Abstract
This investigation was undertaken to a find a rapid and accurate chemical method for the analysis of basic slag. In the report (Pi), a simple spectrophotometric methods was des -cribed for determination of the P2O5, Cr2O3 and V which were contained in basic slag.
Determination of P2O5: Dissolve the sample (0. 5g.) with HCl and HClO4, and evaporate to fume. Dilute, and transfer the solution to a 250 ml volumetric flask, filtering off any residue. Dilute to the mark. Pipet an aliquot 25 to 50ml of solution into a 100ml volumetric flask. Add vanadate and molybdate. Dilute to the mark and mix well. After 5mn., measure the absorbance at 430m μ against the water.
Determination of Cr2O3: 2g. of sample mixed with 20g. of Na2O2 is fused, the product is extracted with water. Make up to 100ml with water. Pipet an aliquot 5to 10ml of solution into a 100ml volumetric flask. Dilute to the mark and mix well. Measure the absorbance. at 380m. μ against the water.
Determination of V: pipet an aliquot 10ml of solution from among 100ml of solution of the sample described above. Neutralize any excess base with HClO4. Add (NH4) 2S2O8, PAN, and acetone. Ajust to pH 3. 0 to 3. 5 with HClO4 or ammonium acetate. Transfer the solution to a 50ml volumetric flask and dilute to the mark. After 5mn, measure the absorbance at 560m. μ against the blank.
