Determination of titanium in titanium dioxide pigments, paints and other materials by chromium(II) chloride reduction and automatic potentiometric titration

Rapid determination of Ti in TiO2 by ICP OES

“…These may arise for several reasons; impurities in the sample may undergo simultaneous reduction along with Ti 4+ in the presence of aluminium in the acidic medium, the reduction and titration must be conducted under an atmosphere of carbon dioxide, and the identication of the end-point of the titration is somewhat subjective and may lead to bias amongst operators. 2,14 The results from ICP OES were concordant with values generated by both reference methods, i.e., spectrophotometric and titrimetric, as evidenced by the application of a paired t-test (95% condence level) comparing the results summarized in Table 2. 21…”

“…2,8,11,12 This methodology is based on an oxidation-reduction reaction in which metallic aluminium is used to reduce titanium, allowing its determination by titration against a solution of ammonium iron(III) sulfate, in which Fe 3+ ions react with the analyte. 2,8,11,12 Some sample treatment studies for the determination of Ti in TiO 2 pigments, paints, ilmenites and other materials involve treatment of the samples with potassium bisulfate or potassium hydrogen sulphate followed by fusion, 13,14 microwave assisted digestion or hot acid digestion. 13,15 Murthy et al 13 employed ICP OES for the determination of Ti in ilmenites having 55-56% m m À1 TiO 2 content.…”

“…Norris 14 described a method for the determination of Ti in TiO 2 pigments and other materials wherein the sample was initially fused with potassium hydrogen sulphate, dissolved in 5% v/v H 2 SO 4 , and treated with a solution of CrCl 2 , followed by automatic potentiometric titration with 0.0625 mol L À1 FeNH 4 (SO 4 ) 2 $12H 2 O. 14 Bentlin et al 15 determined Ti in paints (16% m m À1 Ti) following their decomposition by ashing with HNO 3 and HF in an open vessel. 15 Other studies report dissolution methods of TiO 2 employing inorganic salts and/or organic reagents, but they are either too slow or non-quantitative.…”

Pickering Emulsions of Fluorinated TiO2: A New Route for Intensification of Photocatalytic Degradation of Nitrobenzene

“…The amount of fluorine in samples was determined by means of ion chromatography after digestion dissolution of the TiO 2 material by fusion with potassium hydrogen sulfate and extraction of the melt with dilute sulfuric acid. 52 Collected samples were then analyzed for F − anions using ion chromatography (930 Compact IC Flex, Metrohm, Switzerland) equipped with a chemical suppressor and conductivity detection. Elution solvent was 8 mmol•L −1 sodium carbonate (Fisher Scientific, Illkirch, France) in ultrapure water.…”

Organic elemental analysis

“…Siripone et al ( 82) described neutron activation analysis of biological materials using mineralization with a saturated Mg(N03)2 solution. Norris (83) determined Ti in paints by fusion of the sample with KHS04 and dissolution of the melt in H2S04. Cantillo et al (84) fused estuarine sediments with LiB02 and dissolved the bead in HN03 to obtain the solution for dc plasma emission spectrometry.…”