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.
Highlights
The detailed investigation of a sensitive spectrophotometric method for the determination of trace amounts of tellurium (IV) is described
The effect of pH of the final reaction solutions is studied by adding different volumes of (0.01) M HCl or NaOH to the mixture containing 50 μg of tellurium (IV) and 5 ml of 1×10-4M Chrome Azurol S (CAS)
The spectrum was scanned for each coloured solution against its corresponding reagent blank, blank against distilled water and the final pH was measured
Summary
The above reagent has been used to determine indium (Poledniok and Buhl, 2006), vanadium (IV) (Starczewska, 2004) and cobalt (Mushran et al, 2004) as ternary (in the presence of surfactant) or as binary complexes. To the best of our knowledge, such investigation has not yet been touched
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