THE SIOUX CITY WATER SUPPLY. III. 
BY ALFRED N. COOK. 
Examination of various waters in Sioux City has been 
carried on at intervals during the past year. It will be 
observed by comparison with analyses of former years 
that there has been great fluctuation in the detrimental 
characters of the city water. During the past fall, for 
several months, the albuminoid ammonia reached and 
passed the danger limit. This is the first time this has 
been noted since this series of analyses was begun, 
although it was pointed out in an article published in the 
Sioux City Tribune over a year ago that this was likely to 
take place at some time in the future. The analysis made 
in February shows that the water was in fair condition 
again. Numbers 1 and 2 are used by permission of the 
president of the board of waterworks trustees. Numbers 
1, 3 and 4 were drawn at Morningside college. Number 2 
was furnished by Mr. Healy, president of the above men- 
tioned board. 
No. 1. 
No. 2. 
No. 3. 
No. 4. 
A. N. Cook, 
analyst, 
March, 1903. 
A. N. Cook, 
analyst, April 
13, 1903. 
Herbert Saylor, 
analyst , 
Dec., 1903. 
John K Acken- 
back, analyst, 
Feb., 1904. 
Total solids dried at 110°C 
414 
427 
431 
422 
Chlorides 
9.26 
8.36 
13.08 
10 
Nitrogen as nitrates 
.75 
2 
3.09 
1.5 
Nitrogen as nitrites 
None 
Trace 
None 
Trace 
Nitrogen as free ammonia 
.023 
.0138 
.048 
.0396 
Nitrogen as albuminoid ammonia 
.000 
.0162 
.160 
.0370 
Oxygen consuming power 
0.3 
.2 
.7 
.4 
( 133 ) 
