CALIBRATION LIQUID SUBJECTED TO MEASUREMENT OF NITRATE NITROGEN BY ION ELECTRODE METHOD, PREPARATION METHOD OF CALIBRATION LIQUID MEASURING METHOD USING CALIBRATION LIQUID AND MEASURING INSTRUMENT USING CALIBRATION LIQUID

摘要

PPROBLEM TO BE SOLVED: To provide a method for simply measuring nitrate nitrogen with high precision by an ion electrode method without being affected by the ion intensity of a component other than nitrate ions or obstruction ions in the measurement of the concentration of nitrate nitrogen in crops such as vegetables or the like or soil, a measuring instrument of nitrate nitrogen, a calibration liquid subjected to the measurement of nitrate nitrogen and a preparation method of the calibration liquid. PSOLUTION: In the method of preliminarily and actually measuring a plurality of sample extraction liquids, using at least one calibration liquid, which contains nitrate ions in the concentration optimized and determined from the actually measured values and adjusted in conductivity by an electrolyte and setting crops such as vegetables or soil to a specific sample to measure the concentration of nitrate nitrogen in the specific sample, at least following processes are performed: (B1) the sample extraction liquids are prepared; (B2) calibration operation is performed; (B3) the concentration of nitrate ions in each of the sample extraction liquids; and (B4) the concentration of nitrate nitrogen in the specific sample is calculated. PCOPYRIGHT: (C)2008,JPO&INPIT