Abstract
Highly sensitive successive determinations for PtII and SeIV ions have been developed based upon reactions with 1,4-dibromo-2,3-diaminonaphthalene (Br2DAN), which forms a near-infrared (NIR) absorbing complex (ε = 1.2 × 105l mol-1 cm-1 at 800 nm) and an emissive complex (ex. 386 nm, em. 604 nm) for PtII and SeIV ions, respectively, in acidic aqueous micellar solutions. In the presence of a cationic surfactant, cetyltrimethylammonium chloride, the detection limits for PtII and SeIV 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 PtII complex. The influences of CuII and ZnII ions at the normal human serum levels are readily tolerated, and interference from FeIII ion at 35 μmol l–1 is circumvented by the addition of 50 μmol l–1 of polyaminocarboxylates, such as EDTA.
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Warashina, T., Hoshino, H. & Yotsuyanagi, T. Successive Determinations of Platinum(II) and Selenium(IV) with 1,4-Dibromo-2,3-diaminonaphthalene in Aqueous Micellar Solutions. ANAL. SCI. 17, 859–863 (2001). https://doi.org/10.2116/analsci.17.859
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DOI: https://doi.org/10.2116/analsci.17.859