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《Journal of Safety and Environment》 2006-01
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Effects of soil acidification by tea plantation on fluoride and discussion of safety level of teafluoride

ZONG Liang-gang, LU Li-jun, LUO Min, TANG Yong-hua(College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China)  
Based on the analysis of the tea plantation soil acidification in China and other countries, this paper has summarized the latest research progress of the relation between the soil water-soluble fluorine and soil pH. Moreover, our field investigations and simulated experiments have given explanations on how soil acidification affect the soil water-soluble fluorine. Needless to say, as one of the essential microelements for human body, fluorine influences man's health. So far, quite a few studies indicate that tea drinking may lead to fluorosis and other diseases. Over intake of high fluoride from tea drinking may lead to dental fluorosis and even skeleton deformities. Among the above said detriments, soil fluoride can be a primary cause, which is actually the chief factor affecting absorbable fluoride (water-soluble fluorine) for tea plants. Our investigations prove that the content of soil water-soluble fluorine does not rely on soil pH. On the contrary, it proves that soil water-soluble fluorine would change in the soil indiscriminately when the soil pH decreased above 4.00. However, when soil pH is below 4.00, the content of soil water-soluble fluorine would increase significantly with the decrease of soil pH. Thus, our study reveals that it depends on the soil pH significantly. Hence we suggest that it is essential to control the soil acidification in tea plantation. At the same time, it is necessary to study the standards of fluorine daily maximal allowance for average person made in different countries. The results of tea dissolving experiments indicate that the standard of the tea fluorine content in our country is not strict enough in comparison with those in other countries. In hoping to produce tea with less fluoride, and advance the applicability of our national tea production standards and international trade regulations, the present article provides valuable scientific evidence for the experts concerned to refer to.
【Fund】: 江苏省科技厅攻关项目(BE2002315)
【CateGory Index】: S571.1
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