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An analytical method for the rapid isolation and recovery of the homologous series of 2-aminoethanols, a class of organic compounds of importance to wood preservative treatment, is successfully developed. The method is applied to an aqueous solution of copper amine (copper[II] hydroxide complexed monoethanolamine) and to copper-amine-treated sawdust. The method incorporates a gas chromatograph—ion-trap mass spectrometer. A discussion of the secondary equilibrium effects involved when ionizable analytes are extracted from an aqueous phase with respect to organic bases is presented. Using 2-propanol as the extractant coupled to a salt-saturated aqueous phase results in recoveries of 63% for 2-aminoethanol, 51% for  N,N -dimethyl-2-aminoethanol, and 56% for  N -methyl-2-aminoethanol for a single liquid—liquid extraction. The choice of 2,2,2-trifluoroethanol as an internal standard is found to be quite suitable. A comparison of the precision and accuracy for an external versus an internal mode of instrument calibration demonstrates that the internal standard mode is preferable for this manual injection.

journal of chromatographic science

Isolation and Recovery of 2-Aminoethanol,  N -Methyl-2-Aminoethanol, and  N,N -Dimethyl-2-Aminoethanol from a Copper Amine Aqueous Matrix and from Amine-Treated Sawdust Using Liquid—Liquid Extraction and Liquid—Solid Extraction Combined with Capillary Gas Chromatography—Ion-Trap Mass Spectrometry