Acidity changes of a watercourse

Продукт No: P1520862


The pH value (a measure of the concentration of hydrogen ions) in running waters depends on the geological conditions, the pollution load that is caused by agricultural production, and on plant activities. This experiment shows how the pH value of a stream changes even at a short distance and just a few kilometres away from the spring.


  • Experiment is part of an experiment set with numerous experiments in ecology
  • Universal handheld measurement device can also be used for other measurement parameters relevant in ecology, biology and chemistry
  • Outdoors measurement possible, for mobile use
  • Graphical display of measurement data
  • Data can be saved on SD memory card
  • All data can be transferred onto a computer for data analysis
  • Data analysis software can be freely distributed


  1. Measurement of the pH values of a watercourse at different locations
  2. Comparison of the pH values
  3. Comparison with other exemplary water bodies

What you can learn about

  • Factors influencing the pH value of water bodies
  • pH decrease effect of plant activity
  • pH value of rainwater


Перечень материалов (вы́писка) Продукт Количество
Cobra4 Mobile-Link 2 incl. accessories: battery, USB cable, charger and SD memory card 12620-10 1
Cobra4 Sensor-Unit pH, BNC connector 12631-00 1
Buffer solution tablets pH4, 100 30281-10 1
Buffer solution tablets pH10, 100 30283-10 1
Protection sleeve for electrode with a diameter of 12 mm 37651-15 1
Water, distilled 5 l 31246-81 1
Wash bottle, plastic, 500 ml 33931-00 1
Beaker, 250 ml, low form, plastic 36013-01 2

Литература по данной статье

Название Продукт Язык
Handbuch Schüler- und Lehrerversuche Cobra4, Physik, Chemie, Biologie, Alltagsphänomene, TESS und DEMO 01330-01 DEU
TESS and Demo advanced Manual Cobra4 Physics, Chemistry, Biology, Everyday Science 01330-02 ENG
Handbuch Schülerversuche Cobra4 Umwelt und Freiland, TESS advanced Biologie 12622-01 DEU
TESS advanced Applied Sciences manual Cobra4 Environment and Outdoors 12622-02 ENG
Schülerversuche Umwelt und Freiland mit Cobra4, Gerätesatz für 4 Arbeitsgruppen, TESS advanced Biologie 12626-88
Schülerversuche Umwelt und Freiland für Tablets, Gerätesatz für 4 Arbeitsgruppen, TESS advanced Biologie 15626-88

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Продукт No: P1520862

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