Conductive polymer film doped by mixed heteropolyanions usable for the detection of nitrite ions, nitrogen monoxide or a substance containing NO
First Claim
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1. A process for amperometric detection of nitrite ions, nitrogen monoxide or a substance containing a NO group present in a sample, which comprises the steps of:
- providing a sensor having a first electrode, a second auxiliary electrode, and a third reference electrode that are immersed in an aqueous solution contained in an enclosure,introducing the sample into the aqueous solution,applying a potential between the first and third electrodes, andmeasuring the electric current flowing between the first and second electrodes, wherein the first electrode comprises an electrically conductive support coated with an electronically conductive polymer film doped by mixed heteropolyanions complying with one of the formulas;
space="preserve" listing-type="equation">[M.sup.III X.sup.1 W.sub.11 O.sub.39 (H.sub.2 O)].sup.n- and
space="preserve" listing-type="equation">[M.sup.III X.sub.2.sup.2 W.sub.17 O.sub.61 (H.sub.2 O)].sup.7-in which M represents Fe, Rh, Al, Ga, In or Tl,X1 represents P or As and is equal to 4,X1 represent Si or Ge and n is equal to 5, orX1 represents B and n is equal to 6, andX2 represents P or As, provided that X1 does not represent Si when M represents Fe and wherein the mixed heteropolyanions catalyze the reduction of the nitrite ions, nitrogen monoxide or a substance containing a NO group.
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Abstract
The invention relates to the amperometric detection of nitrite ions and nitrogen monoxide by electrocatalytic reduction by means of electrodes (15) modified by an electronically conductive polymer film such as poly-(N-methyl pyrrole) doped by mixed heteropolyanions of formulas:
[M.sup.III X.sup.1 W.sub.11 O.sub.39 (H.sub.2 O)].sup.n- or
[M.sup.III X.sub.2.sup.2 W.sub.17 O.sub.61 (H.sub.2 O)].sup.7-
in which M represents Fe, Rh, Al, Ga, In or Tl,
X1 represents P or As and n is equal to 4,
X1 represents Si or Ge and n is equal to 5, or
X1 represents B and n is equal to 6, and
X2 represents P or As.
It also relates to the films and modified electrodes used.
11 Citations
10 Claims
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1. A process for amperometric detection of nitrite ions, nitrogen monoxide or a substance containing a NO group present in a sample, which comprises the steps of:
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providing a sensor having a first electrode, a second auxiliary electrode, and a third reference electrode that are immersed in an aqueous solution contained in an enclosure, introducing the sample into the aqueous solution, applying a potential between the first and third electrodes, and measuring the electric current flowing between the first and second electrodes, wherein the first electrode comprises an electrically conductive support coated with an electronically conductive polymer film doped by mixed heteropolyanions complying with one of the formulas;
space="preserve" listing-type="equation">[M.sup.III X.sup.1 W.sub.11 O.sub.39 (H.sub.2 O)].sup.n- and
space="preserve" listing-type="equation">[M.sup.III X.sub.2.sup.2 W.sub.17 O.sub.61 (H.sub.2 O)].sup.7-in which M represents Fe, Rh, Al, Ga, In or Tl, X1 represents P or As and is equal to 4, X1 represent Si or Ge and n is equal to 5, or X1 represents B and n is equal to 6, and X2 represents P or As, provided that X1 does not represent Si when M represents Fe and wherein the mixed heteropolyanions catalyze the reduction of the nitrite ions, nitrogen monoxide or a substance containing a NO group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification