456e
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : We report a new method for the determination of naturally abundant 15 N (concentration of 15 N) in ammonium in water samples. It has low loss, one step reaction and target product isn't gas. GC-MS is used in this method, easily accepted by researchers. Abstract : We report a new method for the determination of naturally abundant 15 N (concentration of 15 N) in ammonium (NH4 + ) in water samples, including drinking water, surface water, groundwater, and seawater, by gas chromatography-mass spectrometry (GC-MS) based on the isotopic analysis of hexamethylenetetramine. The resulting product was obtained by the reaction between ammonium ions and formaldehyde under the given conditions (pH = 6.0, 40 °C, 30 min). Then, the species was extracted (with chloroform) and concentrated at pH = 8.5 and measured by GC-MS. The results showed that the relative standard deviation (RSD) of the δ 15 N measurements was less than 10% and the recoveries were in the range of 71–118% ( n = 5). The limit of detection was 20 μmol l −1 . Compared to the previous method, the present method is simple and highly suitable to be used as a routine method for the 15 N/ 14 N analysis of NH4 + .