Ecology

Membrane filter method

Sound perception and sound level measurement

Dependence of the soil temperature on the structure and wa-ter content of the soil

Principle

This experiment covers the separation and analysis of traces of sand, clay and humus in soil. These substances, both mineral and organic, appear in various types of soil and have a major effect on soil properties. The quantity of humus is the basis for the ...

Humidity preferendum of soil arthropods

Principle

Heat radiated by a lamp gradually causes soil to dry out. That and the light emitted cause any creatures in a sample to burrow to the bottom where they are sieved into a funnel and collected inside a vessel. The vessel contains moist filter paper in order to capture ...

Electrometric determination of dissolved oxygen in water

Hydrogen ion concentration of water

Water purification by filtration with active carbon

Principle

Active carbon is a good absorbent and as such is excellent when used as a filter. During water treatment, for example, active carbon filters are used to remove pesticides and detergents (soap and washing-up liquid). The cleansing of water can be demonstrated im ...

Air pollution through uncontrolled waste burning

Influence of temperature on the germination and growth of cress

Eight petri dishes are filled nearly to the brim with finely sieved, moist garden soil and 50 cress seeds are planted in each one. They are then placed inside a device which keeps each of the samples at a different temperature, whereby they are evenly distributed between cold and warm regio ...

Effect of heavy-metal ions on the activity of enzymes

Water quality - contamination with heavy metals

Principle

Heavy-metal ions may be carried into surface or ground water from mining fields or via the waste water of galvanicor similar production sites. They block the effect of enzymes so that the processes in the metabolism of the organisms that are controlle ...

Water quality - contamination with heavy metals

Principle

Demonstration experiment using wireless data transmission to a large digital to display. Heavy metal ions can seep into water courses, for example from galvanising plants or other similar industries. They have the effect of suppressing the action of enzyme ...

Drinking water

Electrostatic flue gas cleaning

Principle

This experiment modelling the principal functions of an electrostatic filter can also be set up conveniently as a complete experiment on the comprehensive experiments panel.

Model experiment on the desulphurisation of flue gas

Principle

German coal contains an average of one tonne of sulphur per 100 tonnes of coal. During combustion, this generates in about two tonnes of sulphur dioxide. Thus, a large 700-megawatt power plant which burns about 200 tonnes of coal per hour produces about 100 ...