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Potentiometric studies in borax I Fe+2-Fe+3-Pt and sodium silicate I Fe+2-Fe+3-Pt solutions were done. It is observed,by means of potencial variations a high affinity of borax and sodium silicate with Fe+2 and a poor affinity with Fe+3.

Estudos potenciométricos de soluções aquosas de Ferro (II) e Ferro (III) em presença de bórax e silicato de sódio