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Report No.

Preliminary examination of disturbance influence of groundwater chemistry on colloidal characterization in groundwater

Kuno, Yoshio; Sasamoto, Hiroshi   

In this study, the influence of chemical difference between in-situ condition and atmospheric condition on inorganic colloids was evaluated by carrying out the characterization of groundwater colloids in the Horonobe area. Remarkable amount of suspended substance including mainly Ca was observed in the groundwater collected from the HDB-10 borehole. Additional laboratory experiments were therefore conducted using this groundwater to investigate the impact on the groundwater composition and the colloidal properties by exposing to the atmosphere. Not only precipitation but also suspended particles composed mainly of CaCO$$_{3}$$ were generated under the atmospheric condition. From the prediction using the DLVO theory, however, the suspended particles are not expected to have a dispersive stability in this groundwater. Formation of suspended particles seems to be a transient behavior caused by the change of chemical conditions and these particles would not exist in in-situ groundwater.



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