545.8 San C2 Sandell, Ernest Birger, 1906- Colorimetric determination of traces of metals. 3d. ed., rev. and enlarged. New York, Interscience Pub., 1959. 1032 p. ilus., diagrs. 24 cm. (Chemical analysis, a series of monographs on analitical chemistry and its application, vol.3) Notas bibliográficas al pie de las páginas.