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Uptake and Speciation of Inorganic Arsenic with Cellulose Fibre Coated with Yttrium Hydroxide Layer as a Novel Green Sorbent
Author(s) -
An MyongIl,
Zhang Xiaoxing,
Yang Ting,
Chen Mingli,
Wang Jianhua
Publication year - 2012
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201200580
Subject(s) - chemistry , arsenate , arsenite , arsenic , hydroxide , ascorbic acid , sorbent , detection limit , nuclear chemistry , cellulose , inorganic chemistry , yttrium , adsorption , certified reference materials , chromatography , oxide , organic chemistry , food science
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 50 µL of 0.8 mol·L −1 NaOH solution as eluent, followed by hydride generation in a reaction medium of 2.0 mol·L −1 HCl and 1.0% NaBH 4 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 spectrometry. 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 0.05–2.0 µg·L −1 . 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 reference material GBW 09101 (human hair), and speciation of inorganic arsenic in natural water samples. The entire process requires no organic solvents, thus Y(OH) 3 coated cellulose fibre provides a green adsorbent.