title: Flame Atomic Absorption Spectrometric Determination of Trace Metal Ions in Environmental and Biological Samples After Preconcentration on a Newly Developed Amberlite XAD-16 Chelating Resin Containing p-Aminobenzene Sulfonic Acid.
abstract: Amberlite® XAD-16 was functionalized with p-aminobenzene sulfonic acid via an azo spacer in order to prepare a new chelating resin, which was then characterized by water regain value, hydrogen ion capacity, elemental analyses, and IR spectral and thermal studies. The maximum uptake of Cu(II), Ni(II), Zn(II), Co(II), Cr(III), Fe(III), and Pb(II) ions was observed in the pH range 4.0-6.0 with the corresponding half-loading times of 6.5, 7.0, 8.0, 9.0, 11.0, 8.5, and 16.5 min. The sorption data followed Langmuir isotherms and a pseudo-second-order model. Thermodynamic quantities, ΔH and ΔS, based on the variation of the distribution coefficient with temperature were also evaluated. High preconcentration factors of 60-100 up to a low preconcentration limit of 4.0-6.6 μg/L have been achieved for the metal ions. The validity of the method was checked by analyzing standard reference materials and recoveries of trace metals after spiking. The analytical applications of the method were explored by analyzing natural water, mango pulp, mint leaves, and fish.
authors: Aligarh Muslim University, Department of Chemistry, Aligarh, India 202002.
authors: Aminul
authors: A
authors: Islam
authors: Akil
authors: A
authors: Ahmad
authors: Mohammad Asaduddin
authors: MA
authors: Laskar
mesh_terms: D005504:Food Analysis / Q000379:methods; D006863:Hydrogen-Ion Concentration; D008670:Metals / Q000737:chemistry*; D015394:Molecular Structure; D011108:Polymers / Q000737:chemistry; D013054:Spectrophotometry, Atomic / Q000379:methods*; D013425:Sulfanilic Acids / Q000737:chemistry*; D014131:Trace Elements / Q000737:chemistry*; D014815:Vitamins
chemical_list: D008670:Metals; D011108:Polymers; D013425:Sulfanilic Acids; D014131:Trace Elements; D014815:Vitamins; C074337:Amberlite XAD-16