Spectrometric characterization of suspension liquid and light extinction model update

On the basis of the classical light scattering models, the light extinction model is the first to establish as [Formula: see text] (ϕ, N and γ - average diameter in μm, number and relative refractive index of the suspending particles, λ, A and δ - incident light wavelength in μm, absorbance and optical path in cm of the suspension liquid) by spectrometric characterization of ten standard suspension liquids. It has been used to determine the suspending particles in the calcium oxalate, Formazine, soil, milk and sewage suspension water samples. As the result, the light extinction model method brought out less than 12% error of ϕ and 18% error of the suspending particles' quality by comparing with the conventional methods. It provides a simple and reliable spectroptometric determination of a suspension liquid. Also, it is very potential to in-situ monitor the growth and working state of the suspending particles using in synthesis of materials, culture of cells, treatment of wastewater and safety of drinking water and foods.