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.
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.
Loconto
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PR
Department of Civil and Environmental Engineering, Michigan State University, East Lansing 48824, USA.
Pan
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Y
Kamdem
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DP
D000465:Algorithms; D000588:Amines / Q000032:analysis; D002138:Calibration; D002794:Choline / Q000031:analogs & derivatives* / Q000032:analysis / Q000302:isolation & purification; D003300:Copper / Q000032:analysis*; D019856:Ethanolamine / Q000032:analysis* / Q000302:isolation & purification; D004983:Ethanolamines / Q000032:analysis* / Q000302:isolation & purification; D008401:Gas Chromatography-Mass Spectrometry; D007202:Indicators and Reagents; D012996:Solutions; D014934:Wood
D000588:Amines; D004983:Ethanolamines; D007202:Indicators and Reagents; D012996:Solutions; C038146:N-amino-N,N-dimethylaminoethanol; D019856:Ethanolamine; D003300:Copper; D002794:Choline; C017500:N-methylaminoethanol