116
Quadro 2 – Concentrações e pH das soluções individuais do Cr(III) e Cr(VI), em CaCl
2
2 mmol L
-1
, utilizadas no experimento de adsorção
AMOSTRAS SOLUÇÕES 1 2 3 4 5 6 7 8 9 10 11 12
Cr(III) (mg L
-1
) 0,0 2,5 5,0 8,0 13,0 18,0 23,0 28,0 36,0 44,0 51,0 60,0
pH da solução* 5,5 4,4 4,2 4,1 4,0 3,8 3,7 3,6 3,6 3,6 3,5 3,5
Cr(VI) (mg L
-1
) 0,0 1,0 2,0 4,0 6,0 8,0 10,0 12,0 14,0 16,0 18,0 20,0
LVA
TG
pH da solução* 5,5 5,4 5,1 5,0 5,1 5,1 5,2 5,1 5,1 5,1 4,9 4,9
Cr(III) (mg L
-1
) 0,0 2,5 5,0 8,0 13,0 18,0 23,0 28,0 36,0 44,0 51,0 60,0
pH da solução* 5,5 4,4 4,2 4,1 4,0 3,8 3,7 3,6 3,6 3,6 3,5 3,5
Cr(VI) (mg L
-1
) 0,0 1,0 2,0 4,0 6,0 8,0 10,0 12,0 14,0 16,0 18,0 20,0
SOLO
LVA
TM
pH da solução* 5,5 5,4 5,1 5,0 5,1 5,1 5,2 5,1 5,1 5,1 4,9 4,9
Cr(III) (mg L
-1
) 0,0 0,5 1,0 2,0 3,0 4,0 6,0 8,0 10,0 13,0 16,0 19,0
pH da solução* 5,5 5,0 5,0 4,6 4,4 4,3 4,3 4,1 4,0 4,0 3,9 3,8
Cr(VI) (mg L
-1
) 0,0 2,5 5,0 7,5 10,0 15,0 20,0 25,0 30,0 40,0 50,0 60,0
Hematita
pH da solução* 5,5 4,8 5,1 5,0 5,2 4,7 4,9 4,8 4,8 4,7 4,6 4,6
Cr(III) (mg L
-1
) 0,0 0,5 1,0 2,0 3,0 4,0 6,0 8,0 10,0 13,0 16,0 19,0
pH da solução* 5,5 5,0 5,0 4,6 4,4 4,3 4,3 4,1 4,0 4,0 3,9 3,8
Cr(VI) (mg L
-1
) 0,0 2,5 5,0 7,5 10,0 15,0 20,0 25,0 30,0 40,0 50,0 60,0
MINERAIS
SINTÉTICOS
Gibbsita
pH da solução* 5,5 4,8 5,1 5,0 5,2 4,7 4,9 4,8 4,8 4,7 4,6 4,6
*pH : potenciometria.