Herein, the potential use of solid residues produced by the steam-distillation of medicinal aromatic plants as promising and unexploited bioactive matrices is limited. Thus, the aim of the present study was to optimise and validate a simple, reproducible, and sensitive LC-DAD-ESI-MS method for the simultaneous determination of 44 phenolic compounds in solid residues from the essential oil industry. These compounds were distributed in five major categories, namely, hydroxcinamic acid derivatives (10 compounds), hydroxbenzoic acid derivatives (6 compounds), flavonoids (25 compounds), phenolic terpen (carnosal and carnostic acid), and chalcones (arbutin). The phenolic compounds were separated on a Poroshell 120 EC-C\({}_{18}\) (4.6 \(\times\) 150 mm, 4 \(\mu\)m), thermostated at 35 \({}^{\circ}\)C, using a linear gradient elution system consisting of 0.1% (\(v/v\)) formic acid in water and acetonitrile, with a flow rate of 0.5 mL/min. Identification of the phenolic compounds was carried out by comparing retention times, UV, and mass spectra with those of authentic standards. An analytical method validation procedure was conducted comprising linearity, inter-day, and intra-day precision (repeatability), and detection and quantification limits (LOD/LOQ). The validation data showed good linearity (R\({}^{2}>\) 0.992), precision (RSD \(<\) 15%), LOD (0.018-1.483 \(\mu\)g/mL), and LOQ (0.054-4.494 \(\mu\)g/mL), and short chromatographic run (\(<\)35 min). Finally, the method was applied to oregano (_Origanum vulgare_ subsp. _hirtum_), rosemary (_Rosmarinus officinalis_ L.), and sage (_Salvia fruticosa_ Mill. ), before and after essential oil distillation, and more than 20 phenolic compounds were quantified in all the samples analyzed. The major phenolic compound found in oregano, rosemary, and sage extracts were rosmarinic acid, while carnosal and carnostic acid were quantified in both rosemary and sage extracts in a considerable amount. As a result, it was confirmed that the proposed method was highly reliable for the determination of the phenolic species in aromatic plants extracts. ## References  
* Saha and Basak (2020) Saha, A.; Basak, B.B. Scope of value addition and utilization of residual biomass from medicinal and aromatic plants. _Ind. Crop. Prod._**2020**, _145_, 111979-111995. * Celeno et al. (2017) Celeno, R.; Piccinelli, A.L. ; Pegano, I.; Roscigno, G.; Campone, L.; de Falco, E.; Russo, M.; Rasrelli, L. Oil distillation wastewaters from aromatic herbs as new natural source of antioxidant compounds. _Food Res. Int._**2017**, _99_, 298-307. * _16.10. The Potential of Biopartitioning Micalr Chromotagraphy to Predict the Soil Sorption of Pesticide Compounds_
* **C. Stergiopoulos *, F. Tsopelas and M. Ochsenkuhn-Petropoulou**
* Laboratory of Inorganic and Analytical Chemistry, School of Chemical Engineering, National Technical University of Athens, 10431 Athens, Greece
* * Correspondence: chrisxp3@hotmail.com  
Modern agricultural practices use a huge amount of pesticides to control unwanted pests. Many such agrochemicals persist in the soil and plant systems for long time and pose a risk of migration into drinking water sources and food chains [1]. The mobility, fate, and transformation of agrochemicals depend largely on the soil organic matter content and the hydrophobicity of compounds [2]. Chromatographyposesa is a powerful technique for the measurement of physicochemical parameters of organic compounds [3]. Chromatographic retention has proven to be a good surrogate to hydrophobicity measurements due to the higher accuracy and easier experimental performance [4]. The potential of Biopartitioning Micalr Chromotagraphy (BMC) to predict the soil sorption of pesticides was investigated in this work. For this purpose, the retention of 39 structurally diverse pesticides was determined on a Discovery RP-18 column using micellar mobile phases consisted of polyoxyethylene(23) lauryl ether (Brij35), sodium dodecyl sulfate (SDS), and cetrimonium bromide (CTAB) surfactants above critical micelle concentrations.