Title of Invention

A BROMATE 10N SENSITIVE ELECTRODE

Abstract

A process for the manufacture of a bromate ion sensing electrode comprising the steps of adding a solution of polyvinyl alcohol (PVA) in the range of 30 to 40wt% by volume of PVA in 1 liter of water to 20 wt% to 40% by weight of an inorganic precursor selected from silica, titanic, zirconia, derivatives thereof, to obtain a clear IIguld; adding to the said liquid 20 wt% to 50wt% polyoxometalates (including phosphomoybdic acid, phosphotungstic acid, sillicomolybdic acid, silicotungstic acid, phosphomolydocanadic acid) and refluxing the resultant at a temperature between 50˚C and 70˚C for 4 to 12 hours to obtain a clear viscous gel; coating the said gel on glassy carbon substrate and drying the same to obtain a thin film on the said substrate and thus obtain the said electrode.

Full Text

This invention relates to the manufacture of a bromate sensitive electrode and an electrode manufactured by said process. The electrode proposed herein is usefiil in detecting the presence of bromate ions in solutions The process for the manufacture of a bromate sensitive electrode, according to this invention, comprises the steps of selecting a solution from jy?^a solution of polyvinyl alcohol (PVA) in water in the range of 30 wt% to 40 wt% by volume of PVA in 1 lit of water ^^ adding to the selected solution 20 wt% to 40 wt% an inorganic precursorl(silica, titania, zirconia, derivatives thereof, to obtain a clear liquid; aooordmg to the said liquid 20 wt% to 50 vA % polyoxometalates (including phosphomolybdic acid, phosphotungstic acid, silicomolybdic acid, silicotungstic acid, phosphomolydovanadic acid), and refluxing the resultant at a temperature between 50° C to 70° C for 4 to 12 hours, to obtain a clear viscous gel, coating the said gel on glassy carbon and drying the same to obtain the said electrode. This invention will now be described in further detail by reference to the accompanying drawings, which illustrate the manner in which the bromate ion electrode proposed herein is used. 38 gms of PVA dissolved in 1000 ml of water and to this 62.5 ml of Tetraethyl othosilicate was added and refluxed for 30 min to obtain clear liquid. To the above mixture 25 gms of phosphomolybdic acid was added and refluxed at 70 C for 6 hours to obtain a clear viscous gel. The gel is coated on to a glassy carbon substrate and dried in an oven at 80 degree C for 2 minutes to obtain a thin film on the said substrate to obtain the electrode. The electrode so obtained is used in the following manner to identify the presence of bromate ion in a solution. The electrode was used to determine the concentration of bromate ions by chronoamperometry. One of the known processes of manufacture of a bromate ion electrode is briefly given hereunder The advantages of the process proposed herein and the electrode manufactured thereby, over the known processes and the electrodes manufactured thereby are: The proposed method is simple over existing methods. The available methods are expensive. We claim: 1. A process for the manufacture of a bromate ion sensing electrode comprises the steps of selecting a solution from (1) a solution of polyvinyl alcohol (PVA) in water in the range of 30 to 40 wt%/in 1 liter of water*adding to the selected solution of 20wt% to 40 wt% by weight of the said selected solution inorganic precursor selectiag from silica, titania, zirconia, derivatives thereof, to obtain a clear liquid; adding to the said liquid 20 wt% to 50 wt % polyoxometalates (including phosphomolybdic acid, phosphotungstic acid, silicomolybdic acid, silicotungstic acid, phosphomolydovanadic acid) and refluxing the resultant at a temperature between 50° C and 70° C for 4 to 12 hours/coating the said gel on glassy carbon and drying the same to obtain the said electrode. 2/ A procoss »s claimed in Claim i- wherein the said hydro?t>^ Dolvont ty ethai'iul 2* A process as claimed in Claim 1 or Claim 2 wherever the inorganic substance is tetraethyl ortho silicate. A proQess for the manufacture of a bromate ion sensitive electrode substantially as herein described and illustrated. A bromate ion sensitive electrode whenever manufactured in accordance with any one of the preceding Claims.

Documents:

215-che-2004-abstract.pdf

215-che-2004-claims duplicate.pdf

215-che-2004-claims original.pdf

215-che-2004-correspondnece-others.pdf

215-che-2004-correspondnece-po.pdf

215-che-2004-description(complete) duplicate.pdf

215-che-2004-description(complete) original.pdf

215-che-2004-form 1.pdf

215-che-2004-form 19.pdf

215-che-2004-form 26.pdf