Further studies of hydrolysis of MgH2-GLM and MgH2-Ni/GLM composites in 0-0.3 M aqueous solutions of citric acid at the room temperature were performed at FRC PCP MC RAS using volumetric setup shown in Figure . Despite simple layout and certain inconvenience of manual datalogging, the setup allowed to collect precise integral data on hydrogen evolution during the whole time of the process due to direct measurement of the amount of released H2 using gas burette (6b). The sample (2; m=30 mg) was placed in a 3-neck 1 Since the rates of hydrogen generation at the acid concentrations above 1 wt.% were very close for the different temperatures (see Section 3.2 below), kinetic analysis was not applied for these data.