Electric conductivity CPT's or EC CPT's are used to determine the electrical conductivity of the soil. On the basis of the conductivity, information can be obtained with regard to metal contaminations and / or an indication of the chloride content.
It should be noted that the indication of the chloride content is a derivative (calculated) of the conductivity and that this data only has a reliability of about 50%. EC probes are mainly used to determine the transitional area from fresh to brackish and possibly salt groundwater based on which further research (eg in the form of monitoring wells, drilling, ...) can take place. Because the electrical conductivity of a soil is dependent on the soil type, the standard probing parameters (point resistance, adhesive, slope) supplemented by the water pressure and the temperature are also taken into account during the execution of the conductivity probing.
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