[Content and fractionation of Cu - Cr - Ni and Zn in montmorillonitic and allophanic soils. Comparison between two different extraction procedures] | Contenido y fraccionamento de Cu - Cr - Ni y Zn en suelos montmorilloniticos y alofanicos. Comparacion entre dos diferentes procedimientos de extraccion

acque reflue aguas residuales analytical methods chile chili chrome chromium cile cinc cobre contenido mineral copper cromo cuivre irrigation irrigazione metodi analitici mineral content montmorillonitic soils nichel nickel rame riego suoli montmorillonitici technique analytique wastewater zinc zinco