By D. Hutchison, P G JEFFREY
A pragmatic advisor to the tools generally use for the full research of silicate rock fabric and for the decision of all these components found in significant, minor or hint quantities in silicate and different rocks which are mostly, regularly or
occasionally made up our minds through equipment which are thought of to be primarily chemical in personality. Such equipment comprise these dependent 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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Extra resources for Chemical Methods of Rock Analysis
35 The loss in weight Set the crucible aside for the ignition of the ammonia precipüate. To determine the correction, transfer filter papers equal in number to those used in the silica determination, to a clean, weighed platinum crucible, burn off the carbon and ignite over a Meker burner. the residue obtained. Allow the crucible to cool and then weigh This gives the weight offilterpaper ash. Now add 5 drops of 20 N sulphuric acid and 10 ml of concentrated hydrofluoric acid, transfer the crucible to a hot plate and evaporate the hydrofluoric and sulphuric acids as with the silica evaporation.
If the determination of silica is not to be made immediately, transfer the solution to a clean, dry, polythene bottle for storage. This solution can be used for the determination of silica by a molybdenum blue method as described in Chapter 37» and other elements by atomic absorption spectroscopy or spectrophotometry as appropriate. SCHEME OF B E L T ( 1 9 ) This, one of the earliest using atomic absorption spectroscopy, was developed before the widespread use of the high-temperature nitrous oxide-acetylene flame.
Although there are considerable varations in detail between one scheme for the rapid analysis of silicate rocks and another, in outline at least there is a striking uniformity. Thus the details shown in Fig. 2, although taken from a later version of the scheme by Shapiro and Brannock, (6) apply equally well to the scheme of Blanchet and Malaprade Jackson, and have more than a passing resemblance to those of Corey and Riley and Williams and others. -ΓποΓ H MnO s H 2 SO 4 (HCI0 4 ) I P*°s s H Na,K20 s - spectrophotometric f - flame photometric t - titrimetric FIG 2.