Turbidity measurements see also Section

In practical water analysis, turbidity measurements on a visual basis are made for orientation purposes immediately after sampling (Chapter 1). 

However, turbidity measurements are also important when untreated water is purified to obtain drinking water. If the untreated water available for purification is surface water, for example, then flocculation using suit- 

In addition to pH and p- and m-values (see Chapter 1 and Section 3.2), turbidity measurements are also used in the appraisal of water quality. Instruments which make use of the absorption of a beam of light passing through a turbid solution have become widespread in practice. 

Scattered light measurements are also used in turbidity analysis. The 

Fresenius et al. (eds.), Water Analysis Springer-Verlag Berlin Heidelberg 1988 

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