International Journal of Chemical Studies Determination of Trace Amount of Cu (II) Using UV-Vis. Spectrophotometric Method (original) (raw)

Trace amount of Copper(II) has determined by spectrophotometric technique using 1-(2-pyridylazo)- 2-naphthal (PAN), as a new spectrophotometric reagent which is insoluble in water. PAN reacts in highly acidic solution at pH 2.40 to 2.50 with Cu(II) to give a pink chelate which has an absorption maximum (λmax.) at 550nm. The reaction is instantaneous and absorbance remains stable for over 48hrs. The average molar absorption co- efficient (e) was found to be 2.05×10 4 L mol -1 cm -1 and Sandell sensitivity is 3.23×10 −4 μg cm −2 . Linear calibration graphs were obtained for 0.1-4.0 μgL -1 of Cu(II) and RSD (%) is 1.16. The stoichiometric composition of the chelate is 1:2 (Cu:PAN). Large excess of over 50 cations, anions, and some common complexing agents (e.g. oxalate, phosphate, tartarate, thio-urea) do not interfere in the determination. The method was successfully used in the determination of Cu(II) in Several Standard Reference Materials as well as in some environmental and indust...

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