| 摘要 |
PROBLEM TO BE SOLVED: To obtain a measuring method by which the concentration itself of an element as an object to be measured can be measured, by using an electrochemical sensor, which measures the activity of the object to be measured in molten metal and computing the concentration by using a specific expression on the basis of a detected electromotive force and on the basis of the temperature of the molten metal. SOLUTION: An electrochemical sensor, which measures the activity of an object to be measured in a molten metal is used in such a way that a solid electrolyte, which is oxygen ion-conductive and an inorganic substance containing the oxide of an element identical to an element as an object to be measured, with which a subelectrode or the solid electrolyte is to be coated are combined or that a solid electrolyte, which contains the oxide of the element identical to the element as the object to be measured and which is oxygen ion-conductive is used. Then, on the basis of an electromotive force E detected by a sensor and on the basis of the temperature T of a liquid metal, the concentration [%M] of the element as the object to be measured is computed by an expression: log[%M]+C0 [%M]=C1 +C2 (E/T)+C3 /T-ΣCi[%X] (where C0 , C1 , C2 , C3 and Ci represent constant, and [%X] represents a solute element other tham a component M in the molten metal). |
