Determination of TiO₂ in Sefstromite by Inductively Coupled Plasma Atomic Emission Spectrometry

The traditional spectrophotometric and titration methods for the determination of TiO₂ in sefstromite are of overelaborate operation, long period, and low analysis efficiency and are not suitable for large batches of samples. In this paper, a direct analytical method for the determination of TiO₂ in sefstromite by inductively coupled plasma atomic emission spectrometry (ICP-AES) is proposed. The sample was digested by mixed acid and 1 mL of 1+1 H₂SO₄, and then it was extracted by 10% HCl. The test results showed that the measured value of the National Standard Reference Materials was consistent with the certified value at the wavelength of 336.1 nm. The detection limit for TiO₂ was 30 μg/g and the precision (RSD,n=12)was less than 0.8% at the wavelength of 336.1 nm. The method is simple and accurate, and is suitable for batch samples.