Highly sensitive successive determinations for Pt II and Se IV ions have been developed based upon reactions with 1,4-dibromo-2,3-diaminonaphthalene (Br 2 DAN), which forms a near-infrared (NIR) absorbing complex (ε = 1.2 × 10 5 1 mol -1 cm -1 at 800 nm) and an emissive complex (ex. 386 nm, em. 604 nm) for Pt II and Se IV ions, respectively, in acidic aqueous micellar solutions. In the presence of a cationic surfactant, cetyltrimethylammonium chloride, the detection limits for Pt II and Se IV ions are 1.2 ng ml -1 (3σ) and 0.98 ng ml -1 (S/N = 3), respectively. Hydrobromic acid plays a key role to enhance the color development of the NIR-absorbing Pt II complex. The influences of Cu II and Zn II ions at the normal human serum levels are readily tolerated, and interference from Fe I3II ion at 35 μmol 1 -1 is circumvented by the addition of 50 μmol 1 -1 of polyaminocarboxylates, such as EDTA.
ASJC Scopus subject areas
- Analytical Chemistry