Rapid gravimetric determination of chlorine in metallic titanium

Abstract

Methods of quantitative determination of chlorine in metallic titanium so far adopted were examined and a rapid method was proposed as the results of the examination. Hydrofluoric acid (20 cc per 5 g of sample) is taken as the best reagent to decompose the sample without any loss of chlorine (Table 1 and 2). Nitric acid added to hydrofluoric acid worked as an oxidizing agent to eliminate hydrolysis of titanium (Table 3). Chlorine was centrifuged in the form of silver chloride and turned to separable form (Table 4). Micro-glass filter and a small drying box helped the rapid filtration and drying of silver chloride (Fig. 1 and Table 8). This method showed 100% recovery (Table 5) of total chlorine in metallic titanium being contained in the forms of chloride and chlorate. The precision is assumed 5% and the lower limit of the determination is 0.005% Cl (Table 6). The time required for analysis was 40?70 min. a sample (Table 8).