Introduction, [pp. 1-4].—Natural fertilizers; Waste matters as fertilizing materials; Valuation of fertilizing ingredients.
General Analytical Processes, [pp. 4-15].—Taking samples; Fertilizing minerals; Mixed fertilizers; French methods of taking samples; Sampling stable manures; Preparation of sample in laboratory; French and German methods; Drying fertilizer samples; Moisture in acid phosphates.
Analysis of Mineral Phosphates, [pp. 15-39].—Constituents to be determined; Direct estimation of phosphoric acid; Official method; Preparation of solution; Use of tartaric acid; Determination of water and organic matters; Carbon dioxid; Soluble and insoluble matter; Silica and insoluble bodies; Estimation of lime; Ammonium oxalate method; Immendorff method; Estimation of iron and alumina; The acetate and Hess methods; Methods of Jones and Crispo; Geological Survey method; Method of Marioni and Fasselli; Method of Krug and McElroy; Method of Wyatt; Estimation of magnesia; of sulfuric acid; of fluorin.
General Methods for Phosphoric Acid, [pp. 39-57].—Preliminary considerations; Estimation as stannic phosphate; Water soluble acid; Citrate insoluble acid; Total phosphoric acid; Norwegian methods; German experiment station methods; Soluble phosphoric acid; Swedish methods; Dutch methods; Errors in molybdate method; Color of pyrophosphate; Solution in sulfuric acid.
The Citrate Method, [pp. 57-70].—General principles; Halle method; Swedish method; Methods adopted at the Brussels Congress; Dutch method for citrate soluble acid; Comparative accuracy of citrate and molybdate methods.
Basic Phosphatic Slags, [pp. 70-86].—History and manufacture; Composition; Molecular structure; Solubility; Separation and solution; Estimation of total acid; Alternate method; Halle method of analysis; Dutch method; Estimation of citrate soluble acid in basic slags; Wagner’s shaking and digesting apparatus; Estimation of caustic lime in slags; Detection of adulteration.
Volumetric Determination of Phosphoric Acid, [pp. 86-106].—Classification of methods; Uranium method; Preparation of sample; Precipitation of the phosphoric acid by magnesium citrate; Composition of magnesium citrate solution; Solution of ammonium magnesium phosphate; Preparation of standard solutions; Verifying standard solutions; Conduct of the analysis; Phosphoric acid in superphosphates; Determination of soluble and reverted phosphoric acid; Conclusions.
Titration of the Yellow Precipitate, [pp. 106-118].—Pemberton’s method; Conduct of the analysis; Reactions; Calculation of results; Comparison with Official method; Titration as a lead compound; Water soluble acid; Estimation of phosphoric acid in presence of a large excess of iron; Emmerton method; Method of Dudley and Noyes; The Jones reductor; The volumetric silver method.
Technical Determination of Phosphoric Acid, [pp. 118-125].—Desirability of methods; Reagents employed; Conduct of the molybdenum method; Conduct of the citrate method; Treatment of mineral phosphates and basic slags; Analysis of superphosphates.
Miscellaneous Notes on Phosphates and Phosphatic Fertilizers, [pp. 126-150].—Time required for precipitation; Examination of the pyrophosphate; Iodin in phosphates; Chromium in phosphates; Estimation of Vanadium; Fluorin in bones; Note on separation of iron and alumina from phosphoric acid; Ammonium citrate soluble acid; Influence of time and strength of solvent on solution; Arbitrary Determination of reverted phosphoric acid; Digestion apparatus of Huston; Huston’s mechanical stirrer; Citrate method with small percentage of phosphoric acid; Direct precipitation of the citrate soluble phosphoric acid; Availability of phosphatic fertilizers; Direct weighing of the molybdenum precipitate.