Abstract
In this study, amounts of titanium contained in sea water, biomaterials and sediments were determined by a method using tiron (disodium-1, 2-dihydroxybenzene-3, 5-disulfonate).
Ferric iron was added to slightly acidified sample solution as a carrier for titanium, and pH was adjusted to 8.5-9.5 with ammonia. Ferric hydroxide was filtered and dissolved in sulfuric acid. The major portion of iron was removed by mercury cathode electrolysis, and then the absorbance of titanium-tiron complex formed at pH 4 in the presence of EDTA, was measured at 420 mμ.
After analyzing sea water and lake water samples, several kinds of biomaterials such as seaweed or shellfish, and sediments, the following results were obtained: The content of titanium in sea water amounted to approximately 2μg/l, and that in several kinds of shellfishes and seaweeds amounted to 2.5-6.9×10-2% and 2.5-6.5×10-8% in ash samples, respectively. The titanium content in marine sediments was of the order of 10-1%. In general, the sea samples contained less amount of titanium as compared with the similar land samples.
