Spectrophotometric Determination of Traces of Titanium in Silicates

Abstract

An improved method for the spectrophotometric determination of titanium using chromotropic acid is described. The optical density of Ti-chromotropic acid complex at 470 nm has been found to be independent of pH from 3 to 6. Acetic acid sensitises the optical density of the complex. The interfering effect of Fe(III) up to 200 p.gfml has been overcome by adding 5 mg Fe( III) to both the standard and the test solutions followed by reduction with a mixture of ascorbic and acetic acids at pH 3-4. The photosensitivity of chromotropic acid has been eliminated by preparing the reagent solution in 0.3N H 2 S0 4 • The development of Ti-chromotropic acid colour is instantaneous and the optical density does not change for a period of at least 12 hrs. The method has been successfully applied to the determination of traces of Ti0 2 in various ceramic materials such as feldspar, silica bricks, burnt magnesite, chromite and glass.

Novel Utilization of Bauxite‐Treated Fly Ash‐Based Ceramics for its Antibacterial Activity

“…[25][26][27][28] The sample was sieved through 250 holes/cm 2 mesh and the average grain size became 0.5-4 lm and washed several times. Metal oxides of Fe, Ti, Ca, Mg, K, and so on, and some oxides of trace elements like Sr, Ba, Zr, and so on, were also present in this sample.…”

“…Alkalies were determined using flame photometry. [25][26][27][28] The sample was sieved through 250 holes/cm 2 mesh and the average grain size became 0.5-4 lm and washed several times. Then the sample was homogenously mixed with 10, 30, and 50% (w/w) of bauxite by dry milling for 4 h and subsequently wet milling in a high energy planetary ball mill (Fritch P6) at 1200 rpm for 40 min using zirconium balls to prepare the bauxite-based ceramic composites of fly ash.…”