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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/1033

Title: Preconcentration of lead with amberlite XAD-2 and amberlite XAD-7 based chelating resins for its determination by flame atomic absorption spectrometry
Authors: Tewari, P K
Singh, Ajai K
Keywords: Amberlite XAD-2
Amberlite XAD-7
Lead
Atomic absorption spectrometry
Chelating resins
Preconcentration
Chromotropic acid
Pyrocatechol
Thiosalicylic acid
Xylenol orange
Issue Date: 2002
Citation: Talanta, 56(4), 735-744
Abstract: Four chelating matrices prepared by coupling Amberlite XAD-2 with chromotropic acid (AXAD-2-CA or 1), pyrocatechol (AXAD-2-PC or 2) and thiosalicylic acid (AXAD-2-TSA or 3) through azo spacer and impregnation of Amberlite XAD-7 with xylenol orange (AXAD-7-XO or 4) have been studied for enrichment of lead(II). All the four resins quantitatively sorb Pb(II) at pH 3.0–8.0 when the flow rate is maintained between 2 and 10 ml min−1. HNO3 (0.5–4.0 M) instantaneously elutes Pb(II) from all the four chelating resins. The sorption capacity is in the range 16.0–186.0 μmol g−1 and loading half time (t1/2) between 3.2 and 15.5 min. The tolerance limits of electrolytes (NaCl, NaBr, NaNO3, Na2SO4, Na3PO4) and cations (Ca and Mg) are reported. Phosphate interferes in the sorption with 3 and 4. The limit of detection and limit of quantification have been found to be in the ranges 2.44–7.87 and 2.76–8.64 ng ml−1, respectively. Lead has been determined in river (RSD 2.6–12.8%) and tap (RSD 1.8–7.2%) water samples.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/1033
Appears in Collections:Chemistry

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