PROBLEM TO BE SOLVED: To provide a hydrogen content reduction inhibitor capable of inhibiting reduction of hydrogen content over a long period of time when hydrogen is dissolved and/or dispersed in a liquid solvent, a hydrogen content reduction inhibition method of a hydrogen containing liquid and a manufacturing method of the hydrogen-containing liquid.SOLUTION: There is provided a hydrogen concentration reduction inhibitor of a hydrogen-containing liquid for addition to the hydrogen-containing liquid which is a liquid solvent containing hydrogen, the hydrogen concentration reduction inhibitor containing bivalent metal cations, especially a calcium ion and a magnesium ion as active ingredients.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】液体溶媒中に水素を溶解及び/又は分散させた場合に、長時間に亘り水素含有量の低下を抑制し得る水素含有量低下抑制剤及び水素含有液の水素含有量低下抑制方法、並びに水素含有液の製造方法を提供する。【解決手段】水素を含有する液体溶媒である水素含有液に添加するための水素含有液の水素濃度低下抑制剤であって、二価金属陽イオン、特にカルシウムイオンとマグネシウムイオンを有効成分とする水素含有液の水素濃度低下抑制剤を提供する。【選択図】図1
