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Section 7. Optics and Turbidity Measurements

7-2

Can turbidity be converted to suspended solids concentrations and vise-

versa?

In most situations, conversions between turbidity and suspended solids

concentrations will give misleading results because the conversion equates to

an apparent optical property, in relative units, with one precisely defined in

terms of mass and volume; these are "apples and oranges".

Conversion of turbidity to suspended solids concentration is recommended

only when:

x Measurements are made with the same turbidimeter.

x The turbidimeter is intercalibrated with a turbidity standard and suspended

matter from the waters to be monitored.

x Particle size and composition do not change over the monitoring period.

Compliance with the last condition is crucial but virtually impossible to verify

in the field because it is difficult to sample particles in their natural state and

preserve them for laboratory analysis in a consistent and meaningful way.

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Campbell OBS-3A Spezifikationen Seite 46