Patent ID: 8123921
Filing Date: 2012-02-28
Classification: G01N,Y10T

Abstract:
1. A method for preparing a liquid sample for NMR spectroscopy using a combined titration and pH electrode having an electrode rod for a pH meter, the method comprising the steps of: a) positioning the electrode rod in a substantially vertical orientation with a measuring end thereof facing downwardly, the electrode rod measuring end being structured for immersion into the liquid sample, wherein the electrode rod comprises a pH measuring element disposed in the measuring end, electrical feed lines extending in the electrode rod to the pH measuring element, an acid capillary extending within the electrode rod for feeding an acidic fluid into the liquid sample, the acid capillary having an acid outlet opening in a bottom of the measuring end, a base capillary extending within the electrode rod for feeding a basic fluid into the liquid sample, the base capillary having a base outlet opening in the bottom of the measuring end, and a gas capillary extending within the electrode rod for feeding a gas into the liquid sample, the gas capillary having a gas outlet opening in the bottom of the measuring end; b) immersing the measuring end into the liquid sample following step a); c) discharging gas out of the gas opening following step b); d) measuring a pH value of the liquid sample following or during step c); e) if results of step d) indicate a measured pH value which exceeds a desired pH value, discharging acid out of the acid opening; f) if results of step d) indicate a measured pH value which is less than a desired pH value, discharging base out of the base opening; g) repeating steps c) through f) with the measuring end remaining immersed in the liquid sample until the measured pH value substantially equals the desired pH value.