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Automatic determination of the foam end point in a simulated dishwashing test
Author(s) -
Hartwig G. M.
Publication year - 1968
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02541251
Subject(s) - point (geometry) , end point , materials science , environmental science , computer science , composite material , mathematics , geometry , real time computing
The disappearance of foam when increments of soil are added is frequently used to assess the foam performance of surfactants in dishwashing. A small scale screening test has been published using a Terg‐o‐tometer to generate foam and disperse the soil. However, the end point is difficult to determine visually because of the violent agitation of the surface. A method has been developed, whereby the surface foam reflectance is automatically and continuously recorded from four beakers of surfactant solution simultaneously. Near the end point, the rate of foam disappearance is determined and the complete foam disappearance can be interpolated from the instrumental recorded curves. Comparisons are given for experienced operator and instrumentally determined end points which are shown to be in agreement.