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A SIMPLE AND INEXPENSIVE APPARATUS FOR AUTOMATICALLY CONTROLLING SOLUTION FLOW RATES THROUGH SOIL COLUMNS
Author(s) -
GRAHAMBRYCE I. J.,
DAVIES R. I.,
ALRAWI A. A. H.
Publication year - 1967
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1967.tb01485.x
Subject(s) - volumetric flow rate , leaching (pedology) , column (typography) , permeability (electromagnetism) , flow (mathematics) , standard deviation , computer science , environmental science , chemistry , mathematics , soil water , soil science , mechanics , statistics , physics , telecommunications , biochemistry , frame (networking) , membrane
Summary Accurate control of rate of flow of solution through soil columns is important in laboratory studies of leaching, but is difficult to achieve because of fluctuations in permeability. A simple and inexpensive method of automatically maintaining a constant flow‐rate through several columns simultaneously is described. The apparatus comprises (i) a rotating delivery system which distributes the leaching solution equally to eight compartments, (ii) a system for automatically regulating the flow through each column to keep pace with the solution delivered, and (iii) an automatic fraction‐collector to collect the effluent from the columns. Using this apparatus the standard deviation of the volumes delivered to the eight individual columns was less than 2 per cent of the mean, provided the flow rate was faster than 10 ml/h.