*Collect. Czech. Chem. Commun.*
**1979**, *44*, 2064-2078

https://doi.org/10.1135/cccc19792064

### Application of the turbidity ratio method in the spherical particle size determination in the range *m* ∈ <1.001, 1.315> and α ∈ <0.05, 100>

**Blahoslav Sedláček**

^{a}, Břetislav Verner^{a}, Miroslav Bárta^{b}and Karel Zimmermann^{a}
^{a} Institute of Macromolecular Chemistry, Czechoslovak Academy of Sciences, 162 06 Prague 6^{b} Power Research Institute, 250 97 Prague 9-Bechovice

### Abstract

Basic scattering functions were used in a novel calculation of the turbidity ratios for particles having the relative refractive index *m* = 1.001, 1.005 (0.005) 1.315 and the size α = 0.05 (0.05) 6.00 (0.10) 15.00 (0.50) 70.00 (1.00) 100, where α = π*L*/λ, *L* is the diameter of the spherical particle, λ = Λ/μ_{1} is the wavelength of light in a medium with the refractive index μ_{1} and Λ is the wavelength of light *in vacuo*. The data are tabulated for the wavelength λ = 546.1/μ_{w} = 409.357 nm, where μ_{w} is the refractive index of water. A procedure has been suggested how to extend the applicability of Tables to various refractive indices of the medium and to various turbidity ratios τ_{a}/τ_{b} obtained with the individual pairs of wavelengths λ_{a} and λ_{b}. The selection of these pairs is bound to the sequence condition λ^{a} = λ_{0}χ^{a} and λ_{b} = λ_{0}χ^{b}, in which b-a = δ = 1, 2, 3; a = -2, -1, 0, 1, 2, ..., b = a + δ = -1, 0, 1, 2, ...; λ_{0} = λ_{a=0} = 326.675 nm; χ = 546.1 : 435.8 = 1.2531 is the quotient of the given sequence.