Molybdenum and antimony by colorimetry after partial digestion by K2S2O7 fusion (Mo) or NaHSO4 fusion-HCl digestion (Sb, rhodamine B).
Ward, Frederick N., Lakin, Hubert. W., Canney, Frank. C., et al
Analytical methods used in geochemical exploration by the U.S. Geological Survey : a compilation of trace and semimicroanalytical methods of yielding semiquantitative data on geologic materials useful in geochemical prospecting for ore deposits