Patent ID: 8377694

Claim:
Method for the calibration of at least one measurement device for measuring the total organic carbon (TOC) content of an aqueous solution containing carbon, by measuring the resistivity of said solution at a given temperature, after oxidation of the carbon that it contains to CO 2 , said method comprising at least the following series of steps, in the presence of a reference TOC analyzer: (a) Producing a calibration point by measuring the resistivity of ultra-pure water using said at least one measurement device and said TOC analyzer, the resistivity having an established value equal to 18.2 MΩ.cm for a TOC equivalent value of zero, (b) Producing a plurality of calibration points, the number of calibration points comprising 5 to 35, each calibration point corresponding to a measurement of the resistivity of a solution of a photo-oxidizable compound in ultra-pure water, having a given content of photo-oxidizable compound, said solution of photo-oxidizable compound having been oxidized, resistivity measurements being carried out by the measurement device and by the TOC analyzer, these calibration points establishing a correlation between the resistivity values measured by the TOC measurement device and those measured by the TOC analyzer; and (c) Correcting the TOC measurement device for calibration purposes by at least one algorithm, on the basis of the measurements carried out in the previous step, by using at least one algorithm which carries out a comparison between the resistivity values of the TOC analyzer and those measured by the TOC measurement device, for each given TOC value of a series of aqueous solutions having different TOC contents, followed by the use of at least one algorithm which restores the resistivity values of the TOC measurement device as a function of the reference resistivity values given by the TOC analyzer.