Evaluación de la movilidad del ácido 2,4-diclorofenoxiacético en suelos ándicos del departamento del Cauca, Colombia

El herbicida ácido 2,4 - diclorofenoxiacético (2,4-D) es un ácido selectivo y sistémico que, desde 1940, es ampliamente utilizado en suelo agrícolas, de todo el mundo. Su uso radica a su selectividad entre la vegetación de hoja ancha y cultivos de gramíneas y como regulador del crecimiento vegetal; sin embargo, este herbicida se puede acumular en el ambiente y, adicionalmente, puede ser transportado por lixiviación, a través del suelo, llegando a contaminar aguas subterráneas, lo que genera un alto riesgo para el ambiente y la salud del ser humano. El estudio de la movilidad del 2,4-D en suelos con alto contenido de materia orgánica permitió conocer, que no solo la materia orgánica se correlaciona indirectamente con la movilidad de este compuesto, sino que, también, influye la humedad, al reducir la lixiviación y el potencial de contaminación del recurso hídrico subterráneo, mientras que la conductividad hidráulica se relaciona, de manera directa, con la lixiviación de este herbicida.

The herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) is a selective and systemic acid that has been widely used in agricultural soils since 1940. Its use lies in its selectivity between broadleaf vegetation and grass crops, and as a regulator of plant growth. However, this herbicide can accumulate in the environment, and additionally, it can be transported by leaching through the soil, contaminating groundwater, which generates a high risk for the environment and human health. In this study, the mobility of 2,4-D in organic-matter-rich soils was assessed. The results revealed that not only the organic material is indirectly correlated with the mobility of this compound but also influences humidity and reduces leaching and potential pollution of groundwater resources, whereas hydraulic conductivity is directly related to herbicide leaching.

Heavy metals content in soils and cocoa tissues in Magdalena department Colombia: emphasis in cadmium / Contenido de metales pesados en suelos y tejidos de cacao en el departamento del Magdalena, Colombia: énfasis en cadmio / Teor de metais pesados em solos e tecidos de cacau no departamento de Magdalena, Colômbia: ênfase no cádmio

ABSTRACT Cocoa (Theobroma cacao L.) is a species originating from the humid tropics. Over 70,000 km2 worldwide is dedicated to growing cocoa, and approximately 30% of its global production is concentrated in the equatorial regions of Central and South America, the Antilles and tropical Asia. The demand for cocoa is growing significantly but the presence of cadmium (Cd) in the species is a potential problem limiting its commercialization. The present study determined the Cd, Ni, Pb and Cr content in two cocoa-producing regions in northern Colombia. Foliage (leaf, bean and shell) and soil were analyzed. The mean Ni, Pb and Cr content in the plant tissue did not exceed the maximum permissible limits set by the United States Environmental Protection Agency (EPA). The mean Cd content in the beans was 0.51 mg kg-1 in region 1 and 0.66 mg kg-1 in region 2, which are considered risky per reports from the European Union and restrict the product's export. These results serve as a reference for future research on cocoa.

RESUMEN El cacao (Theobroma cacao L.) es una especie originaria de los trópicos húmedos. Más de 70,000 km2 en todo el mundo están dedicados a su cultivo y aproximadamente el 30% de su producción mundial se concentra en las regiones ecuatoriales de América Central y del Sur las Antillas y Asia tropical. La demanda de cacao está creciendo significativamente, pero la presencia de cadmio (Cd) en la especie es un problema potencial que limita su comercialización. El presente estudio determinó el contenido de Cd, Ni, Pb y Cr en dos regiones productoras de cacao en el norte de Colombia. Se analizaron el tejido (hoja, frijol y cáscara) y el suelo. El contenido medio de Ni, Pb y Cr en el tejido vegetal no excedió los límites máximos permisibles establecidos por la Agencia de Protección Ambiental (EPA) de los Estados Unidos. El contenido medio de Cd en los frijoles fue de 0,51 mg kg-1 en la región 1 y 0,66 mg kg-1 en la región 2, que se consideran riesgosos según los informes de la Unión Europea y restringen la exportación del producto. Estos resultados sirven como referencia para futuras investigaciones sobre el cacao.

