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- W2024605721 abstract "Xerogel of SiO2/ZrO2with Zr in amounts of 17.4, 25.4, and 32.8 wt% were prepared by the sol–gel processing method. The oxide particles were homogeneously distributed in the xerogel and the Cr(VI) adsorption capacities were 5.2, 7.0, and 7.8 wt%, following the increasing order of the ZrO2loading. The potentiometric response was better for samples with higher ZrO2loading, and the plot ofEvs -logaCr(VI), whereais the activity, showed a linear correlation with an angular coefficent of 57.2 mV, very close to the 59 mV required for nernstian behavior. For the other two samples with lower metal oxide loadings, the angular coefficients were lower, showing a larger deviation from ideal behavior. The potentiometric selectivity constants,Kpotx,y, wherexis the primary ion (Cr(VI) in the present case) andyis the interferent ion, were calculated. The following values ofKpotx,ywere found for the different interferent ions: Cl−, 0.24; NO−3, 2 × 10−3; HPO2−4, 2 × 10−4; SO2−4, 3 × 10−5; Cr3+, 6 × 10−9." @default.
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- W2024605721 date "1999-01-01" @default.
- W2024605721 modified "2023-10-11" @default.
- W2024605721 title "The Preparation and Application of Silica–Zirconia Xerogel as Potentiometric Sensor for Chromium(VI)" @default.
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- W2024605721 doi "https://doi.org/10.1006/jcis.1998.5887" @default.
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