Electrochemical chlorine sensor

Details Electrochemical chlorine sensor Electrochemical chlorine sensor

2006-08-28

2008-10-21

Olsen, Kaj K (Department: 1795)

Electrolysis: processes, compositions used therein, and methods

Electrolytic analysis or testing

For halogen or halogen containing compound

C205S779500, C204S400000, C204S405000

Reexamination Certificate

active

07438796

ABSTRACT:
A sensor for measurement of free chlorine and of total chlorine in aqueous solution including a working electrode having a self-assembled monolayer (SAM) formed on the surface thereof, producing a barrier which reduces the generation of background currents when electrical potentials are applied to the electrode, and blocks the reduction or oxidation of interfering species in the solution, is described. Such SAMs have also been found to block the efficient reduction of chlorine as well. However, N,N-diethyl-p-phenylenediamine (DPD) has been found to effectively transport electrons across the SAM; that is, an oxidized form of DPD produced by a reaction with chlorine is capable of penetrating the SAM such that the reduction of the oxidized DPD species can occur. The generated reduction current is correlated with the concentration of chlorine in solution. Total chlorine may be determined by the addition of an iodide salt.

REFERENCES:
patent: 2005/0191429 (2005-09-01), Buck
Allen et al, J. Electroanalytical Chemistry, 178, 1984, pp. 69-86.
Jiye Jin, et al., “A Miniaturized FIA System for the Determination of Residual Chlorine in Environmental Water Samples”, Analytical Sciences, Jan. 2004, vol. 20, pp. 205-207.
E. Hugo Seymour, et al., “Reaction with N,N-Diethyl-p-phenylenediamine: A Procedure for the Sensitive Square-Wave Voltammetric Detection of Chlorine”, Electroanalysis 15, No. 8 (2003), pp. 589-694.
Philip T. Radford, et al., “A Signal Amplification scheme for Ultrasensitive Amperometric Detection in Flowing Streams”, Analytical Chemistry, vol. 71, No. 22, Nov. 15, 1999, pp. 5101-5108.
Abraham Ulman, “Formation and Structure of Self-Assembled Monolayers”, Chem. Rev., 96, pp. 1533-1554 (1996).

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