Determination of Several Valences of Iron, Arsenic and Antimony, and Selenium in Glass

Methods for the analysis of silicate glasses are described for ferrous iron, for tri‐ and pentavalent arsenic and antimony when present together, and for selenium as Se 2‐ , Se°, Se 4+ , and Se 6+ . Analytical results are presented for FeO in the range 0 to 0.25%; for total As and Sb as tri‐oxide, 0.1 to 1.25%; and for total Se, 0.05 to 0.25%. Apparatus for the determination of FeO is described, and a comparison is made of analytical data for FeO versus light transmittance at 1000 and at 1050 mμ for the same glass.