By D. Hutchison, P G JEFFREY
A realistic advisor to the tools regularly use for the full research of silicate rock fabric and for the selection of all these parts found in significant, minor or hint quantities in silicate and different rocks which are oftentimes, more often than not or
occasionally decided by means of tools which are thought of to be basically chemical in personality. Such equipment contain these dependent upon spectrophotometry, flame emission spectrometry and atomic absorption spectroscopy, in addition to gravimetry, titrimetry and using ion-selective electrodes. Separation levels are defined in complete, utilizing precipitation, solvent extraction, distillation, and ion-ex systems as applicable. the recent variation has been absolutely revised and updated.
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Extra info for Chemical Methods of Rock Analysis
Boric acid is added to complex excess fluoride ion and to dissolve insoluble fluorides. After dilution to a suitable volume, the solution is aspirated into a nitrous oxide-acetylene flame for the deter mination of silicon, aluminium, titanium, vanadium, calcium and magnesium, and into an air-acetylene flame for total iron, sodium and potassium. The concentrations of all these elements is determined by reference to calibration graphs or by narrow range bracketing. Although it is known that most silicate rocks and minerals are completely decomposed by this hydrofluoric acid digestion, further work would appear to be desirable on its effectiveness in respect of the wide range of accessory minerals that occur in such rocks.
Biskupsky has suggested using a flux composed of boric acid and lithium fluoride for the decomposition of silicate rocks and minerals. Lithium tetraborate is formed in the fusion, whilst silica is removed as the volatile tetrafluoride. Both boron and excess fluoride are removed by heating the melt with concentrated sulphuric acid. Advantages claimed are that only 12 to 13 minutes fusion time is required and that zircon, sillimanite, topaz, spinel, corundum, rutile, kyanite and other refractory minerals are decomposed without difficulty.
Rinse the precipitate back into the beaker used for the precipitation and dissolve by warming with 5 ml of concentrated hydrochloric acid and 100 ml of water. Heat the solution to boiling and filter back through the paper, collecting the filtrate in a clean 400-ml beaker and washing the paper seven or eight times with warm water. *+0 Chemical Methods of Rock Analysis Add 2 g of ammonium oxalate dissolved in about 50 m l of warm water followed by concentrated ammonia solution until a slight precipitate forms that does not redissolve on stirring.