Air, water, and food from a sanitary standpoint . ided clay in suspension, fil-tration through paper will not be satisfactory, and the samplemust be filtered by suction through a cylinder of ungazedporcelain, such as an ordinary Chamberland-Pasteur hi er-tube. In the filtered water it is customary to determine thedissolved solids, the albuminoid ammonia, or the organicnitrogen, and the color. Determination of Free and Albuminoid Ammonia —Apparatus*—The apparatus used for the determination of ammonia is that shownin Fig. 8. It consistsof a round-bottomedflask of 900 capaci-ty, with square
Air, water, and food from a sanitary standpoint . ided clay in suspension, fil-tration through paper will not be satisfactory, and the samplemust be filtered by suction through a cylinder of ungazedporcelain, such as an ordinary Chamberland-Pasteur hi er-tube. In the filtered water it is customary to determine thedissolved solids, the albuminoid ammonia, or the organicnitrogen, and the color. Determination of Free and Albuminoid Ammonia —Apparatus*—The apparatus used for the determination of ammonia is that shownin Fig. 8. It consistsof a round-bottomedflask of 900 capaci-ty, with square shoul-ders and a narrow neckfive inches long, and anordinary Liebig con-denser fitted with tube of block tin,,3/16 of an inch in diame-ter. The flask is closedby a cork carrying aglass tube bent nearly atright angles, whichslips for some distancewithin the tin tube cfthe condenser. A tightjoint is made by meansof a large cork, whichis shown in section inFig. 9. The large corkserves the double purpose of making a tight joint with the. 8.—Apparatus for Ammonia Dis-tillation. * A. H. Gill : /. Anal, and App. Chem., 6 {1892), 669. WATER: ANALYTICAL METHODS. IOI condenser and also as a convenient means for handling- thesmall glass tube. In order to remove the cork from the dis-tilling-flask, the glass tube carrying it is simply turned to oneside, using the large cork as a pivot. The flasks are heatedwith the free flame of a Bunsen burner. New flasks are treated with boiling dilute sulphuric acidand potassium bichromate before they are used. New corksshould be steamed out for one or two hours. A good, soundcork will last for several months with daily use. The dis- ssssssssssssssssssss/ss/./ . n-
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