Detection and quantification of montmorillonite nanoclay in water-ethanol solutions by graphite furnace atomic absorption spectrometry.
Organo-modified montmorillonite (O-MMT) was detected in various water-ethanol solutions by using graphite furnace atomic absorption spectrometry, based on the simultaneous elemental analysis of silicon (Si) and aluminium (Al). The quantification limits of the method were 0.03 mg L⁻¹ for Si and 0.01 mg L⁻¹ for Al, but can be improved to 8 μg L⁻¹ for Si and 3 μg L⁻¹ by using the concentration function of the instrument. A stability test of O-MMT in suspension was conducted by considering the solvent type (i.e., water and/or ethanol) and a surfactant. A good dispersion of O-MMT was achieved in suspensions with water and ethanol at 1:2 (v/v) or with pure ethanol, while the addition of a surfactant improved the dispersion of O-MMT in water. The Si and Al concentrations in the suspensions were correlated with O-MMT concentrations. The Si and Al contents in the O-MMT were determined by using graphite furnace atomic absorption spectrometry to be 22% ± 1.1% and 9.3% ± 0.5% wt/wt, respectively, which was in agreement with values obtained by X-ray fluorescence spectrometry method performed in this study.
a School of Packaging , Michigan State University , East Lansing , MI , USA.
Xia
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Yining
Maria
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Rubino
Rafael
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Auras
D000535:Aluminum / Q000032:analysis / Q000737:chemistry / Q000633:toxicity; D000538:Aluminum Silicates / Q000032:analysis* / Q000737:chemistry / Q000633:toxicity; D001546:Bentonite / Q000032:analysis* / Q000737:chemistry / Q000633:toxicity; D055598:Chemical Phenomena; D000077215:Clay; D003257:Consumer Product Safety; D000431:Ethanol / Q000737:chemistry; D018857:Food Packaging; D053761:Nanocomposites / Q000032:analysis* / Q000737:chemistry / Q000633:toxicity; D010316:Particle Size; D012825:Silicon / Q000032:analysis / Q000737:chemistry / Q000633:toxicity; D012997:Solvents / Q000737:chemistry*; D013010:Sonication; D013054:Spectrophotometry, Atomic; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry; D013535:Suspensions; D013997:Time Factors; D014481:United States; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry / Q000633:toxicity
D000538:Aluminum Silicates; D012997:Solvents; D013501:Surface-Active Agents; D013535:Suspensions; D014874:Water Pollutants, Chemical; D014867:Water; D001546:Bentonite; D000431:Ethanol; D000535:Aluminum; D000077215:Clay; D012825:Silicon