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Spectrophotometric Determination of Tellurium (IV) with Chrome Azurol S: Application to Sea Water and Synthetic Alloys | ||
| Rafidain Journal of Science | ||
| Article 2, Volume 24, Issue 11, 2013, Pages 10-22 PDF (0 K) | ||
| DOI: 10.33899/rjs.2013.80278 | ||
| Authors | ||
| Wadala A. Bashir; Ghaida K. Hanna; Sadallah T. Sulaiman | ||
| Abstract | ||
| The detailed investigation of a sensitive spectrophotometric method for the determination of trace amounts of tellurium (IV) is described. The method is based on the reaction of tellurium (IV) with chrome azurol S in the presence of cetylpyridinium chloride hydrate surfactant at a final pH of 3.1 to form a pink coloured chelate absorbing maximum at 525 nm. Beer’s law is obeyed over the range (5-50) µg/25 ml, with a molar absorptivity of (2.5 ×104) l.mol-1.cm-1 and a coefficient of determination (r2) of 0.9997. Sandell’s sensitivity index is (5.104×10-3) µg.cm-2, a relative error of (0.8-0.2%) and a relative standard deviation of (0.2 to ±1.8) %, depending on the concentration levels in the calibration curve. The method has been applied successfully to determine Te (IV) in sea water and some synthetic alloys. | ||
| Keywords | ||
| Determination; Chrome azurol S reagent; Cetyl pyridinium chloride hydrate; Spectrophotometry | ||
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