Page 10 - APPLIED INORGANIC ANALYSIS

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3. Preparation of Sample for Analysis.. 669
A. Quantity of Rock to Be Crushed. 669
B. Crushing 669
C. Grinding.. 672
D. Abrasion of Mortar and Pestle, 675
E. Weight of Sample.. 676
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4. Water ral Considerations....8.»»o»» 676
A. The Role of Hydrogen in Minerals... 676
B. Water Taken Up or Lost on Grinding..... 682
C. Importance of Employing Air-Dry Powder for Analysis.... 684
D. Argument in Favor of Including Hygroscopic Water in the Sum-
matum............. 684
5. Water Methods of Determination. 685
A. Indirect Methods. 686
B. Direct Methods without Absorption Tubes Penfield's Methods. 690
C. Direct Methods with Absorption Tubes. 692
6. Methods of Decomposing Rocks. 698
A. Decomposition by the Use of Flures... 698
B. Decomposition by the Use of Acids. 713
7. Silicon....... . . . 714
A. Special Cases.....»»»»·· 714
B. Silicate Analysis.....···. 7I6
8. Analysis after Separation of the Most of the Silicon.....»+. 727
A. Metals Preciptable by Hydrogen Sulphide. 728
B. Joint Precipitation of Aluminum, Iron, Titanium, Zirconium,
Chromium, Rare Earths, Phosphorus, and Vanadium with and
without Manganese....... 729
C. Manganese, Nickel, Cobalt, Copper, and Zinc..... 740
D. Calcium, Strontium (Barium) 744
E. Magnesium...»-·· 745
9. Titanium.. 745
A. General Considerations..»·.. 745
B. Colorimetric Determination with Hydrogen Pero.ride. 747
C. Gravimetric Methods...++++.+..9.... 749
D. Volumetric Methods.».·. 749
10. Barium (Zirconium, Rare Earths, Total Sulphur Chromium)...... 750
A, The General Method.....··»·. 750
B. The Method without Regard to Zirconium and Sulphur.... 752
11. Zirconium. . . . . . . . . . . 752
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A. Hillebrand's Method..· . 752
B. Other Methods. 755
12. Rare-earth Metals Other than Zirconium... 755
A. Usual Method.... 756
B. Alternative Method.... 756
13. Phosphorus. 757
A, Preliminary Remarks..... 757
B. Procedure when Material is Ample 757
C. Procedure when Material is Scanty. 758