I was discussed in the Department of Chemistry at the Faculty of Education at the University of Aden today, Thursday, February 27, 2025 AD.

At the beginning of the scientific discussion, the researcher reviewed a summary of his thesis, through which he touched on the scientific methodology that he followed in preparing the thesis, and to its structure of classes and research, as well as the recommendations and conclusions that came out of his studies, in addition to the difficulties he faced during the research process and the study of the case.

The Discussion and Governance Committee headed by Prof. Dr. Shaif Muhammad Qasim Saleh, Chairman of the Committee, approved a scientific supervisor, and the membership of Professor Dr. Khaled Awad Al -Rabaki is an external discussion from the University of Hadramout, and Professor Associate Dr./ Mohamed Muthanna Taher, an internal discussion, accepting the thesis and granting the researcher/ Radwan Muhammad Saleh Nasser the degree of PhD in chemistry, appreciating the great efforts he made in his scientific thesis And its results, which call for work and take into account by the relevant bodies, describing the message as an awareness scientific message, which will benefit from the bodies, researchers and university libraries.

The study problem is highlighted to assess the validity of the water used for drinking in the Al -Masimir district of Lahj Governorate through the investigation and analysis of the samples of this water, in addition to the appearance of fluorine poisoning in the teeth and osteoporosis in children, by focusing on fluorine removal systems using the limestone crushed and phosphoric acid specifically for drinking water applications, and aimed at investigating the concentration of fluoride and some physical properties in drinking water in The study area and its comparison with the standards of the World Health Organization (WHO), by collecting seventeen samples of drinking water from surface water. 

The scientific study came out with many results, most notably that the concentration of fluoride in most of the studied samples exceeded the permissible limit for the World Health Organization, and the study recommended that government institutions and organizations study soil and rocks, in addition to knowing the reasons for increasing fluoride concentration in the water.