Chemical Analysis Of Silicate Rocks

Chemical Analysis Of Silicate Rocks

1st Edition - January 1, 1972

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  • Author: A Easton
  • eBook ISBN: 9780444601711

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Chemical Analysis of Silicate Rocks is the sixth book in the series, “Methods in Geochemistry and Geophysics.” This book provides procedures in chemical analysis of the principal types of silicate rocks and minerals, and it discusses each procedure at length. The book presents different apparatuses and reagents, such as balance and weighs, glassware and porcelain, platinum and substitutes, and filters that are used in the chemical analysis of silicate rocks. Laboratory instruments, such as pH meters, spectrophotometers and flame photometers, are presented in the third chapter. The fourth chapter focuses on the major factors in spectrophotometric methods. The next three chapters cover the common operations in silicate analysis, chemical analysis of silicate rocks, and preparation of the laboratory sample. From chapter eight through 20, each chapter discusses various silicate rocks and minerals, and presents the methods to be used for their chemical analysis. These chemical components are silicon, total iron, titanium, aluminum, calcium, magnesium, ferrous iron, manganese, chromium, alkalies, water and carbon dioxide, phosphorus, and total sulfur. Chapters 21 and 22 offer the formulas of minerals and the determination of specific gravity. The book closes by providing notes on the precision and accuracy of results obtained in silicate rock.

Table of Contents

  • Preface


    Chapter 1. Introduction

    Preliminary remarks

    Chapter 2. Apparatus and Reagents

    Balance and weights

    Glassware and porcelain

    Platinum and substitutes

    Platinum ware




    Chapter 3. Laboratory Instruments

    pH meters


    Flame photometers

    Chapter 4. Major Factors in Spectrophotometric Methods

    Choice of method

    pH of solution

    Oxidation and reduction of solutions

    Presence of interfering elements

    Period of reaction

    Stability of complexes


    Photo-sensitive complexes


    Chapter 5. Common Operations in Silicate Analysis

    Decomposition by fluxes

    Sodium carbonate fusion

    Potassium bisulphate fusion

    Sodium peroxide fusion

    Fusion of sulphide-containing minerals

    Decomposition by acids

    Acid-resistant minerals and insoluble residues






    Washing of precipitates

    Drying and ignition of precipitates


    Chapter 6. Chemical Analysis of Silicate Rocks

    The constituents occurring in rocks

    The general procedure (The separation of the six groups of elements)

    Acid group

    Hydrogen sulphide group

    Ammonium hydroxide group

    Ammonium sulphide group

    Ammonium oxalate group

    Ammonium phosphate group

    Alkali group

    Chapter 7. Preparation of the Laboratory Sample

    General remarks





    Silicates without metal

    Silicates with metal

    Carbonaceous chondrites

    Silicate phase of stony irons

    Metal phase of stony irons and iron meteorites

    Correcting analytical results to the "dry basis"

    Chapter 8. Silicon

    Consideration of methods

    Gravimetric determination of silicon in silicate rocks and minerals in absence of appreciable chlorine, fluorine or sulphur

    Spectrophotometric determination of silicon

    Determination of residual silicon in filtrate (12)

    Determination of silicon in a suite of rocks of similar composition

    Volumetric determination of silicon

    Rapid gravimetric determination of silicon in highly siliceous materials

    Chapter 9. Total Iron

    Consideration of methods

    Removal of iron by extraction with ether

    Determination of Total iron in silicate rocks and minerals

    Volumetric determination

    Total iron by the Sulphide-permanganate method without regard to vanadium

    Spectrophotometric determination

    Total iron as Fe203 by the 2,2'-dipyridyl method

    Other methods

    Gravimetric determination of Total iron after separation by ion-exchange method

    Chapter 10. Titanium

    Consideration of methods

    Spectrophotometric determinations

    Titanium by the hydrogen peroxide method

    Titanium by the tiron method

    Titanium by the EDTA-tiron method

    Other methods

    Chapter 11. Aluminium

    Consideration of methods

    Determination of alumina in silicate rocks

    Alumina "difference"

    Volumetric determination

    Alumina by the EDTA-method

    Spectrophotometric determination

    Alumina by the 8-hydroxyquinoline method

    Chapter 12. Calcium

    Consideration of methods

    Determination of calcium oxide in silicate rocks in absence of excessive amounts of magnesium and phosphorus

    After precipitation as oxalate

    After precipitation as phosphate along with magnesium

    Chapter 13. Magnesium

    Consideration of methods

    Determination of magnesia in silicate rocks in absence of excessive amounts of phosphorus, alkali salts, and oxalates

    After precipitation as phosphate

    After separation of the Ammonium oxalate group

    Chapter 14. Ferrous Iron

    Consideration of methods

    Ferrous iron by the permanganate method

    Ferrous iron by the 2,2'-dipyridyl method

    Chapter 15. Manganese

    Consideration of methods

    Volumetric determination

    Spectrophotometric determination

    Chapter 16. Chromium

    Consideration of methods

    Chrome minerals

    Chromate method


    Diphenylcarbazide method

    Ammonia precipitates

    Other methods

    Chapter 17. Alkalies

    Consideration of methods

    Preliminary group separation

    Addition of similar concentrations of interfering elements to the standards

    Radiation buffers

    Internal standards

    Standard addition

    Ion exchange separation of interfering elements

    Scanning of emission peak and deduction of background

    Physical factors

    Chapter 18. Water and Carbon Dioxide

    Consideration of methods

    Uncombined water

    Combined water

    Chapter 19. Phosphorus

    Consideration of methods

    Decomposition of samples containing phosphorus

    Attack by hydrofluoric and nitric acids

    Fusion with sodium carbonate

    Separation of phosphorus by the ion-exchange method

    Principle of method

    Spectrophotometric determination of phosphorus pentoxide in silicate rocks and minerals

    By the molybdivanadophosphoric acid method

    By the molybdenumbluephosphoric acid method

    Chapter 20. Total Sulphur

    Consideration of methods

    Gravimetric determination of Total sulphur in silicate rocks and minerals, containing no more than 2.5 per cent Total S

    Chapter 21. Formulas of Minerals



    Possible points for checking a chondrite meteoritic analysis

    Chapter 22. Determination of the Specific Gravity


    Mineral grains

    Chapter 23. Notes on the Precision and Accuracy of Results Obtained in Silicate-Rock Analysis and the Limit of Allowable Error



Product details

  • No. of pages: 270
  • Language: English
  • Copyright: © Elsevier 1972
  • Published: January 1, 1972
  • Imprint: Elsevier
  • eBook ISBN: 9780444601711

About the Author

A Easton

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