Experimental Study on Sorption and Desorption of NaCl to Sand Using a Physical Model

In many parts of our planet, salinity has caused numerous problems in the production of goods, especially in arid and semi-arid areas, which account for one third of the planet's surface area. The main purpose of this article is to investigate the NaCl’s adsorption to and desorption from saturated porous media of sand. The NaCl solutions with the concentrations of 2.5, 5 and 10 g/l, and three types of soil textures with the weights of 50, 100 and 200g were used as samples of the experiments. The samples were placed in capped containers. The salinity of the solutions was measured using an EC-metre at 1, 2, 4, 7 and 24 hours from the beginning of the experiment. The results indicated that in the soils with less weight, the adsorption of sodium ions were more, and as soil weight increased, the adsorption of ions decreased, and finally the adsorption phenomenon was departed. Over time, the process of adsorption and desalination eventually stopped.