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Who formed the national farm workers association of 1962

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En una misma muestra analizada por espectrofotometría de absorción atómica, se puede determinar:a) solamente un metal en cada muestra.b) solamente se pueden determinar vapores orgánicos.c) el número de metales que permite determinar está condicionado por la cantidad ( el volumen) de la disolución que contiene las muestras y la dotación de lámparas disponibles.d) sólo permite determinar más de un metal mediante la técnica de espectrofotometría de emisión atómica.
El ciclón es un componente del equipo de toma de muestras para polvo respirable y complementa:a) el tubo absorbente.b) el filtro para retención de materia particulada.c) el monitor pasivo.d) no necesita ningún otro complemento, se determina la fracción respirable que queda retenida en el ciclón.
En un ambiente de humos de soldadura se decide la aplicación de EPI de protección respiratoria pues la concentración determinada para los soldadores como valor medio es de 9 mh/m3 (VLA-ED par humos de soldadura, 5mg/m3):a) se establece la necesidad de máscara completa y filtro P3.b) se plantea la instalación de una red de aire tratado para alimentar los EPI de protección respiratoria de equipo de soldadores.c) se considera suficiente la dotación y uso de protección respiratoria formada por mascarilla y filtro con un factor de protección 2.d) se considera correcta la respuesta anterior si se necesita y se adopta después de que haya sido instalado un sistema de captación localizada de los humos producidos.

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