GRAVIMETRIC DETERMINATION OF COPPER(II) USING N1-HYDROXY-N1-(m-TOLYL)-N2-(o-CHLOROPHENYL)-P-TOLUAMIDINE HYDROCHLORIDE.

Article abstract of DOI:10.1246/bcsj.56.1624

A simple, rapid, and accurate method has been developed for the gravimetric determination of Copper(II) using a new reagent N**1-hydroxy-N**1-(m-tolyl)-N**2-(o-chlorophenyl)-p-toluamidine hydrochloride (HTCPTH). The proposed reagent reacts quantitatively with copper at 3. 3-11. 0 pH giving a buff colored precipitate. The precipitated complex can be easily filtered, dried and directly weighed as (C//2//1H//1//8N//2OCl)//2Cu. The complex is thermally stable as is evident from DTA and TGA studies up to 210 degree C and insoluble in many organic solvents. Most of the common ions including Ni(II), Co(II), Cr(III), Mn(II), etc. do not interfere. The interference due to iron(III) can be eliminated by masking it with tartaric acid. The method has been successfully applied for the determination of copper in some British Chemical Standards alloys.