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FALLING DROP USED FOR GRAIN‐SIZE ANALYSIS OF FINE‐GRAINED MATERIALS
Author(s) -
MOUM JOHAN
Publication year - 1965
Publication title -
sedimentology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.494
H-Index - 108
eISSN - 1365-3091
pISSN - 0037-0746
DOI - 10.1111/j.1365-3091.1965.tb01566.x
Subject(s) - drop (telecommunication) , stopwatch , particle size , grain size , silt , geology , mineralogy , materials science , soil science , environmental science , mechanics , composite material , geotechnical engineering , mathematics , statistics , mechanical engineering , engineering , geomorphology , physics , paleontology
SUMMARY To facilitate simultaneous performances of numerous grain‐size analyses covering the silt and clay fractions, a method has been worked out and the necessary equipment constructed for utilizing a falling drop for determining densities of particle suspensions. A drop is taken out by means of a micro‐syringe at the desired depth in a sedimentation vessel, and ejected into a column of an organic liquid with a slightly lower density. The drop then falls with a constant speed and the time measured with a stopwatch over a certain distance is a measure of the density of the drop, and hence also of the particle concentration in the sedimentation vessel where the drop is taken. In this way it is easily possible to work through twenty samples in a normal working day, including removal of organic matter, dispersion, washing (to remove effects of soluble salts) and evaluating the final results.