A part of the cross section has a thin-layer channel (12) formed of a solid sample (10) to be measured which causes interfacial reaction to be measured by contact with a liquid phase. The liquid phase is circulated through this channel (12) to simulate an actual environment wherein the solid sample (10) to be measured contacts the thin-layer liquid phase and to cause the interfacial reaction of the solid sample (10) and the liquid phase. Thus, the precise measurement concerning various solid-liquid interfacial reactions occurring in an actual environment is conducted by conducting measurement concerning the solid-liquid interfacial reaction caused by reproducing an actual environment. The thin-layer formation of the channel (12) enlarges the ratio of the area of the solid-liquid interface to the volume of the liquid phase in the channel (12) and results in a marked reduction in measuring time with a high-speed visualization of the interfacial reaction. Further, since the internal capacity of the channel (12) is very small, the quantity of a liquid phase used for measurement is markedly reduced.
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