ATOMIZATION EFFICIENCIES IN HALOCARBON-LOADED ACETYLENE AIR FLAMES .2. FORMATION OF DIHALIDES AND COMBINED EFFECTS ON VAPORIZATION AND GAS-PHASE ATOMIZATION PROCESSES

Halocarbon vapours (CCl4 and in some cases CF2Cl2) were introduced int o an acetylene-air flame at increasing rates while nebulizing individu al solutions of alkaline earth elements, iron, manganese, chromium, mo lybdenum, tin and also magnesium in the presence of aluminium matrix. Following the theory developed by Sugden and Bulewicz dealing with the signal depression caused by the presence of halocarbons, the formatio n of dichloride species for the alkaline earth metals and also for iro n, manganese and chromium could be elucidated. From the anomalous shap es of the Sugden-Bulewicz plots, incomplete solute vaporization is inf erred for magnesium in the presence of aluminium. For the latter binar y system, an almost complete evaporation of magnesium could be attaine d at 1.2% volume concentration of CCl4 vapour in the flame.