| With increased awareness of quality and safety of tea, excessive fluoride content intea is increasingly attracted attention. Correct understanding of fluoride in tea is realisticand urgent issue.489tea samples in China’s major tea-producing provinces and additional40foreign brands of tea were collected, and analyzed the soluble fluoride content securityrisks in China’s commercial tea.Tea plantation soil, tender leaves and mature leavessamples were got from Lujiang, Yuexi, Keemun, Jinzhai, langxi, Jing County, Dongzhi,Hefei. Fluorine content of the soil, the form of fluoride in soil, fluorine enrichment in teaplants as well as different varieties of tea fluoride accumulation characteristics wereanalysed.1Survey of soluble fluoride content of commercially available tea and healthsafety risk assessmentFluoride content and frequency distribution characteristics in tea products and therelationship between safe intake and the above-mentioned were analyzed on the basis ofdetecting529tea samples. The content of fluoride in tea products were8.5~965mg/kg,average value was108.78mg/kg.Dark tea> Oolong Tea>black tea>greentea>white tea. Dark tea Oolong tea black tea green tea white tea drinking people’ s dailyintake were2.50mg,1.75mg,1.06mg,0.69mg,0.60mg. Accroding to Chinese dailylimit intake of fluoride,for most tea drinking people, it does not exist health risk bydrinking tea, but at an extreme situation such as heavy drinking tea that what have a highcontent of fluoride for a long time, drinking tea would bring about several health risk.Conduct quantitative risk assessment to evaluate the risk level of fluoride by means oftea products’ consumption. Hazard quotient was employed to characterize the risk offluoride via drinking tea products with the application of Crystal Ball software basing onMonte Carlo simulation. The results showed that the average of the hazard quotient ofgeneral population through tea products consuming was less than1, but more than1at95percentile. It shows that to the general population the exposure of fluoride only by teaproducts’ consumption was likely to bring about certain health risk. Further analysis showsthat at high level of exposure the upward trend of hazard quotient of green tea and blacktea were unobvious, but the hazard quotient of dark tea raised rapidly. That indicated thatthe exposure of fluoride does not bring about health risk to the green tea and black teadrinking people, but certain health risk to the dark tea drinking people. So the control and monitoring of fluoride in tea products should be strengthened to further reduce the fluoriderisk level of the general population.2Anhui tea plantations Soil-Tea system fluoride enrichment characteristicsDifferent F chemical forms content and distribution in Anhui tea plantations soil wasanalysed.It showed that Anhui tea plantations soil total fluoride content ranged from191.4~1138.0mg/kg, the average content was405.3mg/kg. Residual fluoride was themain chemical form of soil fluoride, which was nearly95%. Res-F (386.8mg/kg)>Ex-F(8.61mg/kg)>Fe/Mn-F(5.34mg/kg)>Ws-F(2.06mg/kg)>O.M.F(1.51mg/kg).T-F and Res-Fcorrelation coefficient even close to1,with a very significant correlation.The content ofwater soluble fluoride in tender leaves is52.13mg/kg~264.2mg/kg,and total fluoride is70.06mg/kg~350.5mg/kg.Most of the sample is less than the Ministry of Agriculture teafluoride safety limits (200mg/kg).The content of water soluble fluoride in mature leavesis151.6mg/kg~2093mg/kg, and total fluoride is365.6mg/kg~2476mg/kg.The content offluoride in mature leaves were significantly higher than in tender leaves.The fluorideenrichment factor of mature leaves is0.13to0.95, and mature leaves is1.03to8.56. Totalsoil fluoride has strongest direct effect on the content of water fluoride and total fluoride intender leaves，Fe/Mn-F has strongest direct effect on the content of water fluoride and totalfluoride in mature leaves. |
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