Chemical Methods of Rock Analysis by D. Hutchison, P G JEFFREY

By D. Hutchison, P G JEFFREY

A pragmatic advisor to the equipment quite often use for the full research of silicate rock fabric and for the decision of all these parts found in significant, minor or hint quantities in silicate and different rocks which are normally, as a rule or
occasionally decided by means of tools which are thought of to be primarily chemical in personality. Such equipment contain these established upon spectrophotometry, flame emission spectrometry and atomic absorption spectroscopy, in addition to gravimetry, titrimetry and using ion-selective electrodes. Separation phases are defined in complete, utilizing precipitation, solvent extraction, distillation, and ion-ex methods as acceptable. the recent version has been absolutely revised and updated.

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DETERMINATION OF ALUMINIUM BY DIFFERENCE The aluminium content of the rock material, as determined by the difference method, Classical Scheme for the Analysis of Silicate Rocks 39 is obtained by subtracting from the total of mixed oxides expressed as a percentage of the sample taken, the combined total of other elements present, each determined separately. These elements include total iron, calculated as Fe 0 , titanium as TiO , phosphorus as PJD , vanadium as V 0 , chromium as Cr 0_, zirconium as ZrC) , c- 3 2P 2 ^ £ Z> that part of the manganese present in the residue, calculated as Mn 0, and "silica traces" as SiO .

DETERMINATION OF MANGANESE IN THE MAGNESIUM RESIDUE The ignited magnesium pyrophosphate residue is fully soluble in dilute hydrochloric acid only with some difficulty. It is, however, soluble in concentrated sulphuric acid, to give a solution that can be readily used for the photometric determination of that portion of manganese not precipitated with ammonia and incorporated in the "mixed oxides". Procedure. Moisten the magnesium pyrophosphate residue with 5 ml of water, add 2 ml of concentrated nitric acid and 5 ml of 20 N sulphuric acid.

Soc. Glass Technol. (1959) it3, 5T *f. , Analyst (1933) 58, 673 3. , Mineral. Mag. (1928) _21_, 318 6. 87O 7. PECK L C and SMITH V C , U S Geol. Surv. Prof. ^01, 1961 25, 379 CHAPTER 4 The Rapid Analysis of Silicate Rocks The complete chemical analysis of silicate rocks using classical methods is very time consuming and requires the services of a skilled analyst. expensive. Such analyses are A geologist studying a particular exposure is likely to be restricted by cost to those analyses that are illustrative rather than to those that are informative.

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