Reactions of 2',7'-bis(acetoxymercuri)- fluorescein with certain complexing anions.

Absorption and fluorescence emission spectra of 2',7'-bis (acetoxymercuri)-fluorescein (AMF) at various pH values and in the presence of mercury-complexing agents such as mercaptoacetic acid, cyanide and iodide have been employed in the study of the reactions of AMF with these ligands. The findings have been applied to the development of methods for the determination of submicrogram quantities of iodide and cyanide with a precision of better than 10%.

Determination of 2,3-dimercaptopropanol-l (BAL) by titration with zinc, with eriochrome black T as indicator.

A method is proposed for the titrimetric determination of BAL with zinc solution and Eriochrome Black T (EBT) as indicator. It is based on the difference of the stabilities of the Zn(BAL)a and Zn-EBT complexes. The accuracy of the method is very good and the interference of diverse mercaptans is limited to those compounds forming zinc complexes more stable than the Zn-EBT complex.