Abstract
In order to measure the turbidity of the colored solutions, we must know not only the scattering coeffi cient but also the absorption coefficient, for the scattered light from a point in solutions is absorbed within the sample cell. Then we have constructed an instrument as indicated in Fig. 3, which can be used to measure the intensity of the scattered and transmitted light. Using the peculier constants for the instrument k, a, b and c, we can get the ratio X as Eq. (5), which is the scattered light intensity divided by the transmi tted intensity, and when the extinction coefficient is small, it becomes to Eq. (6) approximately. Therefore we can express the scattering intensity of the solution by X, which is measured by reading the intensity of the scattered light when we adjust the incident light intensity to make the transmitted intensity a cons tant value. The limits of the approximations have been discussed and the examples of the measurement have been shown.
