<?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>M.M. Reddy</dc:contributor>
  <dc:creator>J.A. Marinsky</dc:creator>
  <dc:date>1984</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;A unified physico-chemical model, based on a modified Henderson-Hasselbalch equation, for the analysis of ion complexation reactions involving charged polymeric systems is presented and verified. In this model pH = p&lt;/span&gt;&lt;i&gt;K&lt;/i&gt;&lt;sub&gt;&lt;i&gt;a&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;+p(&lt;/span&gt;&lt;i&gt;ΔK&lt;/i&gt;&lt;sub&gt;&lt;i&gt;a&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;) + log(&lt;/span&gt;&lt;i&gt;α&lt;/i&gt;&lt;span&gt;/1 −&amp;nbsp;&lt;/span&gt;&lt;i&gt;α&lt;/i&gt;&lt;span&gt;) where&amp;nbsp;&lt;/span&gt;&lt;i&gt;K&lt;/i&gt;&lt;sub&gt;&lt;i&gt;a&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;&amp;nbsp;is the intrinsic acid dissociation constant of the ionizable functional groups on the polymer,&amp;nbsp;&lt;/span&gt;&lt;i&gt;ΔK&lt;/i&gt;&lt;sub&gt;&lt;i&gt;a&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;&amp;nbsp;is the deviation of the intrinsic constant due to electrostatic interaction between the hydrogen ion and the polyanion, and alpha (α) is the polyacid degree of ionization. Using this approach p&lt;/span&gt;&lt;i&gt;K&lt;/i&gt;&lt;sub&gt;&lt;i&gt;a&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;&amp;nbsp;values for repeating acidic units of polyacrylic (PAA) and polymethacrylic (PMA) acids were found to be 4.25 ± 0.03 and 4.8 ± 0.1, respectively. The polyion electrostatic deviation term derived from the potentiometric titration data (i.e. p(&lt;/span&gt;&lt;i&gt;ΔK&lt;/i&gt;&lt;sub&gt;&lt;i&gt;a&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;)) is used to calculate metal ion concentration at the complexation site on the surface of the polyanion. Intrinsic cobalt-polycarboxylate binding constants (7.5 for PAA and 5.6 for PMA), obtained using this procedure, are consistent with the range of published binding constants for cobalt-monomer carboxylate complexes. In two phase systems incorporation of a Donnan membrane potential term allows determination of the intrinsic p&lt;/span&gt;&lt;i&gt;K&lt;/i&gt;&lt;sub&gt;&lt;i&gt;a&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;&amp;nbsp;of a cross-linked PMA gel, p&lt;/span&gt;&lt;i&gt;K&lt;/i&gt;&lt;sub&gt;&lt;i&gt;a&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;&amp;nbsp;= 4.83, in excellent agreement with the value obtained for the linear polyelectrolyte and the monomer. Similarly, the intrinsic stability constant for cobalt ion binding to a PMA-gel (&lt;/span&gt;&lt;i&gt;β&lt;/i&gt;&lt;sub&gt;CoPMA+&lt;/sub&gt;&lt;span&gt;&amp;nbsp;= 11) was found to be in agreement with the linear polyelectrolyte analogue and the published data for cobalt-carboxylate monodentate complexes.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/0146-6380(84)90116-5</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>Proton and metal ion binding to natural organic polyelectrolytes—I. Studies with synthetic model compounds</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>