A cellulose-based carboxyl cotton chelator having citric acid as an anchored ligand: preparation and application as solid phase extractant for copper determination by flame atomic absorption spectrometry |
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Authors: | Renmin Gong Yun Hu Jian Chen Fayang Chen Zhili Liu |
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Institution: | (1) College of Life Science, Anhui Normal University, 241000 Wuhu, P.R. China;(2) School of Biotechnology, Southern Yangtze University, 214036 Wuxi, P.R. China;(3) College of Environmental Science, Anhui Normal University, 241000 Wuhu, P.R. China;(4) Department of Biology, Nanjing University, 210093 Nanjing, P.R. China |
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Abstract: | Citric acid was thermochemically esterified onto defatted cotton fibre to produce a carboxyl cotton chelator (CCC), which
had been used for extraction of copper prior to its determination by flame atomic absorption spectrometry. The extraction
of copper has been studied under both batch and column methods. Quantitative extraction of copper was achieved in the pH range
4–7. The time needed to extract each sample was less than 30 min by the batch method. The copper extraction capacity of CCC
was found to be 22.7 mg g−1 at optimal pH value. The elution was quantitative with 1 mol L−1 hydrochloric acid. The feasible flow rate of copper-containing solution for quantitative extraction onto the column packed
with CCC was 0.5–4.0 mL min−1, whereas for elution it was less than 1.5 mL min−1. A 100-fold extraction factor could be achieved under the optimal column conditions. The tolerance limits for common metal
ions on the extraction of copper and the time of column reuse were investigated. The proposed method has been successfully
applied for extraction and determination of copper in industrial wastewater and natural water samples. |
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Keywords: | : Citric acid CCC copper extraction FAAS determination |
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