Extraction, Spectrophotometric and atomic Absorption Spectrophotometric Determination of Tellurium with N-Phenyl Benzohydroxamic Acid

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Abstract
Solvent extraction, spectrophotometric and atomic absorption spectrophotometric determination of tellurium-(IV) in nanogram levels are described. The tellurium(IV) forms yellow colored complex with N-phenylbenzohydroxamic acid (PBHA) which is extractable into chloroform from 7 M HCI04. Te-PBHA complex has a maximum absorbance at 345 nm with the molar absorptivity 3.5 × 104 1 mol−1 cm−1 and Sandell's sensitivity 0.00365 μg/cm2. The tellurium(IV) is also determined in the range of 0.01 – 0.08 ppm by flameless atomic absorption spectrophotometry using GEC HG 900 vapor generation accessay. Effect of molarity, reagent concentrntions, diverse ions on the extraction of tellurium complex were studied. The tellurium was determined in presence of selenium and also in standerd samples.