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Research Article
Guy B. P. Ngassa
University of Douala: Universite de Douala
Corresponding Author
Ignas Tonle Kenfack
University of Dschang Faculty of Sciences: Universite de Dschang Faculte des Sciences
Corresponding Author
ORCiD: https://orcid.org/0000-0001-9794-788X
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A composite material prepared by polymerization of β-cyclodextrin (β-CD) on the surface of natural hydroxyapatite using citric acid as cross linker, was employed as electrode material for the detection of Pb(II). Hydroxyapatite was obtained from bovine bones, following a three-step procedure including pre-calcination, chemical treatment with (NH4)2HPO4 and calcination. The structure of the pristine hydroxyapatite (NHAPP0.5) and its functionalized counterpart (NHAPp0.5-CA-β-CD) materials was examined using XRD and FTIR. Upon deposition as thin film on a glassy carbon electrode (GCE), the ion exchange ability of NHAPp0.5-CA-β-CD was exploited to elaborate a sensitive sensor for the detection of lead. The electroanalytical procedure was based on the chemical accumulation of lead ions under open-circuit conditions, followed by the detection of the preconcentrated species using differential pulse anodic stripping voltammetry. The reproducibility of the proposed method based on different measurements in a solution containing 2 µM lead gave a coefficient of variation of 1.27%. Significant parameters that can affect the lead stripping response were optimized: a linear calibration curve for lead (II) in the concentration range of 2 × 10− 8 mol L− 1 − 20 × 10− 8 mol L− 1 (R2 = 0.998) was obtained. The detection limit (DL = 3S/M) and the sensitivity of the proposed sensor were 5.06 × 10− 10 mol L− 1 and 100.80 µA.µM− 1, respectively. The interfering effect of several ions expected to affect the stripping determination of lead was evaluated, and the proposed sensor was also successfully applied in the determination of Pb2+ ions in spring water and well water.
Keywords
Hydroxyapatite, β-cyclodextrin, Lead, Electroanalysis
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CURRENT STATUS: Under Review
Version 1
Posted 11 May, 2021
No community comments so far
Editorial decision: Major Revision
On 12 Jun, 2021
Reviews received
Received 22 May, 2021
Reviewers invited
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Editor invited
On 07 May, 2021
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On 25 Apr, 2021
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This preprint is under consideration at Environmental Science and Pollution Research. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research Article
Guy B. P. Ngassa
University of Douala: Universite de Douala
Corresponding Author
Ignas Tonle Kenfack
University of Dschang Faculty of Sciences: Universite de Dschang Faculte des Sciences
Corresponding Author
ORCiD: https://orcid.org/0000-0001-9794-788X
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Review
Version 1
Posted 11 May, 2021
No community comments so far
Editorial decision: Major Revision
On 12 Jun, 2021
Reviews received
Received 22 May, 2021
Reviewers invited
Invitations sent on 08 May, 2021
Editor invited
On 07 May, 2021
Editor assigned
On 25 Apr, 2021
First submitted
On 12 Apr, 2021
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
A composite material prepared by polymerization of β-cyclodextrin (β-CD) on the surface of natural hydroxyapatite using citric acid as cross linker, was employed as electrode material for the detection of Pb(II). Hydroxyapatite was obtained from bovine bones, following a three-step procedure including pre-calcination, chemical treatment with (NH4)2HPO4 and calcination. The structure of the pristine hydroxyapatite (NHAPP0.5) and its functionalized counterpart (NHAPp0.5-CA-β-CD) materials was examined using XRD and FTIR. Upon deposition as thin film on a glassy carbon electrode (GCE), the ion exchange ability of NHAPp0.5-CA-β-CD was exploited to elaborate a sensitive sensor for the detection of lead. The electroanalytical procedure was based on the chemical accumulation of lead ions under open-circuit conditions, followed by the detection of the preconcentrated species using differential pulse anodic stripping voltammetry. The reproducibility of the proposed method based on different measurements in a solution containing 2 µM lead gave a coefficient of variation of 1.27%. Significant parameters that can affect the lead stripping response were optimized: a linear calibration curve for lead (II) in the concentration range of 2 × 10− 8 mol L− 1 − 20 × 10− 8 mol L− 1 (R2 = 0.998) was obtained. The detection limit (DL = 3S/M) and the sensitivity of the proposed sensor were 5.06 × 10− 10 mol L− 1 and 100.80 µA.µM− 1, respectively. The interfering effect of several ions expected to affect the stripping determination of lead was evaluated, and the proposed sensor was also successfully applied in the determination of Pb2+ ions in spring water and well water.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
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