Inorganic speciation of As(III, V), Se(IV, VI) and Sb(III, V) in natural water with GF-AAS using solid phase extraction technology

• Published in: Talanta (Oxford) Vol. 72; no. 2; pp. 723 - 729
• Main Authors: Zhang, Liang, Morita, Yukitoki, Sakuragawa, Akio, Isozaki, Akinori
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 30.04.2007; Oxford Elsevier
• Subjects: Analytical chemistry; Antimony; Arsenic; Chemistry; Exact sciences and technology; Freshwater; GF-AAS; Multi-element determination; Selenium; Speciation analysis; Spectrometric and optical methods; Antimony; Multi-element determination; GF-AAS; Speciation analysis; Selenium; Arsenic; Solid phase extraction; Selenium VI; Vanadium III; Inorganic element; Chemical enrichment; Arsenic V; Precipitation; Palladium III; Titanium; Selenium IV; Coprecipitation; Speciation; Seawater; Trace analysis; Pyrolysis; Antimony III; Filtration; Organic dithiocarbamate; Stirring; Nitric acid; Antimony V; Chemical modification; Vanadium IV; Multicomponent analysis; Arsenic III; Thermoelectric atomization; Solid phase; River water; Slurries; Atomic absorption spectrometry
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2006.12.001

The paper presents a procedure for the multi-element inorganic speciation of As(III, V), Se(IV, VI) and Sb(III, V) in natural water with GF-AAS using solid phase extraction technology. Total As(III, V), Se(IV, VI) and Sb(III, V) were determined according to the following procedure: titanium dioxide (TiO 2) was used to adsorb inorganic species of As, Se and Sb in sample solution; after filtration, the solid phase was prepared to be slurry for determination. For As(III), Se(IV) and Sb(III), their inorganic species were coprecipitated with Pb-PDC, dissolved in dilute nitric acid, and then determined. The concentrations of As(V), Se(VI) and Sb(V) can be calculated by the difference of the concentrations obtained by the above determinations. For the determination of As(III), Se(IV) and Sb(III), palladium was chosen as a modifier and pyrolysis temperature was 800 °C. Optimum conditions for the coprecipitation were listed for 100 ml of sample solution: pH 3.0, 15 min of stirring time, 40.0 μg l −1 Pb(NO 3) 2 and 150.0 μg l −1 APDC. The proposed method was applied to the determination of trace amounts of As(III, V), Se(IV, VI) and Sb(III, V) in river water and seawater.