Only sample UF PC-1 showed no gain in moisture. Despite the substantial increases in moisture for most samples, none of the samples, with the possible exception of PITT PC-4, recovered all the moisture lost on drying. Results of the experiments indicate that, once dry, a coal sample will not adsorb enough water to regain its original moisture content. They concluded that coal rank, particle size, and degree of oxidation affected moisture removal and replacement. The Argonne Premium Coal samples behave in a typical fashion with respect to rehydration.
Improper storage can lead to substantial moisture loss.
Resaturation generally will restore some of the lost moisture. These observations on moisture loss are important if measurements of physical properties are to be made on samples that have been stored under noncontrolled conditions for any length of time. Moisture content of each coal sample should be determined just prior to chemical analysis of whole coal. If there is insufficient sample for moisture determination, rehydrate the sample to reduce the error. Created and maintained by the EERT WWW Staff .