Solvent extraction of chromium: A review.

The separation of chromium by solvent extraction is reviewed.

Precipitation of beryllium in presence of succinate by the urea hydrolysis technique.

Beryllium can be precipitated as a dense and easily filterable precipitate in presence of succinate by the urea hydrolysis technique. Calcium, magnesium and manganese do not interfere to the extent that they do in the ammonia precipitation. One advantage over the basic sulphate method is that the oxide is obtained at a considerably lower temperature. However, when ammonia salts are present, the basic sulphate method is to be preferred.

Study of beryllium oxinate by the homogeneous precipition method.

Beryllium oxinate has been proeipitated from homogeneous solutions and the nature of the complex has been studied by thermo gravimetric, infrared and X-ray methods. A structural formula has been proposed on the basis of the results.

Precipitation of beryllium from homogeneous solution in presence of sulphate by hydrolysis of urea.

Beryllium can be precipitated from homogeneous solution as a dense and easily filterable precipitate by the hydrolysis of urea, in the presence of sulphate. The method has been applied to the gravimetric determination of beryllium as oxide. The nature of the precipitate thus obtained has been examined by thermogravimetric, infrared, photomicrographic and X-ray methods.