<?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>R. F. Sanzolone</dc:contributor>
  <dc:creator>T. T. Chao</dc:creator>
  <dc:date>1973</dc:date>
  <dc:description>&lt;p&gt;An atomic absorption spectrophotometric method has&amp;nbsp;been developed for the determination of seven metal ions in the&amp;nbsp;hydroxylamine extract of soils and sediments. Mn, Fe, and Zn are&amp;nbsp;directly determined in the aqueous extract upon dilution. Co, Ni, Cu,&amp;nbsp;and Pb in a separate aliquot of the extract are chelated with APDC&amp;nbsp;(ammonium pyrrolidine dithiocarbamate) and extracted into MIBK&amp;nbsp;(methyl isobutyl ketone) before determination. Data are presented to&amp;nbsp;show the quantitative recovery of microgram levels of Co, Ni, Cu, and&amp;nbsp;Pb by APDC-MIBK chelation-extraction from synthetic solutions&amp;nbsp;containing as much as 2,000 ug/ml (micrograms per milliliter) Mn or 50 ug/ml Fe. Recovery of known amounts of the metal ions from sample&amp;nbsp;solutions is equally satisfactory. Reproducible results are obtained by&amp;nbsp;replicate analyses of two sediment samples for the seven metals.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:language>en</dc:language>
  <dc:publisher>U.S. Geological Survey</dc:publisher>
  <dc:title>Atomic absorption spectrophotometric determination of microgram levels of Co, Ni, Cu, Pb, and Zn in soil and sediment extracts containing large amounts of Mn and Fe</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>