<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>C. A. Kinser</dc:contributor>
  <dc:creator>R. A. Powell</dc:creator>
  <dc:date>1956</dc:date>
  <dc:description>&lt;p&gt;In determining lead in monazite [(Ce,La,Th)PO&lt;sub&gt;4&lt;/sub&gt;]--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.&lt;/p&gt;
&lt;br&gt;
&lt;p&gt;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 m&amp;mu;, was successfully applied to a series of monazite samples. Rapid determinations were made with good reproducibility.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.3133/tei630</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>U.S. Geological Survey</dc:publisher>
  <dc:title>A dithizone method for the determination of lead in monazite</dc:title>
  <dc:type>reports</dc:type>
</oai_dc:dc>