Abstract
The total content of trace elements in rocks, minerals and soils is determined by a semi-quantitativecathode layer arc spectrographic technique. For more accurate determinationsa variable internal standard technique, in which the trace element contents are compared with that of iron, is employed. This method is combined with a chemical concentration for the analysis of extracts of soils and plant materials. The chemical concentration technique involves the use of 8-hydroxyquinoline, tannic acid and thionalide, and gives recovery of microgram quantities of most trace elements, rejecting at the same time the alkalis, alkaline earths and phosphate.
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