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A dithizone method for the determination of lead in monazite

Trace Elements Investigations 630

This report concerns work done on behalf of the Division of Raw Materials of the U.S. Atomic Energy Commission
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Abstract

In determining lead in monazite [(Ce,La,Th)PO4]--to be used as the basis for geologic age measurements--it was necessary to eliminate interferences due to the presences of phosphates of thorium and the rare-earth metals.


The method, in which monazite samples are attacked with hot concentrated sulfuric acid, taken up with dilute nitric acid, lead extracted as the dithizonate and then determined spectrophotometrically at 520 mμ, was successfully applied to a series of monazite samples. Rapid determinations were made with good reproducibility.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
A dithizone method for the determination of lead in monazite
Series title:
Trace Elements Investigations
Series number:
630
Year Published:
1956
Language:
English
Publisher:
U.S. Geological Survey
Description:
18 p.