Reference number
ISO 8176:1986
ISO 8176:1986
© ISO 2024
ISO 8176:1986
Butadiene for industrial use — Determination of active tert-butyl-catechol (TBC) (4- (1,1- dimethylethyl)-1,2-benzenediol) — High performance liquid chromatographic method
Edition 1
1986-07
1986-07
Withdrawn
Abstract
The active TBC in a test portion is extracted by mixing with a solution containing m-nitrophpenol (as the internal standard) and evaporating the butadiene. The TBC and m-nitrophenol are separated by high-performance liquid chromatography and detected by UV: The peak areas or peak heights are measured and the TBC content is determined by using a calibration graph. The polymerization inhibitor TBC can also be determined by a spectrometric method (ISO 6684) but that method is not able to differentiate between the active inhibitor and its oxidized, inactive form. The present method specifically measures the concentration of the active form of TBC. The method is applicable to butadiene having TBC contents in the range 0 to 250 mg/kg.