Turbidimetry

In turbidimetry (not to be confused with the nephelometry ) the transmission or absorption of the light is measured by a suspension of rainfall during a titration. As an ideal example, the reaction of Ba2 with would be to call SO42 -to BaSO4. Here, the reaction mixture until the equivalence point is always cloudy. To the cloudy solution, the light is scattered primarily and not absorbed. According to the equivalence point, the turbidity changes (and thus the light scattering ) is no longer, as no further precipitate is formed. Because the scattering depends on the particle size, the reaction in a very reproducible way, must be performed in order to obtain accurate results. A mixture of glycerol and alcohol is used to stabilize the particles and prevents rapid settling of the solids.

Turbidimetric and nephelometric titrations are not very precise, because the end-point detection on the particle size, which is not really reproducible. The sensitivity is very good; may in the above example, sulfate can be determined even in the ppm range.