Speciation of inorganic selenium in environmental water samples by inductively coupled plasma optical emission spectrometry after preconcentration by using a mesoporous zirconia coating on coal cinder.
A simple, novel, and selective flow-injection solid-phase extraction with inductively coupled plasma optical emission spectrometry method was developed for the speciation of inorganic selenium in environmental water samples. A mesoporous zirconia film was simply introduced to coat coal cinder by means of the sol-gel technique, and the adsorptive performance of the coated material for Se(IV)/Se(VI) was investigated in different media. Both Se(IV) and Se(VI) can be retained quantitatively by the material in HCl/NaOH (pH 1.0-9.0) media, while only Se(IV) was adsorbed quantitatively in sodium acetate buffer (pH 3.5-6.0). Thus, the assay of Se(VI) is based on subtracting Se(IV) from total selenium by controlling different adsorptive media without employing any redox procedure. Under the optimum conditions, the detection limit of Se(IV) is 9.0 ng/L with an enrichment factor of 100, and the relative standard deviation is 3.6% (n = 9, C = 5.0 ng/mL). The developed method was successfully applied to the speciation of inorganic selenium in environmental water samples with satisfactory results. In order to further verify the accuracy of the developed method, it was applied to analysis of total selenium in GSBZ 50031-94 certified reference environmental water, and the determined values coincided with the certified values very well.
Department of Chemistry and Chemical Engineering, Hubei Key Laboratory of Pollutant Analysis and Reuse Technique, Hubei Normal University, Huangshi, P.R. China.
Xiao-Shu
XS
Wei
Yi-Wei
YW
Wu
Li-Juan
LJ
Han
Jing
J
Guo
Hong-Li
HL
Sun
D000327:Adsorption; D002021:Buffers; D003031:Coal; D004784:Environmental Monitoring / Q000379:methods; D005618:Fresh Water / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007287:Inorganic Chemicals / Q000737:chemistry; D057230:Limit of Detection; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D010084:Oxidation-Reduction; D044367:Phase Transition; D015203:Reproducibility of Results; D012643:Selenium / Q000737:chemistry*; D019346:Sodium Acetate / Q000737:chemistry; D052616:Solid Phase Extraction; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D015040:Zirconium / Q000737:chemistry*
D002021:Buffers; D003031:Coal; D007287:Inorganic Chemicals; D014874:Water Pollutants, Chemical; D014867:Water; D019346:Sodium Acetate; D015040:Zirconium; D012643:Selenium
Coal cinder; Mesoporous zirconia film; Selenium speciation; Solid-phase extraction