Gallacetophenone Isonicotinolyhydrazone-A New Sensitive Reagent for Rapid Spectrophotometric Determination of Chromium (VI)

M. Ravinder¹ and K. Rajareddy²

¹Department of Chemistry, Chaitanya Degree College (Autonomous), Warangal - 506 001 (India).

²Department of Physical Sciences, KITS College, Warangal (India).

ABSTRACT:

Gallacetophenone isonicotinoyl hydrazone (GAPINH) forms a brownish yellow coloured soluble complex with chromium (VI) instantaneously at PH 2.70. The complex exhibits an absorption maximum at 420nm with a molar absorptivity of 1.57×104 litre mole-1 cm-1 and photometric sensitivity 0f 0.0033?g cm-2 ml-1. Beer,s law is valid over the concentration range 0.10 – 2.75 ppm of Chromium (VI) with an optimum concentration range of 0.50 – 2.60 ppm. A 5-fold molar excess of the reagent is necessary for the full development of the colour intensity. The stoichiometry between chromium and GAPINH is established as 1:1. The stability constant of the complex calculated from Job,s method was 1.56 × 105. The method is simple, sensitive and rapid.

KEYWORDS:

GAPIMH; spectrophotometry; chromium (VI)

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Copy the following to cite this article: Ravinder M, Rajareddy K. Gallacetophenone Isonicotinolyhydrazone-A New Sensitive Reagent for Rapid Spectrophotometric Determination of Chromium (VI). Orient J Chem 2009;25(1).

Copy the following to cite this URL: Ravinder M, Rajareddy K. Gallacetophenone Isonicotinolyhydrazone-A New Sensitive Reagent for Rapid Spectrophotometric Determination of Chromium (VI). Orient J Chem 2009;25(1). Available from: http://www.orientjchem.org/?p=23401