Method validation and recovery study of linear alkyl benzene sulfonate using adsorbent from labsa waste

LABS is a highly used anionic surfactant in cleaning products. With the increase of waste, which is one of the factors brought by the developments in the industry and increasing population density, chemical wastes are also increasing. For these reasons, the follow-up-determination and purification of the LABS component increase its importance. The LABS amount was determined by using HPLC-DAD, UV-Vis and titration. In the study, preconcentration was performed using different adsorbents (activated carbon, resin, silica gel and XAD-7) for LABS recovery and optimum conditions were determined by evaluating the results obtained with UV-vis and HPLC. In the preconcentration process were evaluated parameters such as pH, amount of adsorbent, extraction time, sample solution volume. Optimum conditions obtained from method validation by HPLC were flow rate of 0.7 mL/min, wavelength of 210 nm, injection volume of 20 μL and column temperature of 25 °C. The optimum extraction time for LABS was determined as 30 min at pH 7, and recovery (%) from 90 with UV to more than 95 with HPLC was achieved. LOD and LOQ values were found to be 0.14 ppm and 0.48 ppm, respectively, and the %RSD value was less than 10. As a result, an adsorption study was carried out for the recovery of the LABS component produced in the factories and seen as waste, and the waste LABS was recovered as a product. Successful results were obtained in the recovery with activated carbon from the adsorbents used. Keywords: LABS, Adsorbent, Waste, Pre-concentration.