Determination of Rare Earth、Chromium、Manganese、Silicon in the New Rare Earth Chromium Manganese Silicon Inoculation

Firstly the optimum conditions of experiment were selected.A new determination was established.It was a joint determination,rare earth in the new inoculation was determined by Spectrophotometry,and chromium,manganese,silicon in the new inoculation were determined by volumetric determination.A blue purple colored coordination complex of rare earth and chlorophosphonazo Ⅲ was formed under the certain acidity.Absorption maximum of the complex was found at the wavelength of 660nm,Lambert-Beer's law was kept in the range within 20 g of rare earth per 50mL of solution.Linear correlation coefficient r=0.999 6.Chromium and Manganese in the solution were titrated with standard of Fe(NH4)2(SO4)2,the indicator was N-phenylanthranilic acid.This determination is easy to operate,higher accuracy,it can meet the needs of the ordinary test.The results of the determinations were obtained by standard addition method,giving the values of recovery were more than 98%.