Simultaneous Determination Of Multi-component Concentration Of Cationic Dye

In the printing and dyeing industry, it is very common to mix a variety of dyes.Ofthe most widely used ways, trichromatic dye is to match colors in color scheme.Therefore, it is crucially important to research the concentration of trichromatic dye and itsmixed dye. At present, the analysis method of the dye now just stay in offline, with noreport about on-line analysis of the concentration of the dye bath during the dyeingprocess. In this paper, on the one hand, based on fiber optic spectrometer combined withchemometrics to realize measuring multi-component dye concentration online, on theother hand, using the method of TLC combined with oblique projection.to analysis anddetermine the concentration of multi-component dye in the range of high concentration.Main research contents are as follows:(1) To analyze various factors accounting for dyeing process, such as PH, surfactant,temperature, etc. Results show that the three kinds of influence factors on the absorbanceof the dye has almost no effect. The procedure is to use visible spectropHotometer to scanspectrum data on each pure component concentration, draw the standard curve of pure dyecomponents and measurement range and detection limit. Experimental results show thatthe cationic yellow X-8GL, red X-FG, brilliant blue RL in1~10mg/L,4~40mg/L,2~20mg/L, have a good linear range. Detection limit respectively is0.0554mg/L,0.0674mg/L,0.0596mg/L.(2)The PLS method and PCR method are used for spectropHotometric analysis.Establish a simultaneous determination of cationic yellow X-8GL, cationic red X-FG,cationic bright blue RL three components of the mixture of dyes new method. Within thelinear range of each dye according to uniform design of experiment confecting blendedsample solution,26samples as a calibration set, and8samples as a test set, PLS and PCRwas carried out on the spectral data. Model was developed for the determination of mixedcationic dyes. Two models both have good robustness and precision, and can be used forthe determination of mixed cationic dyes, but PLS method is more superior to the PCRmethod.(3) To predict the concentration of the dye in the process of dyeing with the previousPLS model. Compared the results with standard curve method and double wavelengthsmethod, determine accuracy and precision of the model again. Build online determinationof dye, use PLS model to deal with spectrum data of the dye in the process of dyeing, andcan be quickly understand different stages of the situation in the dyeing process. Resultsshow that the model can well predict the concentration of cationic dyes in the process ofdyeing.(4)Combination of TLC and oblique projection theory are used for the determinationof multicomponent dyes concentration. Configuration standard solution of each purecomponent dye with multiple wavelength TLC scanning device to scan the samples,collect spectral data and transform the spectral data. Calculates the SKS value of every point, make a standard curve, determine the range of measurement of each purecomponent dye. The spectral data of each pure component dye as the spectrum data,excluding other spectrum of pure component dye as a background spectrum data,calculates the SKS value of pure component dye, then plug in standard curve, calculatesthe concentration of pure component dye. The results show that the TLC in combinationwith oblique projection method can predict concentration of cationic dyes in the process ofdyeing.