. The chemistry of soils and fertilizers. Soils; Fertilizers. 74 SOILS AND FERTILIZERS. provided with a glass stopper which is connected with a condensing tnbe. The soil digestion flask is then placed in a hot water-bath and the di- gestion is carried on for twelve hours at the temperature of boiling water. After the digestion is completed the contents of the flask are transferred to a filter and separated into an insoluble part, and the acid solution which contains the com- pounds of the various elements. The following table will give a general idea of how the different materials are ob- tain
. The chemistry of soils and fertilizers. Soils; Fertilizers. 74 SOILS AND FERTILIZERS. provided with a glass stopper which is connected with a condensing tnbe. The soil digestion flask is then placed in a hot water-bath and the di- gestion is carried on for twelve hours at the temperature of boiling water. After the digestion is completed the contents of the flask are transferred to a filter and separated into an insoluble part, and the acid solution which contains the com- pounds of the various elements. The following table will give a general idea of how the different materials are ob- tained from the acid solution. This table is not intended as an outline for soil analysis, but simply to give the stu- dent of general chemistry an idea of how an analysis is made. The second half of the acid solution is divided into three portions. The first portion is used for the deter- mination of phosphoric acid. The acid is precipitated with ammonium molybdate. The second portion is used for determination of sulphuric acid, which is pre- cipitated as barium sulphate. The carbon dioxide is determined on a fresh portion of the original soil ; the acid is liberated with hydrochloric acid and the carbon dioxide is retained by absorbents and weighed. The nitrogen and humus are determined in separate portions of the original soil. Fig. 19. Diges- tion Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Snyder, Harry, 1867-1927. Easton, Pa. , The Chemical Publishing Co.
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