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Sunday, November 12, 2006

Nanoscale environments filters.

http://www.youtube.com/watch?v=NdR6uEOenaY


Video Spanish: magneto casero (colocado debajo del rcipiente), moviliza cristales de magnetita.

Powdered mineral, in tiny particles (12 nanometers), similar to iron oxide (rust), could be a cheap and simple method to remove dangerous levels of arsenic of drinkable water, affirmed scientifics of the University of Rice/Houston/Texas. The supplies of water in Bangladesh and the Hindu state of western Bengale, are polluted with arsenic and their inhabitants believe that the one liquidates that they drink is safe. To diminish its arsenic levels would contribute to reduce cancer risks, diabetes, thickening of the skin, liver affections, of the alimentary canal, nervous and auditory disorders in millions of poor from China and southeast asiatic countries. If somebody drinks water with 50 microgramos for liter of arsenic, 1.2% of people could contract cancer, Dr. Dipankar Chakraborti says that he is disagreement with the recommended levels (sure) by the government of Bangladesh: 50 arsenic parts, for million, nevertheless that OMS recommends 10 parts for million, or less. The contamination happens for natural liberated arsenic to the waters for underground rocks, especially the one that comes from Himalaya . Thanks to the nanotechnology, spaces where it is common that the materials exhibit novel behaviors, the investigators created tiny iron oxide crystals (magnetite), of 12 nanometers, level in which magnetite particles can unite up to 100 times but arsenic that particles of more size. Blended with the polluted water, the small crystals covered to the arsenic and behaved as covered with iron, easily removed by industrial and household magnetos. The researchers said that the method was so simple that it would allow to remove polluted water contained in a pail of water, with a simple magneto placed in the bottom of the same one. It would cost "2 cents of dollar to a family of 4 people, Mason B. Tomson, said. Tomsom, engineering teacher in the University of Rice. Tomson added that the process would leave residuals able to fill a pail in one year that the peasants could eliminate in conditioned fields. According to: Alexander Geen, investigator of Lamont-Doherty Earth Observatory in the University of Columbia, they are now about investigating the kindness of magnetite in other minerals: zirconium, aluminum, iron, made up of manganese, etc. And also of exploring other technologies: vegetables that absorb arsenic, special filters of clay, excavation of wells but deep for extraction of water, free of arsenic.

Anticontaminantes, a nanoescala.

Mineral en polvo, en forma de pequeñisimos cristales (12 nanometros), similares al oxido de hierro (magnetita), podrian ser un método barato y simple para remover niveles peligrosos de arsénico del agua bebible, afirmaron cientificos de la Universidad de Rice/Houston/Texas. Los suministros de agua en Bangladesh y el estado hindu de Bengala occidental, estan contaminadas con arsénico y sus habitantes creen que el liquido que beben es seguro. Disminuir sus niveles de arsénico contribuiria a reducir riesgos de cancer, diabetes, engrosamiento de la piel, afecciones hepaticas, del tubo digestivo, desordenes nerviosos y problemas auditivos, en millones de pobres de China y paises del suroeste asiatico. Si alguien bebe en forma prolongada agua con 50 microgramos por litro de arsénico, 1.2% de personas podrian contraer cancer, dice el Dr. Dipankar Chakraborti, quien ademas esta en desacuerdo con los niveles recomendados (seguros) por el gobierno de Bangladesh :50 partes de arsénico, por millon, no obstante que la OMS recomienda 10 partes por millon, o menos. La contaminación ocurre por arsénico natural liberado a las aguas por rocas subterraneas, especialmente la que proviene del Himalaya. Gracias a la nanotecnologia, espacios donde es comun que los materiales exhiban novedosas conductas, los investigadores crearon cristales de oxido de magnetita de 12 nanometros, nivel en el que las particulas de magnetita pueden unir hasta 100 veces mas arsenico que particulas de mayor tamaño. Mezclados con el agua contaminada, los pequeños cristales cubrieron al arsénico y se comportaron como cubiertas de hierro, fácilmente removidas por magnetos industriales y caseros. Los investigadores dijeron que el metodo era tan sencillo que permitiria remover agua contaminada contenida en un balde de agua, con un magneto simple colocado en el fondo del mismo..“le costaria 2 centavos de dólar a una familia de 4 personas,” dijo Mason B. Tomson, profesora de ingenieria en la Universidad de Rice. Tomson añadio que el proceso dejaria residuos capaces de llenar un balde en un año que los campesinos podrian eliminar en campos acondicionados. Según :Alexander van Geen, investigador del Lamont-Doherty Earth Observatory en la Universidad de Columbia, ahora se trata de investigar las bondades de la magnetita con otros minerales : zirconio, aluminio, hierro, compuestos de manganeso,etc. Y tambien de explorar otras tecnologiaas : vegetales que absorban arsénico, filtros especiales de arcilla, excavación de pozos mas profundos para extracción de agua, libres de arsénico.

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