Polarographic and voltammetric study of the Sc(III)-acid chrome blue K complex and determination of trace scandium

Journal Article · Fri Oct 01 04:00:00 EDT 1993 · Analytical Letters; (United States)

DOI:https://doi.org/10.1080/00032719308017463· OSTI ID:7072307

Wang, Chunming ^[1]; Fu, Xiaotai ^[2]

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1. Lanzhou Univ. (China)
2. Daqing Petroleum Institute, Anda City (China)

A new system using a polarographic adsorptive wave for determining trace scandium was proposed. In 0.2 mol/L NH[sub 4]OAc, the Sc(III)-ACBK [1,8-dihydroxy-2-(2-hydroxy-5-sulfo-1-phenylazo)-3,6-disulfo-naphthalene, called acid chrome blue K] complex emerged a sensitive adsorptive complex wave (Ep[prime] = [minus]0.67V). The molar ratio of Sc(III) to ACBK in the complex was established as 1:2 and the apparent stability constant [beta][sub 2] = 2.7 [times] 10[sup 15]. But for Y(III), the molar ratio was 1:1 and [beta]=1.5 [times] 10[sup 5]. Because of the particularity of Sc complex, the sensitivity and the selectivity of determination Sc is much better than that of other rare earth ions. The detection limits is 1.1 [times] 10[sup [minus]7] mol/L for oscillopolarography and 2.0 [times] 10[sup [minus]8] mol/L for adsorptive stripping voltammetry.

• OSTI ID: 7072307
• Journal Information: Analytical Letters; (United States), Journal Name: Analytical Letters; (United States) Vol. 26:10; ISSN ANALBP; ISSN 0003-2719
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
400400 -- Electrochemistry
CHEMICAL ANALYSIS
COMPLEXES
ELEMENTS
METALS
POLAROGRAPHY
QUANTITATIVE CHEMICAL ANALYSIS
SCANDIUM
SCANDIUM COMPLEXES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENTS
VOLTAMETRY