Abstract: A communication system (100) includes: a plurality of stacked containers (2) having conductivity; and a plurality of electric field communication terminals (5) attached to the containers (2) in such a manner as to perform electric field coupling with any of the plurality of containers (2), in which the plurality of containers (2) includes a container (2) that contains a sensing terminal (4) that acquires sensing data, the plurality of electric field communication terminals (5) includes a first electric field communication terminal (5) attached to an inner side of the container (2) in which the sensing terminal (4) is contained, and a second electric field communication terminal (5) attached to an outer side of at least one container (2) of the plurality of containers (2), and the first electric field communication terminal (5) transmits the sensing data from the sensing terminal (4) to the second electric field communication terminal (5) via the plurality of containers (2).

Abstract: A iodine-measuring method for determining or detecting iodine concentration in a specimen, comprising a specimen-pretreating step of thermally digesting a specimen together with an oxidizing agent, and a subsequent reaction-measuring step of reacting the resultant with an arsenious acid reagent solution and an ammonium cerium sulfate reagent solution and measuring absorbance in the reaction solution, characterized in that the specimen-pretreating step is performed by heating and cooling treatment under an airtight condition.