SECTION VI.— EXAMINATION OF 

 WATERS AND SOAP 



CHAPTER XXII 



Analysis of Water 



The complete analysis of water includes the determination of :— 

 (i) Suspended matter. 



(2) Total dissolved solids. 



(3) Organic matter, free and albuminoid ammonia. 



(4) Nitrates and nitrites. 



(5) Chlorides. 



(6) Hardness, temporary and permanent. 



It is also sometimes necessary to determine the oxygen absorbed 

 by the organic matter present and make a quantitative examina- 

 tion of the dissolved solids. According as the water is to be used 

 for potable or industrial purposes, or for the preparation of sprays, 

 certain of these estimations may be left out. 



A fair average sample of the water must be taken, and for a 

 complete analysis a couple of Winchesters should be filled, 

 stoppered, and kept in a cool dark place until required. If the 

 hardness only is to be determined, a much smaller sample will 

 suffice. The analysis should follow as soon as possible after the 

 collection of the sample. 



Preliminary Examination. 



209. Suspended Matter. 



If the water contains much suspended matter, this is 

 estimated by filtering 250 c.c. of the well-shaken sample 



2X4 



