News Column

New Arsenic Findings from Rice University Discussed (Arsenic Removal by Nanoscale Magnetite in Guanajuato, Mexico)

August 18, 2014



By a News Reporter-Staff News Editor at Clinical Trials Week -- Fresh data on Arsenic are presented in a new report. According to news reporting originating in Houston, Texas, by NewsRx journalists, research stated, "Increasingly, cities in Latin America are recognizing the importance of drinking water quality on public health. A water assessment of Guanajuato, Mexico, and surrounding areas indicated naturally occurring arsenic in some wells above the Mexican drinking water standard of 25 mu g/L and the World Health Organization recommendation of 10 mu g/L."

The news reporters obtained a quote from the research from Rice University, "This initiated a collaborative effort with the city to evaluate a new arsenic removal method using high surface area magnetite sorbents. Nanoscale (20 nm) magnetite particles, previously shown to effectively adsorb arsenic in batch systems, were packed in sand columns to create a continuous treatment process. Design and operating variables were evaluated to confirm that magnetite-to-sand ratio and residence time most significantly affected arsenic breakthrough profiles. Subsequently, a pilot column with 456 g (ca. $2.50 USD) of a commercially available, food-grade magnetite (98 nm effective particle diameter) from a pigment manufacturer demonstrated removal of the equivalent arsenic contained in 1,360 L of Guanajuato groundwater. Although pH reduction dramatically improved arsenic adsorption in batch isotherms, no improvement in arsenic removal efficiency was observed when applied to pilot-scale, field columns in Guanajuato. Interference effects (e. g., from background silica) and changes to surface species over time may impact adsorption differently in column versus batch systems."

According to the news reporters, the research concluded: "Overall, this work represents one of the first pilot studies of a nanotechnology-enabled water treatment system, and it demonstrates the potential and additional challenges for taking nanoscale magnetite or other highly researched nanomaterials into a complex full-scale setting."

For more information on this research see: Arsenic Removal by Nanoscale Magnetite in Guanajuato, Mexico. Environmental Engineering Science, 2014;31(7):393-402. Environmental Engineering Science can be contacted at: Mary Ann Liebert, Inc, 140 Huguenot Street, 3RD Fl, New Rochelle, NY 10801, USA. (Mary Ann Liebert, Inc. - www.liebertpub.com; Environmental Engineering Science - www.liebertpub.com/overview/environmental-engineering-science/15/)

Our news correspondents report that additional information may be obtained by contacting J.W. Farrell, Rice University, Dept. of Chem & Biomol Engn, Houston, TX, United States. Additional authors for this research include J. Fortner, S. Work, C. Avendano, N.I. Gonzalez-Pech, R.Z. Araiza, Q.L. Li, P.J.J. Alvarez, V. Colvin, A. Kan and M. Tomson (see also Arsenic).

Keywords for this news article include: Texas, Houston, Arsenic, Nanoscale, United States, Nanotechnology, Emerging Technologies, North and Central America

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Clinical Trials Week


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