Photometric Determination of Chloride in Metallic Titanium

Many reports have been published on the quantitative determination of chloride in metallic titanium but no report has been found on a quantitative determination of a minute amount of chloride in titanium metal samples suitable for rapid analysis. The authors applied a photometric method of using ferric alum and mercuric thiocyanate reagents for the determination of chloride in titanium metal and the decomposition of the sample is effected by use of a fusion method with sodium or potassium hydroxide, or a solution method with the use of hydrogen fluoride. The results of quantitative determination of samples containing above 0.01 % chloride by fusion method with the use of sodium hydroxide or solution method with the use of hydrogen fluoride were satisfactory and the time required for the analysis was 6080 minutes. In general, the fusion method with the use of potassium hydroxide gave lower value with larger errors and it was somewhat less accurate than those of the fusion method with the use of sodium hydroxide or the solution method with hydrogen fluoride.