Solid phase extraction and determination of Cr(III) by spectrophotometry using cefaclor as a complexing reagent and FAAS

Abstract

The present study reports on the application of modified groundnut shell as a new, easily prepared, and stable sorbent for the extraction of trace amount of Cr(III) in aqueous solution. 2-Hydroxybenzaldiminoglycine was immobilized on groundnut shells in alkaline medium and then used as a solid phase for the column preconcentration of Cr(III). The elution was carried out with 3 mL of 2 mol L(-1) HCl. The amount of eluted Cr(III) was determined by spectrophotometry using cefaclor as a complexing reagent and by flame atomic absorption spectrometry (FAAS). Different experimental variables such as pH, amount of solid sorbent, volume and concentration of eluent, sample and eluent flow rate, and interference of other metal ions on the retention of Cr(III) were studied. Under the optimized conditions, the calibration curves were found to be linear over the concentration range of 13-104 and 10-75 μg L(-1) with a detection limit of 3.64 and 1.24 μg L(-1) for spectrophotometric method and FAAS, respectively. An enrichment factor of 200 and RSD of ±1.19-1.49 % for five successive determinations of 25 μg L(-1) were achieved. The column preconcentration was successfully applied to the analysis of tap water and underground water samples.

Poly o-Toluidine Zirconium(IV) Iodosulfosalicylate-Based Ion-Selective Membrane Electrode for Potentiometric Determination of Cr(III) Ions and Its Analytical Applications

“…The electrode was successfully applied to direct chromium­(III) determination of tap water, underground water, and river water. Two other techniques, namely, FAAS and UV–vis spectrophotometry, were also used for this purpose . The results are obtained and presented in Table .…”

Optimization of species stability and interconversion during the complexing reaction for chromium speciation by high-performance liquid chromatography with inductively coupled plasma mass spectrometry

“…Chromium is a metal that exists in different oxidation states ranging from divalent to hexavalent, and typically occurs in two oxidation states in the natural environment and drinking water: trivalent chromium, Cr(III), and hexavalent chromium, Cr(VI) . Because of its wide use in manufacturing processes such as leather tanning, metal melting, electroplating, and chromate and chrome pigment production, large amounts of chromium compounds are released to the environment, which may contaminate source water and drinking water .…”