| 摘 要： | The dependencies of sound absorption on pH value of B(OH)_3/CO_2/Ca/NaCl,B(OH)_3/CO_2/Ca/Mg/NaCl and Mg/CO_2/Ca/NaCl systems are measured at 2.9 and 6.8 kHz by the cylindrical resonatormethod.The concentration of each constituent in these systems is the same as that in Lymanand Fleming sea water.Measurements are made at atmospheric pressure and 12.4℃.Results showthat the relaxation frequency of B(OH)_3 is independent of the pH value in the seawater.It seemsclear that there is another low frequency relaxation caused by MgHCO_3~+(f_r～3.5 kHz)in theB(OH)_3/CO_2/Ca/Mg/NaCl system.The relaxation parameters of the B(OH)_3,MgCO_3 and MgHC0_3~+relaxations for various systems are given.
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