ANTIMONY ATOMIC ABSORPTION SPECTROMETRY ATOMIC ABSORPTION SPECTROPHOTOMETRY CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING DETERMINATION OF CONTENT EXTRACTION METHODS EXTRACTION METHODS OF ANALYSIS FLUORSPAR METALLURGY MINERALS MINERALS AND ORES SPECTROMETRIC METHOD SPECTROSCOPY TESTING ATOMIC ABSO CHEMICAL ANALYSIS AND TESTIN EXTRACTION METHODS OF AN METALLURGICAL INDUSTRY