552.    [CHEVALIER, R., AND MATHIEU, S.]  [Adsorption in Precipitation of the Hydroxide from Ferric Sulfate.]  Compt. Rend., vol. 206, 1938, pp. 1249-1251, 1469-1471, 1955-1958; and vol. 207, 1938, pp. 58-61; Chem. Abs., vol. 32, 1938, pp. 4854,5269, 6516.

                  In precipitating ferric oxide from a solution of ferric sulfate with KOH, the magnetic susceptibility of the precipitant is a strong function of the concentration and excess of base employed.  The higher the concentration and excess of base, the higher the magnetic susceptibility of the precipitant.  Studies conducted at the Bureau of Mines have shown that precipitated oxides prepared from ferric nitrate behave very similarly to the oxides studied above.