30 
BULLETIN 6 2, HAWAII EXPERIMENT STATION 
amounts of normal potassium hydroxide used were 5, 10, 15, 20, and 
25 cubic centimeters. The concentrations were determined after 
0, 15, 30, 45, 60, and 75 minutes of settling time. Corrections were 
made for the increase in density of the dispersing medium due to the 
potassium hydroxide. Table 12 shows the results obtained. 
nO 
30 
20 
Soil No. 2 
Soil No. 37 
Soil No. 6 
Soil No. <tZ 
30 
20 
^0 
30 
20 
Soil No. 48 
Composite curve for a// five soils. 
15 minutes 
15 minutes 
Figure 11. — Graphical comparison of the efficiency of various chemicals in dispersion 
Table 12.- — Effect of increase in concentration of alkali (EOH) upon degree of 
dispersion of a typical Haicaii clay 
[Results expressed in grams per liter of solid matter in suspension] 
Solid matter in suspension after settling for— 
Amount of KOH, cubic centimeters 
min- 
utes 
15 min- 
utes 
30 min- 
utes 
45 min- 
utes 
60 min- 
utes 
75 min- 
utes 
5 
Grams 
40.3 
39.9 
39.5 
39.1 
39.7 
Grams 
28.3 
27.4 
28.0 
28.6 
28.2 
Grams 
26.3 
26.4 
26.5 
26.6 
26.7 
Grams 
25.3 
25.4 
25.5 
25.1 
25.2 
Grams 
24.3 
24.9 
24.0 
24.6 
24.2 
Grams 
22.8 
10 
23.4 
15 
23.5 
20. 
23.6 
25 
22.7 
