Wolfgang Beltracchi is an infamous art counterfeiter, having successfully forged

Question

Wolfgang Beltracchi is an infamous art counterfeiter, having successfully forged at least 14 paintings sold for millions of dollars, before his selection of paint exposed him as a fraud. In his forgery of a painting supposedly made in 1914, Beltracchi used a white paint not available until years later. Beltracchi should have used basic lead(II) carbonate or zinc(II) oxide, which were popular historical pigments for white paint. Instead, he used the modern white pigment of titanium(IV) oxide. The ability to test for the titanium ion in white paint has exposed other forgeries by Beltracchi as well as other artists. Interestingly, the scandal has now made Beltracchi’s own original work extremely valuable, sometimes surpassing the value of the forgeries.

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A good qualitative test for titanium(IV) oxide is that when the compound reacts with hydrogen peroxide and sulfuric acid, the solution turns orange-red. What information would you need to know to use this test to determine how much titanium (IV) oxide is in a paint with this pigment? HTML Editor x2 x. TT Font Sizes Paragraph 2 pts Question 6 A good qualitative test for titanium (IV) oxide is that when the compound reacts with hydrogen peroxide and sulfuric acid, the solution turns orange-red. What instrument would you need to use this test to determine how much titanium (IV) oxide is in a paint with this pigment?

Explanation / Answer

Answer 6) Quantitative analysis of Ti(IV)

A) Chemical Method : Inorganic Qulaitative method

1) Titanium (Ti) is analyzed through Redox titration. It involves reduction of T(IV) to Ti(III) and reoxidation to Ti(IV) using.

2) Ti(IV) is dissolved in hot Sulphuric acid. Dissolved Ti(IV) is reduced to Ti (III) by adding metalic aluminium (Al).

3) Reduced Ti is the re oxidized back to Ti(IV) by standard oxidizing agent like H2O2.

B) Instrumental i.e. Physical method to analyze Ti(IV) is the use of Atomic spectroscopy. More elaborately,

1) Inclusive Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES) or

2) Inductively Coupled Plasma - Mass spectrometry (ICP-MS).

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