RESUMO O cacau (Theobroma cacao L) é uma espécie originária dos trópicos úmidos. Mais de 70.000 km2 em todo o mundo são dedicados à sua cultura e aproximadamente 30% de sua produção global está concentrada nas regiões equatoriais da América Central e do Sul, Antilhas e Ásia tropical. A demanda por cacau está crescendo significativamente, mais a presença de cádmio (Cd) nas espécies é um problema potencial que limita sua comercialização. O presente estudo determinou o teor de Cd, Ni, Pb e Cr em duas regiões produtoras de cacau no norte da Colômbia. A folhagem (folha, feijão e casca) e o solo foram analisados. O teor médio de Ni, Pb e Cr no tecido vegetal não excedeu os límites máximos permitidos estabelecidos pela Agência de Proteção Ambiental dos Estados Unidos (EPA). O conteúdo médio de Cd nos grãos foi de 0,51 mg kg-1 na região 1 e 0,66 mg kg-1 na região 2, que são considerados de risco por relatórios da União Europeia e restringem a exportação do produto. Esses resultados servem como referência para futuras pesquisas sobre cacau.

Identification of enteroparasites in recreation areas of elementary schools in Northern Espírito Santo, Brazil / Identificación de enteroparásitos en áreas de recreación de escuelas primarias en el norte de Espirito Santo, Brasil

ABSTRACT Objective Since sand is an important child means of contagion by enteroparasites, this study aimed to conduct a parasitological evaluation in recreation areas of elementary schools and early childhood education centers, in São Mateus-ES. Material and Methods Sand samples were collected in seven municipal elementary schools and in a municipal kindergarten and nursery center. For the recovery of helminth eggs and protozoan cysts, flotation and spontaneous sedimentation techniques were used. Results It was found that 77 % of the analyzed institutions were positive for helminth eggs and larvae. Among the eggs and larvae identified, the main were Ascaris lumbricoides and Toxocara canis. Pearson's chi-square test identified the best results when using the spontaneous sedimentation method. Conclusions Considering that individuals, especially children living in poor sanitation conditions, are more prone to enteroparasites, studies point to the need of the application of preventive and health education measures for the population enrolled in municipal schools in São Mateus.(AU)

RESUMEN Objetivo Dado que la arena es un medio importante de contagio infantil por enteroparásitos, este estudio tuvo como objetivo realizar una evaluación parasitológica en áreas recreativas de escuelas primarias y centros de educación infantil, en São Mateus-ES. Materiales y Métodos Se tomaron muestras de arena en siete escuelas primarias municipales, en un jardín de infantes y en una guardería municipal. Para la recuperación de huevos de helmintos y quistes de protozoos, se usaron las técnicas de flotación y de sedimentación espontánea. Resultados Se encontró que el 77 % de las instituciones analizadas dieron positivo para huevos y larvas de helmintos. Entre los huevos y larvas identificados los principales fueron Ascaris lumbricoides y Toxocara canis. La prueba de ji-cuadrado de Pearson identifica los mejores resultados cuando se usa el método de sedimentación espontánea. Conclusión Teniendo en cuenta que las personas, especialmente los niños que viven en malas condiciones de saneamiento, son más propensas a enteropatías, los estudios apuntan a la necesidad de la aplicación de medidas preventivas y de educación sanitaria para la población inscrita en las escuelas municipales de São Mateus.(AU)

Inter-relações ambiente e saúde no uso de poços oficiais para consumo humano em áreas de contaminação dos recursos hídricos subterrâneos / Environment and health interrelations in the use of official wells for human consumption in areas of contamination of groundwater resources

RESUMO O presente artigo aborda o uso de fontes alternativas de abastecimento no município de São Paulo, com objetivo de analisar como a desregulamentação do setor poderá oferecer riscos à saúde da população, avaliar custos incorridos no saneamento nessas áreas e estimar custos que possam ocorrer no Sistema Único de Saúde (SUS). Foi feita revisão bibliográfica e projeção econométrica do impacto das doenças de veiculação hídrica no orçamento do SUS. Resultados demonstraram que, para cada 1.000 m3 de outorga concedida, serão 3.320 usuários em situação de vulnerabilidade, cujos subsídios foram sonegados, gerando custo social, déficit na universalização do saneamento e necessidade de criação de 180 leitos no SUS.

