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<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>W.P. Johnson</dc:contributor>
  <dc:contributor>David L. Naftz</dc:contributor>
  <dc:contributor>D.F. Hayes</dc:contributor>
  <dc:contributor>W.O. Moellmer</dc:contributor>
  <dc:contributor>T. Miller</dc:contributor>
  <dc:creator>G. Dicataldo</dc:creator>
  <dc:date>2011</dc:date>
  <dc:description>&lt;p&gt;D&lt;span&gt;iel (24-h) changes in Se and As concentrations in a freshwater wetland pond bordering the Great Salt Lake (GSL) were examined. Selenium concentrations (filtered and unfiltered) changed on a diel basis, i.e., were depleted during early morning and enriched during daytime over August 17–18. During the May 24–25, 2006 and September 29–30 diel studies, no significant 24-h trends were observed in Se concentrations compared to August, which showed daily maximums up to 59% greater than the daily minimum. Both filtered and unfiltered As concentrations also varied on a diel cycle, with increased concentrations during early morning and decreased concentrations during daytime. Filtered As concentrations increased 110% during the May 24–25, 2006 diel study. Selenium varied in phase with pH, dissolved O&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;(DO), and water temperature (&lt;/span&gt;&lt;i&gt;T&lt;sub&gt;w&lt;/sub&gt;&lt;/i&gt;&lt;span&gt;) whereas As varied opposite to Se, pH, DO and&amp;nbsp;&lt;/span&gt;&lt;i&gt;T&lt;sub&gt;w&lt;/sub&gt;&lt;/i&gt;&lt;span&gt;. Changes in pH, DO and&amp;nbsp;&lt;/span&gt;&lt;i&gt;T&lt;sub&gt;w&lt;/sub&gt;&lt;/i&gt;&lt;span&gt;&amp;nbsp;showed a direct linear correlation (&lt;/span&gt;&lt;i&gt;r&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;=&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;0.74, 0.75, and 0.55, respectively) to filtered Se. Also pH, DO and&amp;nbsp;&lt;/span&gt;&lt;i&gt;T&lt;sub&gt;w&lt;/sub&gt;&lt;/i&gt;&lt;span&gt;&amp;nbsp;were inversely correlated to filtered As concentration (&lt;/span&gt;&lt;i&gt;r&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;=&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span&gt;−0.88, −0.87, and −0.84, respectively). Equilibrium geochemical speciation and sorption models were used to examine the potential oxidation state changes in Se and As, and sorption and desorption reactions corresponding to the observed 24-h variations in pe and pH. In this wetland it was postulated that diel Se variation was driven by sorption and desorption due to photosynthesis-induced changes in pH and redox conditions. Diel variations of As were hypothesized to be linked to pH-driven sorption and desorption as well as co-precipitation and co-dissolution with mineral phases of Mn.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/j.apgeochem.2010.10.011</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>Diel variation of selenium and arsenic in a wetland of the Great Salt Lake, Utah</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>