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Archive for March, 2012

Water PH in South Africa

Written by Janice M on . Posted in Water & Environmental

What is pH? The term pH derives from the French word, “pouvoir hydrogene” and means “hydrogen power”. pH is a measurement of the concentration of hydrogen ions in a solution. Because of its mathematical formulation, low pH values are associated with solutions with high concentrations of Hydrogen ions, whilst high pH values occur for solutions …

What type of Chemical Reagent should you choose for Water Tests?

Written by Janice M on . Posted in Technical Tips

Five different forms of chemical reagents are generally available for professional water quality tests. General Guidelines: For the most accurate results, tablet reagents are the best form of reagent. Lovibond tablets have a guaranteed shelf life of 5 or 10 years. Each tablet is sealed in foil, eliminating the possibility of indicator aging. Tablets also …

Should you use a Comparator (Colorimeter) or a Photometer for Measurement of Water Quality?

Written by Janice M on . Posted in Technical Tips, Water & Environmental

Comparator in use Colorimetric testing is a widely used method of water testing. A chemical reagent (eg. DPD tablets) is added to a known sample of water. The intensity of colour is then measured to determine the concentration of a particular chemical present in the water (eg. Chlorine). The concentration of the parameter can be …

Tests for Water – Turbidity

Written by Janice M on . Posted in Water & Environmental

What is Turbidity? Turbidity is a measure of sample clarity. The term is used to describe the cloudy or milky appearance of a liquid. Turbidity is due to particles of varying sizes scattering or absorbing light, giving the medium in question a cloudy appearance. High turbidity value is caused by particles such as silt, clay …

Water Testing – Phosphates in Water

Written by Janice M on . Posted in Water & Environmental

Phosphorus is a nutrient required by all organisms for the basic processes of life. It is a natural element found in rocks, soils and organic activity. Rainfall can cause varying amounts of phosphates to wash from the soil into waterways. Phosphates stimulate the growth of plankton and aquatic plants which provide food for fish. This …

Water Quality Analysis – Iron in Water

Written by Janice M on . Posted in Water & Environmental

Natural waters contain variable amounts of iron depending on the geological area and other chemical components of the waterway. Iron in groundwater is normally present in in the Ferrous form, Fe (II), which is soluble. It is easily oxidised to Ferric Iron Fe (III) or insoluble iron upon exposure to air. This precipitate is orange-coloured …

Water Quality Analysis – Chloride in Water

Written by Janice M on . Posted in Water & Environmental

Chloride ions, or ionized chloride atoms, are derived mostly from salt deposits that leech into water. Some common chlorides include sodium chloride (NaCl) and magnesium chloride (MgCl2). Fresh water has almost no chlorine ions whatsoever, whilst salt water from the ocean has the highest quantity of chloride ions. Many wells and water reservoirs can also …

Testing on Water – Ammonia Tests

Written by Janice M on . Posted in Water & Environmental

Why test for Ammonia? Ammonia is highly soluble in water. One volume of water will dissolve 1 300 volumes of NH3. Ammonia reacts with water to form a weak alkaline. Most Ammonia in the environment comes from fertilizers (sometimes in the form of Ammonium salts such as Sulfate and Nitrate. Large amounts are used in …


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