Abstract:

A novel and green method for separating and enriching trace OTC in waste water by aqueous two-phase gas floatation spectrophotometry has been proposed.The hydrophobic complex composed of Zn(II) and OTC was floated into organic phase under the optimal conditions: pH=9, the floatation equipment was home-made, tetrahydrofuran as organic solvent, sodium chloride as separating phase reagent. The data was obtained by spectrophotometry after floatation, the linear regression equation was A=2.038×105C(mol•L-1)+0.005, linear range was from 1.1×10-7 to 9.7×10-5 mol•L-1, correlation coefficient (r) better than 0.9996, relative recovery was 99.8~100.4% , and the limit of detection was 7.36×10-8mol•L-1. It can be applied to analyse the trace OTC in waste water , the results were better.

Key words: Aqueous two-phase gas floatation, spectrophotometry, waste water, Zine(II)