METHOD AND APPARATUS FOR INJECTING SAMPLE LIQUID IN CONTINUOUS COULOMETRIC ANALYSIS

PURPOSE:To maintain electrolyte in a measuring cell at a constant quantity all the time, by automatically injecting sample liquid in the measuring cell, and automatically discharging the electrolyte corresponding to the quantity of the injected sample liquid out of the measuring cell at the same time to the outside of this system. CONSTITUTION:A through holes 17' at one side of rotated disc 20 is filed with sample liquid. The sample liquid is dilluted with electrolyte 1, which is circulated in a liquid sending path 5 by a circulating pump 22, and injected into a measuring cell 2 through the liquid sending path 5. At the same time, the electrolyte 1, which is put in another through hole 17 of the rotated disc 20, is discharged to the outside of this system through a liquid discharge path 6 naturally or by a liquid discharging pump. The through holes 17 and 17' of the rotated disc 20 have the same volume. The electrolyte 1 which has the quantity corresponding to the quantity of the sample 3 injected in the cell 3 is discharged to the outside of this system. Therefore, the quantity of the electrolyte 1 in the cell 3 can be kept at the constant quantity all the time even if continuous measurement is repeated.