Abstract
Excess sound absorption in sea water arises mainly from chemical relaxations involving MgSO4 and B(OH)3. The high‐frequency (100 kHz) MgSO4 relaxation has been identified as a multistep ion‐pair process. The low‐frequency (1kHz) and B(OH)3 relaxation apparently involves more complex interactions with other constituents. To investigate B(OH)3 interactions in a simpler system, we measured absorption in NH3 solution using the resonator method. We have found αmax to be proportional to the product of NH4+ and B(OH)4− concentrations; however, the magnitude is much too large to be caused by the ion pair. The mechanism, probably similar to that in sea water, resembles catalysis, the absorption being governed by the large volume change of the faster NH3/NH4+ equilibrium and the relaxation frequency by the slower B(OH)3/B(OH)4− equilibrium. [Work supported by NUSC and DARPA.]
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