MATÉRIAU HYGIÉNIQUE, PROCÉDÉ DE MESURE DE CONTENU DE RÉSINE ABSORBANT L'EAU COMPRIS DANS UN ARTICLE ABSORBANT OU UN PRODUIT INTERMÉDIAIRE DANS SON PROCÉDÉ DE FABRICATION, ET PROCÉDÉ DE FABRICATION DE MATÉRIAU HYGIÉNIQUE OU D'ARTICLE ABSORBANT L'UTILISANT
Provided is a convenient, safe, and highly precise method for measuring a content of a water-absorbing resin in a hygienic material or an absorbent article.In a method for measuring a content of a water-absorbing resin, which has a water-soluble cation in the form of an ion-dissociating group, included in a hygienic material, an absorbent article, or an intermediate product in a manufacturing process thereof,A) a step for measuring an amount of a predetermined water-soluble cation in a reference sample including a known amount of the water-absorbing resin and creating a calibration curve indicating a relation between the amount of the water-absorbing resin and the amount of the predetermined water-soluble cation in the reference sample on the basis of the obtained measurement result；B) a step for measuring an amount of the predetermined water-soluble cation in a measurement sample, which includes a portion including the water-absorbing resin, of the hygienic material, the absorbent article, or the intermediate product in the manufacturing process thereof； andC) a step for calculating an amount of the water-absorbing resin in the measurement sample by the calibration curve created in the step A) from the amount of the predetermined water-soluble cation measured in the step B) are performed. The step A) and the step B) include measuring the amount of the predetermined water-soluble cation using an ion selective electrode method and include the following steps M1) and M2):M1) a step for immersing a sample in an aqueous solution including a total ionic strength adjusting agent (pre-processing step)； andM2) a step for measuring the amount of the predetermined water-soluble cation in a pre-processed supernatant liquid obtained in the step M1).
