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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="/styles/mix-twbs.min.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=/graphics/millironx.svg>
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&emsp; 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></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
microorganisms may be a promising remediation method, however metabolism of TCE
results in acid buildup, which consequently impedes the ability of
microorganisms to perform this remediation. Polyvinylalginate (PVA) shows
promise as a useful shield for microorganisms carrying out bioremediation of TCE
by surrounding them in a protective biofilm-like layer, however, key information
is missing which relates diffusion of TCE or its metabolic products through PVA.
To measure the effective diffusion coefficient of H<sup>+</sup>
ions through
a PVA membrane cross-linked with boric acid and calcium ions, we used a modified
diaphragm cell. We found the effective diffusion coefficient to be 1.40 ×
10<sup>-5</sup>
± 1.91 × 10<sup>-6</sup>
cm<sup>2</sup>
s, a nearly
seven-fold decrease in diffusivity compared to protons in water, with an
unexpected significant but as of yet unquantified adsorption capacity. These
results suggest that polyvinylalginate is effective in slowing diffusion of
protons and buffering these acids produced by trichloroethylene metabolism, and
remains suitable for encapsulation of microorganisms involved in bioremediation.</p></div></section><footer class=fixed-bottom><div class="container-fluid footer-contents"><div class="row justify-content-between"><div class="col-3 align-self-center"><img src=/graphics/brandedbull.min.svg height=95rem></div><div class="col-3 align-self-center"><div class="btn-group float-end" role=group aria-label="Other Milliron X sites"><a class="btn btn-outline-primary btn-sm" href=https://video.millironx.com/ data-bs-toggle=tooltip title="Video (Peertube)"><i class="fax fa-peertube fa-fw"></i></a>
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