Determination of ammonia and methylamines in aqueous solutions by ion chromatography

Abstract

able." Method B-extractable material (total BIAS), composed of surfactant BIAS and polyglycol BIAS, persists longer and results from the slower degradation of free polyglycol material which may be recovered in the CHCI3 extract of method C. This method may be useful for biodegradability testing and other laboratory tests and may, after some additional work, be useful for determination of nonionic surfactants and their degradation products in environmental samples.

Emissions of ammonia and amines from vehicles on the road

“…Each filter was immersed, immediately after sampling, in 0.01 N H2S04 (10 mL). The H2S04 impinger and filter solutions were analyzed for NH4+ and alkylammonium ions by an ion chromatographic procedure patterned after one described elsewhere (27) and also for amines by gas chromatography with a nitrogen-sensitive detector. The gas chromatographic method (28) employs a 1.8 m X 2 mm glass column packed with 4% Carbowax 20M/0.8% KOH on Carbopak B, the silanized glass wool having been removed from the front of the column in order to prevent adsorptive losses of the amines and to prevent a "memory" effect.…”

Towards a generic method for ion chromatography/mass spectrometry of low‐molecular‐weight amines in pharmaceutical drug discovery and development

“…18,19 This potentially complicates the analysis, decreasing sample throughput, increasing the likelihood of sample loss and potentially increasing the complexity of the sample through incomplete or side reactions. Ion chromatography (IC) has widely been used for the analysis of amines for over four decades, [20][21][22][23][24][25][26] most frequently with conductivity detection, but amperometric detection has also been used. [27][28][29] Previous work has been reported where IC has been interfaced to MS. [30][31][32] The use of MS provided increased selectivity to overcome co-elution, and also increased sensitivity.…”

Gas chromatography/mass spectrometry determination of water-soluble primary amines as their pentafluorobenzaldehyde imines

“…Direct analysis of aqueous samples minimizes sample preparation, thereby improving precision and reducing sample contamination. Direct methods include GC with an aminedeactivated column (1-3) and ion chromatography (4). Both techniques are limited to parts-per-million level determinations.…”

“…The 70-eV electron impact mass spectra of the imine derivatives are as follows: methylamine, 208 (100), 209 (85), 181 (29), 117 (18), 93 amine samples. Numbered peaks refer to the pentafluorobenzaldehyde ¡mines of (1) methylamlne, (2) ethylamine, (3) tert-butylamine, (4) n-propylamine, (5) sec-butylamine, (6) Isobutylamine, (7) n-butylamine, and (8) n-pentylamine. (3); sec-butylamine, 222 (100), 57 (12), 180 (9), 181 (9), 236 (9), 161 (9), 223 (6), 194 (3); tert-butylamine, 57 (100), 236 (20), 180…”