The Calorimetric Determination of Iron in Glass Using Thioglycollic Acid

JSGT 1939 V23 T026-T035

 The calorimetric determination of iron in glass using thioglycollic acid has been further investigated. Tests made to determine the nature and amount of interference likely to be caused by the various elements known to occur in glass show cobalt to be the only one giving rise to serious interference, and where present only in the small amount necessary for decolourising no actual interference is caused. For coloured glasses a preliminary separation of the iron with zinc oxide is recommended.

Analytical details are given for the determination of iron in soda-lime-silica and alkali-lead oxide-silica glasses, and also the modifications necessary when using the method for coloured glasses. The method has been checked against other methods and against a series of standardised samples.

R. C. Chirnside, F.I.C., & Celia F. Pritchard, B.Sc., A.I.C.