2.4  Water quality assessment

Many analytical methods are used to test for the presence and concentration of possible contaminants in water. Concentration is the measure of the quantity of a substance dissolved in a known volume of water. For water quality assessment, the units used are usually milligrams per litre, which is written as mg/l, or mg l–1.

2.3.5  Amoebic dysentery

2.4.1  Microbiological tests