ABSTRACT This article discusses the use of alternative sources of water supply in São Paulo, aiming to analyze how deregulation may present a risk to public health and sanitation costs incurred to evaluate these areas and to estimate costs that may occur in the Unified Health System (SUS). Literature review and projection of the impact of waterbome diseases in the SUS budget were performed. Results showed that for every 1,000 m3 of water right concession, will be awarded 3,320 users in vulnerable situations, whose allowances were withheld, generating social cost, universal deficit in sanitation and the need to create 180 beds in the SUS.

Inter-relações ambiente e saúde no uso de poços oficiais para consumo humano em áreas de contaminação dos recursos hídricos subterrâneos / Environment and health interrelations in the use of official wells for human consumption in areas of contamination of groundwater resources

RESUMO O presente artigo aborda o uso de fontes alternativas de abastecimento no município de São Paulo, com objetivo de analisar como a desregulamentação do setor poderá oferecer riscos à saúde da população, avaliar custos incorridos no saneamento nessas áreas e estimar custos que possam ocorrer no Sistema Único de Saúde (SUS). Foi feita revisão bibliográfica e projeção econométrica do impacto das doenças de veiculação hídrica no orçamento do SUS. Resultados demonstraram que, para cada 1.000 m3 de outorga concedida, serão 3.320 usuários em situação de vulnerabilidade, cujos subsídios foram sonegados, gerando custo social, déficit na universalização do saneamento e necessidade de criação de 180 leitos no SUS.

ABSTRACT This article discusses the use of alternative sources of water supply in São Paulo, aiming to analyze how deregulation may present a risk to public health and sanitation costs incurred to evaluate these areas and to estimate costs that may occur in the Unified Health System (SUS). Literature review and projection of the impact of waterbome diseases in the SUS budget were performed. Results showed that for every 1,000 m3 of water right concession, will be awarded 3,320 users in vulnerable situations, whose allowances were withheld, generating social cost, universal deficit in sanitation and the need to create 180 beds in the SUS.

Assessment of Heavy Metal Pollution Using Potential Ecological Risk Indexes in the Shen-Fu Sewage Irrigation Regions / 环境与健康杂志

Cr. The potential ecological risk index of the whole regions had reached the middle level,and that of Hg had already reached the degree of strong hazard. Conclusion The long-term sewage irrigation has caused serious heavy metals pollution in the soil of irrigation regions.

Distribution of Cadmium and Lead in Soil and Rice Along Road Polluted by Traffic Exhaust / 环境与健康杂志

coarse polished rice for lead respectively. Positive correlations were observed in contents of cadmium and lead between soil and rice (r=0.942～0.994, P

Relationship Between the Contents of Arsenic, Chromium and Lead in the Flowers of Robinia pseudoacacia L and the Soil Sown to Them in Urban Area of Qingdao / 环境与健康杂志

Objective To study the relationship between the contents of arsenic, chromium and lead in the flowers of Robinia pseudoacacia L and soil sown to them in urban area of Qingdao. Methods The flowers of Robinia pseudoacacia L and soil, where they grew, were sampled for analysis in different quarters in urban area of Qingdao in May,2001. Results The sanitary qualities of the soil samples all maintained Grade 1, no one of the samples exceeded the related national sanitary standards for the contents of arsenic, chromium and lead in soil. Based on the national standards for As, Cr and Pb in food, the As contents in the sampled flowers of Robinia pseudoacacia L were all below the related national standard. The Cr contents in the flower samples exceeding the standard were only found in industrial quarter. The Pb contents in all flower samples exceeded the standard. Conclusion The low contents of Cr and Pb in flower samples were associated with those in the soil sown to Robinia pseudoacacia L and other environmental factors in a certain degree.