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78 > Image 78 of Annual report. 1914

Part of Kentucky Agricultural Experiment Station

60 Twenty-seventh Annual Report of the method for the determination of both calcium and magne- sium. This work has led us to adopt, tentatively, a modifi- cation of the method worked out by Behrman last year, ("A _ Rapid Method for the Analysis of Limestone for Agricultural Purposes/ by A. S. Behrman, Thesis for the degree of B. S. in Industrial Chemistry, State University, Lexington, Ky., June, 1914). In this method, the neutralizing power of the limestone is first determined by dissolving a weighed portion of the finely ground sample in a known measure of standard ' hydrochloric acid and titrating the excess with standard alkali and phenolphthalein, after boiling off the CO: and peroxidizing any ferrous compound with a little HzO2, sub- stantially as described by Behrman. Where the limestone is only slightly magnesian, this determination is all that is required to give a good estimate of its agricultural value. But if it is desired to actually determine the amount of calcium present as is the case with magnesian limestones, we make the same solution up to volume, without filtering, pipette out an aliquot, add a suitable quantity of ammonium chlorid, heat to boiling and precipitate with ammonium oxalate. The precipitate, containing the calcium as oxalate, is filtered, washed and the oxalate determined by titration with stand- ard KMnO solution in the usual way. From the neutralizing power and the amount of calcium thus found, the amount of magnesium present may be easily calculated. The results are accurate enough for practical purposes. The manuscript for a bulletin containing more than 1000 analyses of Kentucky limestones has been prepared and is ready for publication. MINERAL AND POTABLE WATERs. More or less quantita- tive work has been done upon 129 samples of mineral and potable waters from 43 counties. Such of these analyses as are believed to be of permanent value have been compiled and are submitted herewith for publication, (See pages 85-118 of this report). PLANT Foon IN SOLUTION IN THE Winans or SPRINGS AND STREAMS. Analyses of 32 samples of waters of springs and streams of the state have been made to determine the