Estudio del contenido natural de fluor en aguas de consumo humano de Nicaragua PDF Download

Author: Nicaragua. Ministerio de Salud
Publisher:
ISBN:
Category :
Languages : es
Pages : 27

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Book Description
Presenta un estudio del contenido natural de fluor en aguas y la sal de consumo humano de Nicaragua. Comprende un estudio epidemiologico de salud bucal en ninos de 6 a 15 anos y fluorosis. Estudio de excrecion de fluor en la orina de ninos de 3-5 anos y estudio de consumo de pastas dentales y suplementos fluorados.

Author: Oswaldo Ruiz Merino
Publisher:
ISBN:
Category :
Languages : es
Pages : 13

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Author: Organizacion Panamericana de la Salud. Division de Desarrollo de Sistemas y Servicios de Salud. Programa Regional de Salud Oral
Publisher:
ISBN:
Category :
Languages : es
Pages : 13

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Author: Agustín Montiel Cota
Publisher: Eae Editorial Academia Espanola
ISBN: 9783659064845
Category :
Languages : es
Pages : 68

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Book Description
En regiones aridas de Mexico, donde el agua es escasa y se extrae de pozos profundos, el exceso de concentracion de fluor de forma natural en el agua para consumo humano, ha provocado un problema de salud publica, la fluorosis dental. La Ciudad de Hermosillo, Sonora presenta riesgo en zonas donde la concentracion de fluor en agua potable es muy alta, con valores hasta 7.8 mgL-1, el contenido maximo por normatividad debe ser 1.5 mgL-1. Ante la necesidad de eliminar el exceso de fluor, se planteo como alternativa el uso de zeolitas naturales, minerales abundantes y disponibles en el Estado de Sonora, con bajo costo. En este estudio, se propone tratamiento de acidificacion a las zeolitas para mejorar adsorcion de fluoruros, asi como condiciones de operacion para eliminar o alcanzar la concentracion optima de fluor en agua potable. Por lo tanto, se espera que las Instituciones gubernamentales unifiquen criterios sobre presencia de fluoruros en el agua potable que se abastece para consumo humano, para evitar riesgos a la salud especialmente en la poblacion infantil."

Author: Sudhakar Srivastava
Publisher: Springer
ISBN: 9811385874
Category : Technology & Engineering
Languages : en
Pages : 466

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Arsenic contamination poses a major environmental problem, especially in Southeast Asian countries like Bangladesh and India. Threatening the health of millions of people due to arsenic’s toxicity and carcinogenicity, the major routes of arsenic exposure for humans are either through drinking water or crops. Rice is the crop most affected by arsenic owing to its cultivation in major arsenic contaminated areas, biogeochemical factors in the soil during rice growth, and specific features of rice that enable it take up more arsenic than other crop plants. This book addresses the problem of arsenic by pursuing a holistic approach. It presents the status quo in different parts of the world (North and South America, Europe, Asia, etc.) and provides essential information on food-related arsenic exposure risks for humans, and possible preventive and curative measures for tackling arsenic poisoning. It covers the arsenic contamination status of rice, rice-based products, other vegetables, fishes, mushrooms, and other foods, with a special focus on rice-arsenic interactions. The mechanisms of arsenic uptake, translocation and distribution in plants and grains are also explained. In closing, the book reviews a variety of prospective agronomic and biotechnological solutions to the problem of arsenic accumulation in rice grains. The book is intended for a broad audience including researchers, scientists, and readers with diverse backgrounds including agriculture, environmental science, food science, environmental management, and human health. It can also be used as an important reference guide for undergraduate and graduate students, university faculties, and environmentalists.

Author: National Research Council
Publisher: National Academies Press
ISBN: 0309076293
Category : Nature
Languages : en
Pages : 242

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Book Description
Having safe drinking water is important to all Americans. The Environmental Protection Agency's decision in the summer of 2001 to delay implementing a new, more stringent standard for the maximum allowable level for arsenic in drinking water generated a great deal of criticism and controversy. Ultimately at issue were newer data on arsenic beyond those that had been examined in a 1999 National Research Council report. EPA asked the National Research Council for an evaluation of the new data available. The committee's analyses and conclusions are presented in Arsenic in Drinking Water: 2001 Update. New epidemiological studies are critically evaluated, as are new experimental data that provide information on how and at what level arsenic in drinking water can lead to cancer. The report's findings are consistent with those of the 1999 report that found high risks of cancer at the previous federal standard of 50 parts per billion. In fact, the new report concludes that men and women who consume water containing 3 parts per billion of arsenic daily have about a 1 in 1,000 increased risk of developing bladder or lung cancer during their lifetime.

Author: International Atomic Energy Agency
Publisher:
ISBN:
Category : Radioisotopes in hydrology
Languages : en
Pages : 244

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Author: Rafael Lira
Publisher: Springer
ISBN: 1461466695
Category : Science
Languages : en
Pages : 562

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Book Description
This book reviews the history, current state of knowledge, and different research approaches and techniques of studies on interactions between humans and plants in an important area of agriculture and ongoing plant domestication: Mesoamerica. Leading scholars and key research groups in Mexico discuss essential topics as well as contributions from international research groups that have conducted studies on ethnobotany and domestication of plants in the region. Such a convocation will produce an interesting discussion about future investigation and conservation of regional human cultures, genetic resources, and cultural and ecological processes that are critical for global sustainability.

Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 100

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Author: Jochen Bundschuh
Publisher: CRC Press
ISBN: 0415407710
Category : Science
Languages : en
Pages : 784

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Book Description
Groundwater resources naturally contain high levels of arsenic in many parts of the world. Over the last two decades, the As-containing groundwater in South-East Asia has received much attention, but the situation is just as crucial in Latin America, where the number of studies is still relatively low, and the extent and severity of As-exposure in the populations has yet to be fully evaluated. This book aims to promote knowledge of the occurrence and genesis of As-rich groundwater in Latin America. It deals with constraints on the mobility of As in groundwater, As-uptake from soil and water by plants, As-propagation through the food chain, human health impacts, and As-removal technologies. Case studies are presented from Argentina, Bolivia, Chile, Ecuador, El Salvador, Mexico, Nicaragua and Peru, amongst others, and are viewed against the background of experience from other world regions. The book is a state-of-art overview of arsenic research in Latin America. It aims to create interest within the Latin American countries affected by the presence of arseniferous aquifers and to increase awareness among administrators, policy makers and company executives. It will also serve to inform the international scientific community, and improve international cooperation on arsenic in groundwater.