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HIGHLIGHTS

• who: Geochemical balance and colleagues from the (ICP-MS) Agilent Technologies , at the LGqa Laboratory of Geology Department at Universidade Federal de Ouro Preto (DEGEO/UFOP)For total digestion ofof each sample, mL of hydrogen peroxide as added for the removal of organic matter. After total removal of organic matter, they were added , mL of HCl per , mol L , and , mL of , per , mol L, mL of , per , mol L , for digestion of carbonates and oxides and , mL of HF concentrate for digestion of silicates. The percentage of Si, was calculated in a relative way by the . . .
  

   

  

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