Resistivity of Rocks
Defining resistivity as the property determining a material's ability to resist electrical current flow, this text explores how it varies in different soil and rock types due to factors like clay content and moisture level. It delves into electronic and electrolytic conductance, showing how rocks with metallic content or clay minerals affect electrical conduction. Additionally, it covers the wide range of resistivity values in natural soils and rocks, outlining the resistivity ranges for various Earth materials. Factors influencing resistivity, such as mineral composition and moisture content, are discussed in detail.
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Presentation Transcript
Conductivity, Salinity, TDS Conductivity is a measure of the water s ability to conduct electricity electricity Pure water is a poor conductor conductor of electricity poor electricity Salts and other inorganic chemicals form electrically charged particles charged particles called ions ions electrically Conductivity is a measure of the ionic strength ionic strength of water Anode Anode Cathode Cathode
Conductivity, Salinity, TDS Conductivity is usually reported as specific conductance conductance temperature compensated conductivity to 25 C specific
Conductivity, Salinity, TDS Conductivity probes detect the AC resistance resistance between two electrodes AC Salinity Salinity is then calculated from this conductivity value Anode Anode Cathode Cathode
Conductivity, Salinity, TDS Salinity Salinity is the total concentration of all dissolved salts dissolved salts in water water The most common ions ions in sea water sea water
Conductivity, Salinity, TDS Total dissolved solids (TDS) Total dissolved solids (TDS) combine the sum of all ion particles ion particles that are smaller than 2 microns EPA EPA recommends an upper limit of 500 mg/L TDS 500 mg/L TDS
Conductivity, Salinity, TDS Units of measure Units of measure Salinity Salinity Conductivity Conductivity TDS TDS ppt mS/cm uS/cm mg/L
Conductivity, Salinity, TDS INTERESTING FACT INTERESTING FACT The higher the dissolved salt concentration, the higher the density density of water. This increase in density density with salt levels is one of the driving forces behind ocean circulation ocean circulation
