RESUMO
The distribution and accumulation of heavy metals in the sediments of two rivers which cross various agglomerations of Tangier city, Morocco, were investigated. Surficial sediment samples were collected during 2005 and characterized for metal content (Zn, Pb, Cd, Cu, Cr and Ni), organic matter, total nitrogen, and n-hexane extractable material (HEM). The organic components (organic carbon, total nitrogen and HEM) show a slightly increasing enrichment from the upstream to the downstream of the emissary. An evaluation of the heavy metal pollution status of both tributaries was carried out using the metal pollution index (MPI). The results revealed the importance of anthropic pressure and the zones influenced by industrial discharges, which keep the metals Pb, Cr and Ni at high levels. Comparison with international regulatory guidelines for sediments revealed serious contamination of Cr, Zn and Ni.
Assuntos
Sedimentos Geológicos/química , Metais Pesados/química , Poluentes Químicos da Água/química , Metais Pesados/análise , Marrocos , Rios , Espectrofotometria AtômicaRESUMO
La colocación de catéteres venosos centrales insertados periféricamente (CVCIP) permite obtener un acceso venoso central evitando las complicaciones asociadas a las punciones de los grandes troncos venosos (neumotórax, hemotórax y punción de grandes vasos arteriales). Aunque se conoce que la inserción de un CVCIP puede producir arritmias cardíacas al contactar la punta del catéter con el tejido cardíaco, apenas existen en la literatura descripciones de arritmias relacionadas con la posición del cuerpo. Se describen dos casos de taquicardias ventriculares posturales secundarias a la colocación de un CVCIP (AU)
