SPE of aliphatic diamines in water

[emsman]

Hello,

I need to detect aliphatic diamines on ppm level in water. When I evaporate the samples and try to analyse with I revover only traces instead of 50-100%.
Has anybody experience of an appropriate SPE method, maybe including derivatisation for substances like hexamethylene diamine to transfer them from water into an organic solvent? GC or LC may be used.

Many thanks in advance
Emsman

[Uwe Neue]

Mixed-Mode SPE on Oasis MCX, with elution in methanol with ammonia, maybe around 5% ammonia.

[oscarBAL]

GC can work using a wax column.
but I think the best is Ion Chromatography.