Applications Of Chemometrics In Photometrical Simultaneous Determination Of Multi-components Mixtures

In this paper, chemometric methods were used to assist the spetrophotometry in the simultaneous test of multi-component reactive dye mixtures with the stimulant industrial conditions.The samples of fixed multi-components were reactive red195, reactive orange122, reactive yellow145 which maximal absorbency were 540nm, 490nm, 417nm, respectively, and the spectrograms overlapped badly. Orthogonal table designed the experiments. The data obtained from spetrophotometry were be used after calculated the correlations between different wavelength points. If the correlation approached 1.0, we considered they were the reiterate informations. If the correlation approached 0.0, they were considered had no useful information. Then the data selected were processed by different methods. The average differences between the 3-component prediction results of the 2 sets of unknown samples obtained from the methods of K-matrix, principal component regression (PCR) and artificial neural networks (ANN) were 6.243%, 2.546%, 25.42%; 6.243%, 2.546%, 25.42%; 3.375%, 2.388%, 2.670%, respectively.The influence of pH values, water hardness, surfactants concentration, etc., on the test was investigated. pH values were tested if different values will interfere the determination in the range between 8.5 and 12.5, the results of test indicated that 3-component mixtures had a best stability in pH=10 and had no influence in multi-component simultaneous determination. There also have no influences in there levels designed by water hardness standard. OP and sodium dodecylbenzenesufonate, two surfactants as the textile auxiliaries were selected, results of experiments indicated the determination errors under 1%, within the error of spetrophotometry.Another part of this paper, the method established was be used in calculating the discolorations of multi-component dying wastewater after adsorbed by improved fly ashes (FA). Ascertained the best ways to improve the FA, the best adsorption time, dosage of FA and adsorption temperature, etc. through experiments. The most befitting temperature was 500℃, the ratio of Ca(OH)2/FA was 1:9. It can easily get the concentration of each component before and after adsorption in the stimulant wastewater by the FA with the method of ANN assist spetrophotometry. Discolorations can be obtained from the formula designed for calculating it. From the results of this application, this method has the significative meanings in the fields such as sorbent selection and preparation, techniques'improvement, etc.