Shu W S, Zhang Z Q, Lan C Y, Wong M H
State Key Laboratory for Bio-control, School of Life Sciences, Zhongshan University, Guangzhou 510275, People's Republic of China.
Chemosphere. 2003 Sep;52(9):1475-82. doi: 10.1016/S0045-6535(03)00485-5.
Some Tibetans in Sichuan Province in southwestern China have been suffering from fluorosis, due to drinking and eating tea with high fluoride (F) and aluminium (Al) contents. Tea plants, soils of tea plantations and tea products from Yaan, Gaoxian and Yibin Cities in Sichuan Province were investigated to evaluate the factors affecting F and Al contents in tea products. The F and Al concentrations of four commercial brands of brick teas were significantly higher than those of 11 brands of green teas. Chemical analysis indicated that total and available F and Al concentrations in tea plantation soils in Yaan and Gaoxian were within the normal range compared with acid soils in South China and tea soils in Fujian Province. Edaphic conditions did not contribute to the high F and Al concentrations in brick tea. Analysis of raw materials of brick tea indicated that old leaves were the major contributors to the high F and Al contents contained in brick tea. There were also great variations among different tea varieties in accumulating F and Al, and concentrations of F and Al in tea variety of Qianmei 303 were about 2-3-fold higher than the other three varieties. Selection of appropriate varieties would be important to lower F and Al contents in tea products.
中国西南部四川省的一些藏族人一直饱受氟中毒之苦，原因是饮用和食用了氟（F）和铝（Al）含量高的茶。对四川省雅安市、高县和宜宾市的茶树、茶园土壤及茶叶产品进行了调查，以评估影响茶叶产品中氟和铝含量的因素。四个商业品牌砖茶的氟和铝浓度显著高于11个绿茶品牌。化学分析表明，与中国南方的酸性土壤和福建省的茶园土壤相比，雅安和高县茶园土壤中的总氟、有效氟和总铝、有效铝浓度均在正常范围内。土壤条件并非造成砖茶中氟和铝浓度高的原因。对砖茶原料的分析表明，老叶是砖茶中氟和铝含量高的主要来源。不同茶品种在氟和铝的积累上也存在很大差异，黔湄303茶品种中的氟和铝浓度比其他三个品种高出约2至3倍。选择合适的品种对于降低茶叶产品中的氟和铝含量至关重要。
