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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 Trichlorethylene Breakdown Products in Polyvinylalginate - MillironX</title><link href="https://millironx.com/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=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>AIChE Annual Meeting: Pittsburgh, Pennsylvania</h5><h2>Measuring Diffusion of Trichlorethylene Breakdown Products in Polyvinylalginate</h2><h3><small><ul class=list-inline><li class=list-inline-item>Thomas A. Christensen II</li><li class=list-inline-item>Samuel R. Wolfe</li><li class=list-inline-item>Jonathan Counts</li><li class=list-inline-item>Mark F. Roll</li><li class=list-inline-item>Kristopher V. Waynant</li><li class=list-inline-item>James G. Moberly</li></ul></small></h3><h4>October 29, 2018</h4><p>Trichloroethylene (TCE), a toxic and carcinogenic contaminant, presents unique
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challenges for cleanup because of its water solubility, density, and volatility.
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Bioremediation of TCE is a promising cleanup method; however, metabolism of TCE
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results in acid generation that inhibits remediating microorganisms. Calcium
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alginate(CA)-polyvinylalcohol (PVA) hydrogels show promise for protecting
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remediating microbes, however diffusion of TCE or its byproducts through these
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polymers is unknown. To measure the effective diffusion coefficient of TCE and
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byproducts through hydrogel membranes, we used a modified diaphragm cell.
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Measured effective diffusion coefficient of each species was (cm <sup>2</sup>
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/s
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× 10<sup>6</sup>
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): 14.0 ± 1.91 for H<sup>+</sup>
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ions, 12.4 ± 1.64 for TCE,
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7.83 ± 0.54 for cis-1,2-dichloroethylene (DCE), and 4.68 ± 4.14 for vinyl
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chloride. These results aid in engineering biobeads and suggest that CA-PVA
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hydrogel blends are effective in slowing diffusion of protons, buffering acids
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produced by trichloroethylene metabolism, and remains suitable for encapsulation
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of microorganisms involved in bioremediation.</p><div class="card border-dark m-3 p-3"><a href=/academia/pva-aiche/measuring_diffusion_of_trichloroethylene.pdf>/academia/pva-aiche/measuring_diffusion_of_trichloroethylene.pdf</a>
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