DW Spectrophotometric Determination of Sodium Dodecylsulfonate in Landfill Leachate with the Reagent Victoria Blue B

In a B-R buffer solution of pH 7.3,a blue colored ionic association complex,with mole ratio of 2 to 1 was formed by the reaction of sodium dodecylsulfonate (SDS) with victoria blue B (VBB),having the positive absorption maxmum at the wavelength of 690 nm and negative absorption maximum at 615 nm.Ranges of linearity and values of apparent molar absorptivity found in the positive absorption region and in the negative absorption region were 0.2-8.2 mg·L-1,0.2-6.8 mg·L-1 of SDS,and 3.48×104L·mol-1·cm-1,2.14×104L·mol-1·cm-1 respectively.By applying the method dealwavelength measurement taking the wavelength pair at the two absorption maxima,the value of apparent molar absorptivity of 5.60×104L·mol-1·cm-1 was achieved.Based on these facts,a method of DW-spectrophotometric determination of SDS in landfill leachate was proposed.Conditions for the color reaction was studied and optimized.Method for treatment of sample was described.Three landfill leachate samples were analyzed by this method,giving values of recovery and RSD′s (n=5) in the ranges of 98.5%-101.0% and 0.8%-1.5% respectively.