One of the most important indicators for land degradation is the progressive salinization of soils. This work, conducted at the Dawling National Park (southern Mauritania), assess the effects of salinity on soil quality. Analyzes of spatial variation in salinity were performed using interpolation and spatial analysis (GIS) methods. Thus, maps of electrical conductivity have been developed using several methods of interpolation and spatial analysis: Inverse Weighting (IDW), Local Polynomial Interpolation (LPI), Radial Base Function (RBF) and Ordinary Kriging (OK). The obtained results showed that the best estimator is IDW method, which provides a good ability to predict electrical conductivity, with a mean squared error (RMSE) of 0.34 mS/cm and a correlation coefficient (R) of 0.99.
This work presents an assessment of marine pollution due to heavy metals accumulated in surface sediments collected from the Lévrier bay coastline in NW Atlantic, Mauritania. The samples were subjected to HCl and HNO3 digestion, and an atomic absorption spectrophotometer was used to determine the concentrations of all metals (Cd, Pb, Cu and Zn) with the exception of Hg that was analysed by DMA-80 Direct Mercury Analyzer. The ranking of the metals at all studied sites was Al>Zn > Cu >Pb> Cd>Hg, and all the sediments samples displayed lower concentrations than the calculated worldwide mean of unpolluted sediments. The data were classified according to seasons.. Eight common pollution indices (i.e. EF, Igeo, QoC(%), CF, SPI, PLI, Cd and PERI)were applied to ascertain the sediment quality. The enrichment (EF) factor resulting from Pb, Cu and Zn were <1 in surface sediments at all sampling sites and for Cd at Cap Blanc, indicating no enrichement. EF values in COMECA and Baie de l'Etoile for Cd were 1 < EF < 3, indicating a low enrichment. EF values for Cd at IMROP were 3 < EF < 5 indicated a moderate enrichment. The value of the geoaccumulation (Igeo) factor from all metals analysed was less than 0 in all sampling sites, which classified the sediments as uncontaminated.The value of contamination (CF) factor for all elements analyzed was lower than 1 across all sampling sites, implying a low contamination.The values of Sediment Pollution (SPI) Index were 0
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