Patent ID: 8888989

Claim:
A method of measuring electrolytes by an electrolyte measuring apparatus having: a measuring portion for measuring electromotive forces generated by a reference fluid and a sample solution, respectively, by the use of an electrode portion having working electrodes and a reference electrode; a dilution vessel for preparing the sample solution by diluting a sample fluid with a diluting fluid; reference fluid supply means for supplying the reference fluid into the dilution vessel; diluting fluid supply means for supplying the diluting fluid into the dilution vessel; sample supply means for supplying the sample fluid into the dilution vessel; and measured fluid supply means for supplying the reference fluid and the sample solution alternately to the electrode portion from the dilution vessel; comprising two processes each including four steps performed in turn: (1) causing the reference fluid to be supplied to and wasted from the dilution vessel, (2) supplying the reference fluid again into the dilution vessel, (3) sending the reference fluid to the measuring portion from the dilution vessel and measuring the resulting electromotive force, (4) wasting the reference fluid from the dilution vessel, (5) causing the diluting fluid to be supplied to and wasted from the dilution vessel, (6) supplying the diluting fluid and the sample fluid into the dilution vessel to prepare a sample solution, (7) sending the sample solution to the measuring portion from the dilution vessel and measuring the resulting electromotive force, and (8) wasting the sample solution from the dilution vessel, wherein, when the reference fluid and the sample solution are alternately supplied to the electrode portion and measured, a given amount of the diluting fluid is supplied to and wasted from the dilution vessel prior to the preparation of the sample solution.