2—A Rapid Method of Determining Ether Extracts

Effect of shearing time on wool

“…The monthly greasy samples \\-ere exposed in the conditioning-room at 68°F and 65% r.h. and weighed. A portion of about 2 g was then weighed off and packed into a WIRA rapid-extraction tube (Dickinson and Palmer 1951 STORY AND Ross-EFFECT OF SHEARING TIME 115 grease was extracted by petroleum ether, the solution collected in a small flask, the solvent evaporated and the residue weighed. Solvent remaining in the wool was evaporated by drawing warm air through the tube and the suint was next extracted by warm distilled water, the solution being collected in an aluminium dish and evaporated on a hot plate, and the residue quickly weighed.…”

An Improved Method for the Rapid Determination of the Residual Grease on Scoured Wool

“…Apparatus (R1) When the loss of grease through evaporation, which can amount to 20~~0 of the rwg extract, is added. to the errors caused by sputtering and channelling of the solvent, it becomes apparent why comparative Soxhlet , residues are greater [7,9,20) .…”

“…All these methods are fully described in the literature [22, 25 J, although it is known that variations are used in some laboratories. The comparative performance of the Soxhlet and R 1 methods using various solvents on scoured wool and tops has been investigated [ 7,9,20), and it has been established that the standard Soxhlet method [222 J produces the heavier residue.…”