toward march 1970 up to may 1972 it was monthly measured the radium quantity, available in, tehran milk, fortunate1y the results were in accordance to a reasonable value. the only remarkable point was that in wintertime, the indio activity decreased to minimum of 0.02 pci/lit, and in spring time it went up to a maxi­mum of 0.09 pci/lit. the next note worthy point was observed in a special conta...

The aim of this work was to identify the natural breeding sites of sandflies in the province of Chaco, Argentina, for the first time. Preliminary studies were conducted in two different phytogeographic regions: dry Chaco (Parque Provincial Pampa del Indio), in January 2010, and humid Chaco (Resistencia, Margarita Belén and Colonia Benítez), from May-September 2010. A total of 127 samples were c...

This contribution analyzes water chemical data for the Choapa basin, North Central Chile, for the period 1980-2004. The parameters considered are As, Cu Fe, pH, EC, SO₄⁻², Cl⁻¹, and HCO[Formula: see text], from samples taken in nine monitoring stations throughout the basin. Results show rather moderate contents of As, Cu, and Fe, with the exception of the Cuncumén River and the Aucó creek, expl...

La jarosita es producida en la naturaleza ambientes húmedos presencia de sulfuros; además forma precipitado algunos procesos metalúrgicos como método tratamiento algunas soluciones para el control hierro presente las ácidas; formado tiene contenidos metales interés oro, plata, y indio. En este trabajo se presenta efecto del pH, concentración pirofosfato tiempo lixiviación con finalidad recupera...