Abstract
A rapid, simple and sensitive spectrophotometer method for the determination of traces and ultra traces of tellurium(IV) were studied. These method were based on either the oxidation of leuco methylene green (LMG) to its blue form of methylene green by tellurium in acidic medium, the formed dye shows an absorption maximum at 650 nm in acetate buffer medium (pH 3.0 to 5.0). Beer’s law were obeyed in the concentration range 0.4‐2.5 µg mL-1, having molar absorptivity and Sandal’s sensitivity of 4.9×104 L mol-1 cm-2 , and 0.0026 µg cm-2, respectively. The optimum reaction conditions and other analytical parameters were investigated to enhance the sensitivity of the present method. The tolerance limit of various ions with this method has been studied. The proposed method was applied for the analysis of tellurium in spiked, river, lake, spring, waste water samples, plant materials and soil samples. The results obtained by the proposed method were superior to the reported method. The performances of proposed methods were evaluated in terms of student’s ‘t’‐test and variance ratio ‘f’‐test which indicates the significance of proposed methods over reported methods.
Highlights
The Tellurium and its compounds were widely used in thin films, rechargeable batteries and charge transfer systems etc
Stock solution containing 1 to 100 μg (0.03 – 3.5 mL-1) of tellurium were transferred into 25 mL calibrated flask and 5 mL of Leuco methylene green reagent (Scheme 1) mixture were added followed by 3 mL of Acetate buffer
The effect of pH on the peak height of tellurium(IV) at different concentrations was investigated with a fixed reagent concentration (1.0% leuco methylene green) in the pH range of 3.0 – 5.0 and the peak height was measured for each concentration level of tellurium(IV)
Summary
The Tellurium and its compounds were widely used in thin films, rechargeable batteries and charge transfer systems etc. Tellurium enters into natural water through seepage from soils and industrial waste Many analytical techniques such as Voltammetry[1], Flame atomic absorption spectrometry[2], Atomic absorption spectrometry[3,4], Inductively coupled plasma-mass spectroscopy[5,7], Inductively coupled plasma-atomic emission spectroscopy[8,9], X-ray fluorescence[10,11] and Electrophoresis[12] have been employed for tellurium analysis in various environmental matrices. This increased the interest in developing rapid, sensitive and simple methods for the determination of traces of tellurium. Determination of Tellurium(IV) in Various Environmental Samples green (from B.D.H., Poole, UK) was prepared by dissolving 1.0 g of leuco methylene green in water and diluted up to the mark in a 100 mL standard flask with deionised - double distilled water and the solution was refrigerated
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