Determination of Aromatic Amines in Soils

Abstract

A rapid liquid chromatographic (LC) method with ultraviolet (UV) or fluorescence detection was developed for parts-per-billion levels of aromatic amines in soils. 2,4-Diaminotoluene, pyridine, aniline, 2-pi-coline, 2-toluidine, 5-nitro-2-toluidine, 2-methyl-6-ethylaniline, 4-aminobiphenyl, 4-nitroaniline, 1-naphthyl-amine, 2-methoxyaniline, and 2-naphthyiamine were tested. The method involves extraction by sonication with 1% ammonium hydroxide–acetonitrile and analysis by LC using gradient elution with aqueous 0.01 M ammonium acetate–0.0005% triethylamine and acetonitrile. Recoveries of 67–106% (9.2 and 34% for 1-and 2-naphthylamines, respectively) were obtained from sand and organic-containing soils spiked in the parts-per-million range. Recoveries from sand spiked at 8.5–25 ppb were 88–105%. Recoveries from organic soil varied from nondetectable to 86% at spikes of 85–500 ppb. Detection limits ranged from 0.5 ppb for highly fluorescent 2-naphthyiamine (by fluorescence detection) to 0.5 ppm for nonfluorescing pyridines (by UV detection).

Fluorescence of Aromatic Amines and Their Fluorescamine Derivatives for Detection of Explosive Vapors

“…An environmental high-performance liquid chromatography (HPLC) method with fluorescence detection for aminoaromatics in soil has been reported. 7 This is a laboratory method and requires the use of more solvent. To the extent that we are talking about explosive vapors rather than soil or ground water samples, most matrix and quenching effects are eliminated.…”

Determination of Aniline in Soil by ASE/GC-MS

“…GC-MS is presently popular in quality control laboratories, mainly due to its wide range of applications and relatively inexpensive cost when compared with LC-MS systems. Traditional sample extraction methods such as ultrasonic assisted [ 22 ], stir bar adsorption extraction (DLME) [ 23 ], and Soxhlet extraction [ 24 ] entail a great deal of sample handling and use of large volumes (100–250 mL) of organic solvents. They are prone to analyte losses and require long extraction times (3–8 h) [ 25 ].…”