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The adsorption of methylene blue (MB) on three soil amendments, red mud from Hungary, red mudrrrrrrrrrnfrom UK and beringite from Belgium, was studied to determine the surface areas of the amendments usingrrrrrrrrrna 0.005 mol L-1 NaCl solution and deionised water as background solutions. The surface areas determinedrrrrrrrrrnby the methylene blue method in the 0.005 mol L-1 NaCl solution were 3.357, 2.340 and 5.576 m2 g-1 forrrrrrrrrrnred mud (Hungary), red mud (UK) and beringite, respectively slightly lower than those in the deionisedrrrrrrrrrnwater system. The largest surface area of beringite suggested that the MB could adsorb effectively on therrrrrrrrrninterlayer surface of illite. The effect of NaCl on the surface areas was relatively small and may therefore berrrrrrrrrnignored. Both the 0.005 mol L-1 NaCl solution and deionised water could be used as a background solutionrrrrrrrrrnfor measurement of surface area of oxide-rich materials.
The adsorption of methylene blue (MB) on three soil amendments, red mud from Hungary, red mud r r r r r r r nfrom UK and beringite from Belgium, was studied to determine the surface areas of the amendments using r r r r r r r r na 0.005 mol L-1 NaCl solution and deionized water as background solutions. r r r r r r r nby the methylene blue method in the 0.005 mol L-1 NaCl solution were 3.357, 2.340 and 5.576 m2 g-1 for r r r r r r r r r nred mud (Hungary), red mud (UK) and beringite, respectively slightly lower than those in the deionised r r r r r r r r n nwater system. The largest surface area of beringite suggested that the MB could adsorb effectively on the r r r r r r r r ninterlayer surface of illite. The effect of NaCl on the surface areas was Both the 0.005 mol L-1 NaCl solution and deionized water could be used as a background solution r r r r r r r r r nfor measurement of surface area of oxide-rich materials.