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1.
Rev. toxicol ; 35(1): 11-17, 2018. tab, graf
Artigo em Espanhol | IBECS | ID: ibc-176860

RESUMO

El arsénico es muy estudiado a nivel mundial, es altamente toxico en especial en su forma inorgánica arseniato [As(V)] y arsenito [As(III)]. El hombre se encuentra expuesto al arsénico principalmente mediante el agua de consumo y la dieta. El objetivo del trabajo fue determinar la bioaccesibilidad de arsénico en alimentos cocinados en una región endémica Chacosantiagueña de Argentina y estudiar la ingesta diaria en una población infantil y adulta a partir del arsénico bioaccesible cuantificable en los alimentos. Para la cuantificación de As-i bioaccesible se siguió el método in vitro de simulación del proceso de digestión gastrointestinal en sus dos etapas (gástrica e intestinal). Para el cálculo de la fracción bioaccesible se cuantificó el Arsénico luego del proceso de digestión gastrointestinal simulado y este valor corresponde al % de bioaccesibilidad con respecto al Arsénico cuantificado antes del proceso y que constituye el 100%. Para los mates y leches se consideró la totalidad del arsénico como inorgánico puesto que en el agua, éste es la principal especie. Los resultados muestran que el arsénico bioaccesible tiene valores entre 62,7-78 %, siendo el promedio 70,6%. Los rangos de las ingestas calculadas para la población infantil fueron de 11,3 a 350,9 µg/kgpc/día, mientras que en la población adulta fueron entre 5 a 30,2 µg/kgpc/día. La población infantil es la más expuesta al arsénico mediante la dieta


Arsenic is very studied worldwide, it is highly toxic especially in its inorganic form arsenate [As (V)] and arsenite [As (III)]. Man is exposed to arsenic mainly through drinking water and diet. The objective of the work was to determine the bioavailability of arsenic in cooked foods in a Chacosantiagueña endemic region of Argentina and to study the daily intake in a child and adult population from quantifiable bioavailable arsenic in foods. To calculate the bioaccessible fraction, Arsenic was quantified after the simulated gastrointestinal digestion process and this value corresponds to the% of bioavailability with respect to Arsenic quantified before the process and which constitutes 100%. For mates and milks the totality of arsenic was considered as inorganic since in water, this is the main species. The results show that bioaccessible arsenic has values between 62.7-78%, with an average of 70.6%. The ranges of the intakes calculated for the infant population were from 11.3 to 350.9 μg / kgpc / day, while in the adult population they were between 5 to 30.2 μg / kgpc / day. The infant population is the most exposed to arsenic through diet


Assuntos
Humanos , Criança , Adulto , Arsênico/isolamento & purificação , Intoxicação por Arsênico/epidemiologia , Exposição a Produtos Químicos , Argentina/epidemiologia , Disponibilidade Biológica , Composição de Alimentos , Características da Água/análise
2.
Int. microbiol ; 18(3): 141-149, sept. 2015. ilus, tab, ^graf
Artigo em Inglês | IBECS | ID: ibc-152254

RESUMO

More than 50% of the world’s population lives in urban centers. As collection basins for landscape activity, urban waters are an interface between human activity and the natural environment. The microbiome of urban waters could provide insight into the impacts of pollution, the presence of human health risks, or the potential for long-term consequences for these ecosystems and the people who depend upon them. An integral part of the urban water cycle is sewer infrastructure. Thousands of miles of pipes line cities as part of wastewater and stormwater systems. As stormwater and sewage are released into natural waterways, traces of human and animal microbiomes reflect the sources and magnitude of fecal pollution and indicate the presence of pollutants, such as nutrients, pathogens, and chemicals. Non-fecal organisms are also released as part of these systems. Runoff from impervious surfaces delivers microbes from soils, plants and the built environment to stormwater systems. Further, urban sewer infrastructure contains its own unique microbial community seemingly adapted to this relatively new artificial habitat. High microbial densities are conveyed via pipes to waterways, and these organisms can be found as an urban microbial signature imprinted on the natural community of rivers and urban coastal waters. The potential consequences of mass releases of non-indigenous microorganisms into natural waters include creation of reservoirs for emerging human pathogens, altered nutrient flows into aquatic food webs, and increased genetic exchange between two distinct gene pools. This review highlights the recent characterization of the microbiome of urban sewer and stormwater infrastructure and its connection to and potential impact upon freshwater systems (AU)


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Assuntos
Humanos , Microbiota , Água Potável/microbiologia , Características da Água , Saúde Pública , Abastecimento de Água , Purificação da Água , 24961
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