Spectrofluorimetric determination of traces of zinc with the cadmium—α,β,γ,δ-tetrakis(4-sulphophenyl) - porphine complex

✍ Scribed by Shukuro Igarashi; Takao Yotsuyanagi

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 455 KB
• Volume: 281
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(93)85192-m

✦ Synopsis

Ahstract A highly sensitive spectrofluorimetric method for the determination of zinc was established by using the metal ion substitution reaction of the cadmium-@,~,&tetrakis(4-sulphophenyl)porphine (H,P4-) complex with zinc ion. The zinc complex, ZnP4-, was quantitatively formed within 3 min at room temperature in the pH range 10-11. The relative fluorescence intensity ratio, F(ZnP4-)/F(CdP4-), was 37.0 at h(em) = 604 nm [A(ex) = 422 nm]. The calibration graph was linear over the concentration range 5-100 ng Zn*+ ml-' in sample solution. The detection limit (signal-to-noise ratio = 3) was 0.15 ng Zn*+ ml-' and the relative standard deviation was 1.39% for 16.6 ng Zn*+ ml-' (ten determinations). Results are given for the application of the method to the determination of Zn*+ in tap water.