Separation of lead from high matrix electroless nickel plating waste solution using an ion-selective immobilized macrocycle system |
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Authors: | Ismail MM Rahman Yoshiaki Furusho Zinnat A Begum Ronald Bruening Hiroshi Hasegawa |
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Institution: | a Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japanb Department of Chemistry, Faculty of Science, University of Chittagong, Chittagong 4331, Bangladeshc GL Sciences Inc., Nishishinjuku 6-22-1, Shinjuku, Tokyo 163-1130, Japand IBC Advanced Technologies Inc., 856 East Utah Valley Drive, American Fork, UT 84003, USAe Division of Nanomaterial Science, EcoTopia Science Institute, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japanf Department of Chemistry, Faculty of Science, Brawijaya University, Jl. Veteran Malang 65145, Indonesia |
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Abstract: | Separation of trace levels of lead from concentrated-matrix electroless nickel plating (ENP) waste solutions is required to meet the increasingly stringent environmental regulations. A solid phase extraction (SPE) system using a molecular recognition technology (MRT) gel was used for the selective separation of trace levels of lead (Pb) from the waste discharge of ENP operations, followed by subsequent analysis with inductively coupled plasma optical emission spectrometry (ICP-OES). Two SPE-MRTs, AnaLig® Pb-01 and AnaLig® Pb-02, packed in 3 mL polypropylene cartridges were used to treat the synthetic metal-waste solutions that were used to simulate the typical metal mixture in ENP bath waste. The fortified solutions contained 100-1000 μg L− 1 of Pb in an HNO3 matrix with pre-added Ni, Cu and other interfering elements (1000 mg L− 1). After the sample treatment, the SPE-MRT cartridges were washed with water and 0.1 M nitric acid, followed by elution with 0.03 M EDTA. The matrix elements (e.g., Ni, Cu) were completely removed at the washing step, while the ‘captured’ Pb was quantitatively eluted, as determined by ICP-OES measurements. The detection limit of the proposed method was 2.6 μg L− 1. ‘Real’ samples from commercial ENP operations were used to assess the validity of this method, and almost quantitative Pb recovery was observed. The excellent Pb selectivity of the SPE-MRT system indicates the potential of the proposed technique for trace-level Pb separation from the Pb-containing high matrix aqueous waste discharge. |
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Keywords: | Solid phase extraction Molecular recognition technology Lead separation Non-destructive Ion-selective Electroless nickel plating solution |
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