Atomic-absorption spectrophotometric determination of tin by hydride generation in non-aqueous medium after extraction.
Tin at the microgram level was extracted into chloroform with N-nitrosophenylhydroxamic acid (ammonium salt) from 0.5-1.5M hydrochloric acid medium. Tin hydride was generated from 1 ml of the chloroform extract mixed with 3 ml of 1% sulphuric acid solution in N,N-dimethylformamide. by injection of 3 ml of 2% sodium tetrahydroborate solution in N,N-dimethylformamide through the septum of the hydride generator. Tin was then determined by AAS at 224.6 nm with an acetylene-air flame, and nitrogen as carrier gas. The peak-height of the signal was linearly related to amount of tin up to 20 mug. The sensitivity of the determination was improved by the extraction. The method was applied to determination of tin in tinned foods and aluminium-base alloys with good accuracy and precision.
Aznarez
J
J
Department of Analytical Chemistry, Faculty of Sciences, University of Zaragoza, Zaragoza, Spain.
Rabadan
J M
JM
Ferrer
A
A
Cipres
P
P