Document Type

Article

Publication Date

1993

Abstract

We have developed a new NMR-based procedure for studying waste/cement interactions. This is the first use of deuterium NMR spectroscopy to study waste solidification/ stabilization (S/S). The main feature of deuterium NMR spectroscopy is the ability to monitor molecular reorientations over a wide range of reorientation rates. This technique allows one to determine if a particular deuterated organic waste is effectively solidified/ stabilized and to determine the lower limit of the bond strength between the waste and the cement matrix. Comparison of the predicted and experimental deuterium NMR spectra show that phenol is mainly dissolved in pore waters and, thus, poorly immobilized by white portland cement, at least for cure times up to 1 year. After evaporation of the pore water from the cement matrix the 2H line shape and T1 were measured at 230-360 K; the maximum activation energy for the 180° ring flip process is 5.5 kcal/mol. Hence, the lower limit of the bond strength between phenol and the cement matrix is approximately 5.5 kcal/mol.

Comments

Originally published in Environmental Science & Technology 27 (7) 1993, p. 1426-33

Posted with permission of ACS Nov 2014

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