For the determination of individual dye concentrations in the mixture

especially in the case that the concentration of the mixture is too high and the absorbance system is to be nonlinear because of chemical changes such as hydrolysis and the interaction among the dyes

a novel determination method based on particle filter is proposed and a nonlinear absorbance model is developed.The feasibility and validity of this method can be verified by real examples.The numerical results for the determination of individual dye concentrations in the mixed reactive dye liquors by particle filter are compared to the results of the determination method based on extended Kalman filter

showing that the particle filter can produce better filtering effect than extended Kalman filter and the mean squared error(MSE)between its determinated results and actual values is less than 0.015.This demonstrates that the nonlinear absorbance model developed in this paper is accurate and the determination method based on particle filter is effective and feasible.