Abstract：Three common methods are used to prepare HRW. The best conditions of each method and the preservation of HRW are explored to provide reference for the selection of related research. HRW was prepared by using magnesium based hydrogen storage alloy balls (200， 300， 400， 500 particles)， hydrogen-rich stick (1， 2， 3 rods) and electrolytic hydrogen production kettle. The hydrogen concentration and ORP value of HRW prepared under different hydrogen production times， single preparation solution volume and temperature conditions were measured. In addition， the optimal hydrogen production method was used to prepare two equal volumes of HRW， with one cup closed and one cup opened. The hydrogen concentration and ORP value of the solution in the two cups were measured at 15 min， 30 min， 45 min， 1 h， 2 h， 4 h， 6 h， 12 h， 24 h and 48 h， and the best preservation methods of HRW were analyzed and compared. The hydrogen concentration in water increased when the number of magnesium based hydrogen storage alloy balls increased， the number of hydrogen rods increased， and the times of hydrogen production in electrolytic hydrogen production kettle increased. When the volume of solution in electrolytic hydrogen production kettle increases， the hydrogen content in HRW decreases. The temperature of solution in electrolytic hydrogen kettle does not affect the concentration of hydrogen production. Compared with the open cup， the hydrogen concentration of HRW in the closed cup decreases more slowly. The HRW preparation time used magnesium based hydrogen storage alloy balls and hydrogen-rich sticks is relatively longer than electrolytic hydrogen production kettle. The hydrogen concentration of 500 magnesium based hydrogen storage alloy balls can product higher than 1.0 ppm after 12 h， and the hydrogen concentration of more than 1.5 ppm can be prepared by three hydrogen-rich sticks after 48 h， which is suitable for the situation with high requirements for the concentration of HRW. Electrolytic hydrogen rich kettle can produce HRW with hydrogen concentration of about 0.6 ppm in 6 min. It is convenient and quick to use， and can be prepared in big volume in a short time. It is suitable for the situation with the concentration of HRW is low. The closed container is more conducive to the storage of HRW， but it should not exceed 48 h. It is recommended that the HRW to prepared when using.
2023, Vol. 36 
