chemical leaching minerals

Platinum group | chemical element group | Britannica.com- chemical leaching minerals , · …the elements listed above, the platinum group also includes rare mineral alloys such as iridosmine. The members of this group are harder than the metals of the gold group and also have higher melting points.…Chemical speciation: an instrument for evaluation of ...ABSTRACT. Chemical speciation allows knowing the the different chemical forms of metals in a sample. Sequential extraction procedures are used to evaluate the fractionation of the metals in …