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<!doctype html><html class=no-js lang=en><head><meta charset=utf-8><meta http-equiv=x-ua-compatible content="ie=edge"><meta name=viewport content="width=device-width,initial-scale=1"><title>Measuring diffusion of protons in polyvinyalginate - MillironX</title><link href="https://millironx.com/css/bundle.min.d68b6135772e7077b2931ddcfac9fc4cdb0643d18a59b24d9311ef9e5196126a.css" rel=stylesheet></head><body><div class=container-fluid><div class="row wrapper min-vh-100 flex-column flex-sm-row"><aside class="col-12 col-md-3 p-0 bg-dark flex-shrink-1"><nav class="navbar navbar-expand-md navbar-dark bg-dark align-items-start flex-md-column flex-row"><div class=container-fluid><a class="navbar-brand d-block d-md-none" href=#><object class="d-inline-block align-text-top" width=80 height=24 style=filter:invert(100%) data=https://millironx.com/graphics/millironx.svg>
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  Milliron X</h1></header></div><section class="container-fluid list-main"><div class="container px-5"><h5>Idaho INBRE Summer Research Conference: Moscow, Idaho</h5><h2>Measuring diffusion of protons in polyvinyalginate</h2><h3><small><ul class=list-inline><li class=list-inline-item>Thomas A. Christensen II</li><li class=list-inline-item>Jonathan Counts</li><li class=list-inline-item>James G. Moberly</li></ul></small></h3><h4>July 31, 2018</h4><p>Trichloroethylene (TCE) is a toxic and carcinogenic contaminant that presents
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unique challenges for cleanup because of its density and volatility. Use of
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microorganisms may be a promising remediation method, however metabolism of TCE
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results in acid buildup, which consequently impedes the ability of
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microorganisms to perform this remediation. Polyvinylalginate (PVA) shows
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promise as a useful shield for microorganisms carrying out bioremediation of TCE
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by surrounding them in a protective biofilm-like layer, however, key information
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is missing which relates diffusion of TCE or its metabolic products through PVA.
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To measure the effective diffusion coefficient of H<sup>+</sup>
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ions through
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a PVA membrane cross-linked with boric acid and calcium ions, we used a modified
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diaphragm cell. We found the effective diffusion coefficient to be 1.40 ×
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10<sup>-5</sup>
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± 1.91 × 10<sup>-6</sup>
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cm<sup>2</sup>
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s, a nearly
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seven-fold decrease in diffusivity compared to protons in water, with an
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unexpected significant but as of yet unquantified adsorption capacity. These
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results suggest that polyvinylalginate is effective in slowing diffusion of
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protons and buffering these acids produced by trichloroethylene metabolism, and
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remains suitable for encapsulation of microorganisms involved in bioremediation.</p></div></section></main></div></div><script src=https://millironx.com/js/fontawesome.min.aaac087effe105b2021e36c0792fad5ba9e850de51c098f2e6db8ff3e29f8d01.js></script>
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