Spectrographic Analysis Of Films Of Silicophosphate Glass. (In Russian)

Surface P2O5 is extracted by immersing the glass sample in H2O at 90; the extract is the evaporated in the presence of carbon powder. The content of P in the whole glass is obtained by dissolving a sample in a mixture of 15ml of 48% HF, 10ml of 70% HNO3 and 300ml of H2o, followed by evaporation of the soln. in the presence of carbon powder. In each instance the P is determined by spectrographic measurement of the line P I2553.3 A.