Principle

In this experiment it is shown how the salt leaching of a disused potash dump drastically increases the salt concentration of a stream, how the salt content downstream only gradually decreases again and how the increased salt concentration can still be measured downstream after it flows into a river.

Benefits

• experiment is part of a complete solution with numerous experiments in the field of ecology
• Measurements possible indoors and outdoors, for mobile use
• Especially understandable and didactically prepared description of the experiment (relevance to everyday life, etc.) including protocol questions.
• Future-oriented teaching: Integration into digital science lessons with tablets or smartphones.
• Increased motivation of students by using the intuitive measureAPP.
• Increased media competence.

Tasks

1. measuring the conductivity of a flowing water at various points
2. compare measured values and make statements about the reasons for the changes

Learning Objectives

• Groundwater
• salt washout
• fertilisers
• anthropogenic influences