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目的了解龙岩市市售茶叶铅污染状况,并分析探讨其可能污染来源。方法 2 0 1 1~2 0 1 3年每年2次,采集龙岩市7个县(市/区)超市、茶叶店、农贸市场中的茶叶,根据GB5 0 0 9.1 2-2 0 1 0中石墨炉原子吸收分光光度法进行铅含量测定。结果采集茶叶2 1 0份,铅含量均值为0.77mg/kg,均合格,合格率1 0 0.0 0%。其中绿茶、青茶、红茶铅含量均值分别为0.85 mg/kg、0.72 mg/kg、1.0 2 mg/kg,差异无统计学意义;新罗区、漳平市、永定县、上杭县、武平县、长汀县和连城县茶叶铅含量均值分别为1.0 3 mg/kg、0.4 1 mg/kg、0.83 mg/kg、0.89mg/kg、0.72 mg/kg、1.0 9mg/kg、0.4 6mg/kg,差异具有统计学意义。结论龙岩市市售茶叶铅污染情况虽有存在但不严重,茶叶中的铅主要来源于环境中铅污染。
Objective To understand the status of lead pollution on tea in Longyan City and analyze the possible sources of pollution. Methods Twenty years from 2001 to 2011, tea leaves from supermarkets, tea shops and farmers’ markets in 7 counties (cities / districts) of Longyan were collected. According to GB5 0 0 9.1 2-2 0 1 0 graphite Determination of Lead in Furnace Atomic Absorption Spectrometry. Results Two hundred and ten tea samples were collected. The average lead content was 0.77 mg / kg, both of which passed the qualification rate of 100.0%. Among them, the average content of lead in green tea, green tea and black tea were 0.85 mg / kg, 0.72 mg / kg and 1.0 2 mg / kg, respectively. There was no significant difference in the content of lead between Xinluo, Zhangping, Yongding, Shanghang, Wuping , The average lead content of tea in Changting County and Liancheng County were 1.03 mg / kg, 0.4 1 mg / kg, 0.83 mg / kg, 0.89 mg / kg, 0.72 mg / kg, 1.09 mg / kg and 0.4 6 mg / The difference was statistically significant. Conclusion Although the lead pollution of tea sold in Longyan City exists but is not serious, the lead in tea mainly comes from the lead pollution in the environment.