Accession Number : AD0660032

Title :   ENHANCEMENT OF THE CONDUCTIVITY MODULATION EFFECT IN SALT SOLUTIONS.

Descriptive Note : Technical rept.,

Corporate Author : GEORGIA INST OF TECH ATLANTA ENGINEERING EXPERIMENT STATION

Personal Author(s) : Bonham,C. H. , III ; Rivers,W. K. , Jr

Report Date : 15 AUG 1967

Pagination or Media Count : 34

Abstract : The fractional change of conductivity of various inorganic and organic solutes added to aqueous sodium chloride solutions has been measured. Of the seven groups measured only the strong inorganic acids and bases and the weak organic acids and bases showed any enhancement; their addition produced a fractional change of conductivity, sigma, that was 1.4 dB greater than that for the plain sodium chloride solution. In the other groups there was no change of delta-sigma/sigma from that of salt water. All groups with the exception of weak organic acids and bases had a change in modulation index per unit pressure consistent with the measured conductivity and the theory of interaction. The value of the modulation index per unit pressure for weak organic acids and bases was 2.3 dB greater than that predicted. The measurements were made by reflecting electromagnetic and acoustic waves from the salt water surface in a coaxial test cell at a radio frequency of 147 MHz and an acoustic frequency of 17.5 KHz. The equipment used is capable of measuring an amplitude modulation index lower than 150 dB below 100 per cent for 1 Hz bandwidth. (Author)

Descriptors :   (*ELECTROLYTES, *ELECTRICAL CONDUCTIVITY), (*UNDERWATER SOUND, ELECTROLYTES), SODIUM CHLORIDE, SOLUTIONS(MIXTURES), ELECTRICAL PROPERTIES, MODULATION, ADDITIVES, BASES(CHEMISTRY), AMINO ACIDS, CARBOHYDRATES, CLEANING COMPOUNDS, ALCOHOLS, ETHERS, CARBOXYLIC ACIDS, SALTS, ELECTROMAGNETIC RADIATION, REFLECTION

Subject Categories : Physical Chemistry
      Acoustics
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE