1965 年 85 巻 8 号 p. 693-699
The quantity T to be measured by a turbidimeter equipped with an integrating sphere is the ratio of diffuse transmitted light to that of total transmitted light, corrected by a term due to turbidity of the medium and condition of the apparatus. In a turbid colored system, the T value decreases slightly as absorption increases, because the path length of diffuse transmitted light is a little longer than that of parallel transmitted light.
The correction factor F is the ratio of T for colored system to that for colorless system containing the same scattering particles. As a result of experiment using 0.3% sodium lauryl sulfate solution of a latex and Methyl Orange, the factor F could be expressed as a function of optical density D and T value for the colored system: F=A1-A2D+A3T+A4DT. This expression was supported by a theoretical calculation where Rayleigh equation is applicable.
It was concluded that when a certain turbid colored solution is given, T value for a colorless system can be obtained from optical density D and T for the colored turbid system if the coefficients in the factor F were determined beforehand about this turbid system.