May 12, 1923 
Effect of Decomposition on Concrete Tile 
485 
S0I.UBII,ITY OF mF IN DECARBONATED PEAT WATER 
Next, 400 cc. of the most acid peat water was taken, from which all 
carbonic acid had been removed by drawing through it air passed through 
sodium hydroxid, and 2 gm. of powdered tile vrere added. The solution 
was then agitated in the shaker machine, the residue filtered out on a 
dried, weighed, ashless filter, dried in an electric oven to constant dry¬ 
ness, weighed, and then residue and filter agitated for 14 hours in 400 cc. 
of carbonated water. 
Tabl^ X. —Results of agitating 2 gm, of tile with acid peat ivater and treating the residue 
with carbonic acid water ^ 
Item. 
Weight after 
treating with 
acid peat 
water. 
Weight of 
residue treated 
with carbon¬ 
ated water. 
Original sample.(giii-)- ■ 
Residue.• 
Per cent increase. 
2. 0000 
2. 1288 
6.44 
2. 1288 
1. 9129 
Per cent decrease from sample treated with peat water.... 
Per cent decrease from original. 
10. 14 
4-25 
' The filtering of the solution of tile with peat water was carried on with considerable difficulty, owing to 
the colloidal nature of the products, yet the solution showed only a slight turbidity. 
INCREASING ACIDITY OF ROTTING PEAT 
In order to ascertain whether the process of decay increased the per¬ 
centage of acid in solution or not, the acidity of the water on the peat 
cultures was tested after 20 days and compared with the lo-day culture. 
Conditions in the northern peat culture had been altered by the addition 
of more water, so that was excluded from the calculations. 
A titration of 100 cc. of the water with normal solution of sodium 
hydroxid was made, using phenolphthalein as an indicator. 
TABbE XI. —Amount of A normal alkaline solution required to neutralize the acidity 
of 100 cc. of water from 20-day cultures of surface peat and deep peat from University 
Marsh and the equivalent in grams of free lime per liter 
Sample taken. 
Amotmt 
of rh 
solution 
used. 
Equivalent 
to CaO per 
liter. 
Surface peat (a). . .... 
cc 
2 - 95 
3 - 15 
3 - 50 
3 - 30 
Gm. 
0. 0590 
0. 0630 
0. 0700 
0. 0660 
. ... 
feet peat (a). 
Do(b). 
