BS ISO 17734-1. Determination of organonitrogen compounds in air using liquid chromatography & mass spectrometry. Isocyanates using dibutylamine derivatives Air, Environment (working), Occupational safety, Chemical analyis & testing, Gas analysis, Determination of content, Aliphatic nitrogen compounds, Isocyanates, Degradation, Butyl compounds, Amines (aliphatic), Liquid chromatography, Mass spectrometry