Determination of Iron and Chromium by Precipitation from Homogeneous Solution Methods

Abstract

Iron and chromium are precipitated quantitatively as their

hydroxides by urea hydrolysis method from homogeneous solution.

The pH for complete prcipitation for iron is 7.4 and for chromium

is 7.2. The method has the advantage that the precipitates can be

weighed as hydroxides after drying at 110ºC. These methods are

advantageous over earlier methods since the precipitate need not to

be ignited. Thermogravimetric and X-ray diffraction studies were

made on the precipitates. These methods can be applied in the

preparation of shift catalysts.