TY JOUR TI Spectrophotometric method for the determination of different-forms of iron in silicate glasses KW industrial silicate glasses KW optical spectrophotometry KW different-shaped iron KW calibration curves KW phenanthroline method JO Technique and technology of silicates AU Nartsev, V.M. AU Mulevanov, S.V. PY 2014 IS 21 PB Individual Entrepreneur Svetlana Vasilievna Samchenko