||Separation of T-MAZ Ethoxylated Sorbitan Fatty Acid Esters by Reverse Phase Chromatography.
Ye, M. Y. ;
Walkup, R. G. ;
Hill, K. D. ;
||ManTech Environmental Technology, Inc., Ada, OK.;Robert S. Kerr Environmental Research Lab., Ada, OK.
||EPA-68-C8-0025 ;EPA-68-C3-0322; EPA/600/J-94/271;
Aliphatic acid esters ;
Molecular weight ;
Chemical analysis ;
Column packings ;
Ethoxylated sorbitan fatty acid esters ;
Reverse phase chromatography ;
Gel permeation chromatography
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
The method for determination of T-MAZ ethoxylated sorbitan fatty acid esters is described. The work demonstrates that with a less retentive C8 alkyl bonded phase packing, reverse phase chromatography can be used to analyze nonionic polymer mixtures with a molecular weight range of 900 to 1500. Using a gradient elution, a complete separation of T-MAZ eligomers was achieved, comparable to that obtained by Supercritical Fluid Chromatography (SFC). Isocratic elution is used to quantify T-MAZ and the detection limit is 321 ppm, which is acceptable for polymers with high molecular weights and no UV-absorbing chromophores. The work also shows the comparison of the separations of T-MAZ using gel permeation chromatography and reverse phase chromatography. (Copyright (c) 1994 Friedr. Vieweg & Sohn Verlagsgesellschaft mbH.)