Abstract: According to the present invention, the changing rate of the predetermined component concentration is determined, based on the difference between the predetermined component concentration in a chemical treating solution (a plating solution) which is analyzed this time and the predetermined component concentration analyzed last time, both measured by an analytical means, and the difference of each sampling time for analysis of each component concentration by the analytical means (140). Subsequently, the correction amount for the analyzed result of this time based on the changing rate obtained above and the elapsed time from the sampling point of time of the plating solution of this time for analysis of the plating solution by the analytical means to the current point of time (150), and then the analyzed result is corrected based on the resulting correction amount to compute or calculate the current concentration (160).

Abstract: The object of the present invention is to develop an innovative mud material which has the properties of a resin-type mud material for improving the working environment, which mud material is capable of increasing the depth of an iron tap hole and of improving the adhesion to mud material deposited in a furnace at high heat, such adhesion being a drawback of the conventional art.This invention provides a mud material used for an iron tap hole in a blast furnace, wherein 8 to 20 wt % of a solution of a novolak-type phenolic resin having a specific number-average molecular weight and serving as a binder is added to and blended with a refractory aggregate used as a conventional mud material.