Abstract

Simultaneous Determination Of Linear Alkyl Benzene Sulfonate And Coconut Fatty Acid Diethanol Amide In Liquid Detergent By UV-Vis Spectroscopy And Partial Least Squares

Author(s): Atena Adnani, Mahmoud Reza Sohrabi, Arezoo Hassan Nouri, Hamid Reza Fard Masoumi

The method aims, simultaneous determination of linear alkyl benzene sulfonate(LABS) and coconut fatty acid diethanol amid(Coconut) in liquid detergent by UV-vis spectroscopy. The absorbance spectra of these compounds are strongly over lapped which doesn’t permit their direct determination. The propose method is based on using partial least squares (PLS)model for resolving highly overlapping signals obtained from mixture of them. Inputs of model were taken from absorbance spectral data which recorded in wavelength region 200-600 nm. In other steps, first and second order derivative spectra were considered as inputs of model. The proposed method has provided upper precise and accuracy. The experimental calibration was designed with 16 standard samples the concentrations were varied between 0.0010-0.0025 g/ml for LABS and 0.0025- 0.0040 g/ml for coconut. The statistical parameters such as square correlation of coefficient(R2), root mean square error cross-validation (RMSECV) have been evaluated and number of factors and spectral region have been optimized.The optimized model applied to the determination of these components liquid detergent. The results for LABS in zero and first order derivative spectra and coconut in zero, first and second order derivative spectra were satisfied. The error obtained for LABS and coconut in this method 2.86% and 2.50% respectively.