title: Chelatometric titration of tin in non-ferrous alloys with hedta.
abstract: A new titrimetric method for determination of tin (4%) in aluminium alloys, tin- and lead-base alloys, solders, white bearing alloys, special bronzes and silver brazing alloys is proposed. HEDTA, Semi-Xylenol Orange and bismuth perchlorate are used as titrant, indicator and back-titrant respectively. Measures are taken to overcome the hydrolysis of Sn(IV). Monochloroacetic acid and ethylene glycol are added as auxiliary agents. The standard deviation of this method was found to be 0.2 mg and its coefficient of variation to vary from 0.25 to 2%, according to amount of tin. A novel method of sample decomposition and a modified method for separating Sn(IV) are also suggested.
authors.affiliation: Shanghai Research Institute of Materials, The Ministry of Machine Building Industry, Shanghai, People's Republic of China.
authors.forename: Z
authors.initials: Z
authors.lastname: Nan
authors.forename: Y
authors.initials: Y
authors.lastname: Ren-Qing
authors.forename: Y
authors.initials: Y
authors.lastname: Xu-Zhang
authors.forename: L
authors.initials: L
authors.lastname: Zhi-Ren