Uptake and Speciation of Inorganic Arsenic with Cellulose Fibre Coated with Yttrium Hydroxide Layer as a Novel Green Sorbent
A novel adsorbent was developed by coating yttrium hydroxide precipitate layer on cellulose fibre. This material takes up ca. 98% of 5 μg·L 1 As(Ⅲ) and As(V) at low pH (pH〈7), while a favorable selectivity for As(V) was achieved within pH 11--12. In practice, a mini-column packed with Y(OH)3 precipi...
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Veröffentlicht in: | Chinese journal of chemistry 2012-09, Vol.30 (9), p.2225-2231 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A novel adsorbent was developed by coating yttrium hydroxide precipitate layer on cellulose fibre. This material takes up ca. 98% of 5 μg·L 1 As(Ⅲ) and As(V) at low pH (pH〈7), while a favorable selectivity for As(V) was achieved within pH 11--12. In practice, a mini-column packed with Y(OH)3 precipitate layer coated cellulose fibre particles was incorporated into a sequential injection system for selective uptake of arsenate at pH 11.5. The retained arsenate was afterwards recovered with 50μL of 0.8 mol.L l NaOH solution as eluent, followed by hydride generation in a reaction medium of 2.0 mol·L-1 HCl and 1.0% NaBH4 solution (W/V, in 0.5% NaOH) after pre-reduction of arsenate to arsenite by KI-ascorbic acid (5%, W/V), with detection by atomic fluorescence spec- trometry. Total inorganic arsenic was quantitatively taken up at pH 6.0 by following the same procedure and arsenic speciation was performed by difference. With a sample volume of 1.0 mL, an enrichment factor of 16.4 was derived with a detection limit of 17 ng.L-1 within a linear range of 0.05--2.0μg.L ]. A relative standard deviation (RSD) of 2.6% (0.5 μg·L-1, n= 11) was achieved. The procedure was validated by analyzing arsenic in a certified refer- ence material GBW 09101 (human hair), and speciation process requires no organic solvents, thus Y(OH)3 coated of inorganic arsenic in natural water samples. The entire cellulose fibre provides a green adsorbent. |
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ISSN: | 1001-604X 1614-7065 |
DOI: | 10.1002/cjoc.201200580 |