Transference And Transform Of Fluoride And Aluminum In The System Of Soil-tea Plants-tea Liquor And Probing Into The Prevention From Brick-tea Fluorosis

It was in the 1980s when the brick-tea fluorosis was first discovered among the Tibetan minority nationality in Sichuan province of China. From then on, such type of fluorosis has been found among other ethnical groups, such as the Mongolian, Kazakh minority nationalities besides the Tibetan one, living mainly in the west or northwest of China. Nowadays some results have been achieved in the epidemiological investigation. The main reason causing such type of fluorosis was the high fluoride content in the brick tea. Today , the high aluminum content in the brick tea begins to be emphasized.In this thesis, fluoride and aluminum were combined and studied in the system of the soil of tea plantation—tea plant—tea infusion for the first time. According to such research, some clues were to be given to understand the mechanism of tea plant's accumulating fluoride and aluminum. Meanwhile, some methods were going to be obtained to break through the prevention from the brick-tea fluorosis.The fluoride content in the brick tea is much higher than other ordinary tea products. So, it is indispensable to determine the fluoride content in the brick tea well and truly, which is necessary to evaluate accurately the harmness caused by the brick-tea fluorosis. Some experiments were carried out to study the factors affecting the dissolving characteristic of the fluoride from the brick tea.By means of such series of research, some results were gained as follows:1. Some physical and chemical properties in the soil of tea plantation have changed because of the growing of tea plants. pH in the soil of tea plantation is a little lower than that outside the tea plantation; organic matters, exchangeable...