Changes in the chemical composition of soils during the development of gas fields in the south-west of the Аral seaMurat B. Jollibekov, Bibigul S. Tleumuratova and Elzura P. UrazymbetovaE3S Web Conf., 449 (2023) 06002DOI: https://doi.org/10.1051/e3sconf/202344906002