Best available techniques. Production of ammonia, mineral fertilizers and inorganic acids. Selection of marker indicators for air emissions from industrial sources
Yttrium, lanthanum, ytterbium, lutetium and their oxides. Chemical-spectral method of determination of impurities of vanadium, tungsten, iron, cobalt, manganese, copper, molybdenum, nickel, niobium, lead, tantalum, titanium and chromium
