This work aims to evaluate the composition of the essential oils of certain mints grown in the region of Settat Morocco and to determine their chemical compositions. The essential oils obtained by hydrodistillation have an average yield of: 2.93% for Mentha pulegium, 1.23% for Mentha piperita and 0.91% for Mentha spicata. Analyzes of oils by GC-MS, showed the presence of several components including Menthone (42.97%) and Menthol (27.64%) are the major components of Mentha piperita, piperitone (31.27%) and piperitenone (22.98%) were obtained as the major compounds of Mentha pulegium, and so the main essential oil compounds of Mentha spicata are carvone (33.14%) and trans-Carveol (20.06%).

The use of natural biopesticides, specifically essential oils, is being explored as an alternative solution to protect stored foodstuffs. This study focuses on a formulation of phosphogypsum–Pinus halepensis essential oil as a pesticidal product. First, the essential oil chemical composition was determined using gas chromatography with mass spectrometry (GC-MS), while the phosphogypsum (waste from the phosphate mining industry) was analyzed using scanning electron microscopy, X-ray fluorescence, X-ray diffraction, Fourier-transform infrared spectroscopy, and thermogravimetric–differential thermal analysis; thus, physico-chemical properties and heavy metal contents were determined. In a second step, the preparation of the formulation consists in grafting the essential oil on the phosphogypsum (adsorption) in a cylindrical geometric shape adapted to the models applied in the bioprocesses of storage. The study of essential oil transfers in the material in the case of desorption along the axis (Oz) was carried out using analytical and numerical models of the Fickian diffusion process to understand the behavior of the oil and determine physicochemical parameters such as diffusivity (D) and evaporation flux (F). By using statistical methods such as experimental design and principal component analysis, these parameters can help explain the mechanisms involved in the insecticidal activities against the primary pest of lentils (Bruchus signaticornis) and in the parameters of lentil seed germination.

Study of the Oualidia lagoon was motivated by its importance as a biological reserve and its economic interest based on the exploitation of high-value resources (oysters). This lagoon is a RAMSAR wintering and stopover site for many migratory birds between Africa and Europe.

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