【正文】 蘇州科技學院本科生畢業(yè)論文 I 畢業(yè)論文： 茶葉及其提取液中重金屬 Cu、 Pb 的檢測 摘 要 近年來，茶葉的質量和安全備受關注，而茶葉中的鉛銅含量直接關乎飲用者的身體健康。 本文使用火焰原子吸收光譜測定了鐵觀音、西湖龍井、碧螺春、黃山毛峰、祁門祁紅、信陽毛尖、福建白茶、云南普洱等 8 種茶葉中的 Cu 和 Pb 的含量。分別采用酸加熱消解和沸水浸泡溶出法處理茶葉樣品，確定了兩種方法的最佳實驗條件，最后對這兩種方法進行了比較。 實驗結果表明：所選擇的 8 種茶葉中鉛、銅的含量都沒有超出國家限值，都可以放心使用，并比較得出酸法消解能更準確的測定茶葉中鉛、銅的 含量。 關鍵詞 火焰原子吸收光譜；茶葉；酸法消解；沸水溶出 蘇州科技學院本科生畢業(yè)論文 II Determination of Pb and Cu in teas and its extract Abstract The quality and safety of teas bees an important concern of Chinese in recent years. And the contents of Cu and Pb have a directly effect on people’ health. The concentrations of Cu and Pb by Flame atomic absorption spectrometry from eight Chinese teas, that is， Oolong tea, West Lake Longjing, Spring snail, Mount Huangshan Mao Feng, Qimen black tea, Xinyang Maojian tea, Fujian white tea and Yunnan Pu39。er. are determined in this thesis. Tea samples are pretreated with acid digestion method and boiled water immersion and extraction method. The optimal pretreatment conditions are selected and the results between mentioned two methods are pared. Our experiments indicates that the concentrations of Cu and Pb from selected tea samples are all below the maximum values of national tea standards and thus safety to be used. Moreover, results from acid digestion are better than those from boiled water extraction. Keywords Flame atomic absorption spectrometry, Tea, Acid degistion , boiled water immersion 蘇州科技學院本科生畢業(yè)論文 III 目 錄 1 緒論 ......................................................................................................................... 1 鉛、銅的測定 意義 ................................................................................................ 1 鉛、銅的簡介 ..................................................................................................... 1 鉛、銅對人體的影響 ......................................................................................... 2 研究背景 ................................................................................................................ 4 相關標準 ............................................................................................................. 4 各種測定方法 ..................................................................................................... 4 研究目的 ................................................................................................................ 5 2 實驗部分 ................................................................................................................. 6 儀器和試劑 ............................................................................................................ 6 儀器 ..................................................................................................................... 6 試 劑 ..................................................................................................................... 6 實驗內容和方法 .................................................................................................... 6 樣品 ..................................................................................................................... 6 標準曲線 ............................................................................................................. 7 實驗方法 ............................................................................................................. 7 加標回收率 [8] ...................................................................................................... 8 3 結果與討論 ............................................................................................................. 9 實驗結果 ................................................................................................................ 9 最佳實驗條件確定 ............................................................................................. 9 標準曲線 ........................................................................................................... 11 樣品測定結果 ...................................................................................................... 11 酸法消解 ........................................................................................................... 11 沸水溶出法 ....................................................................................................... 12 加標回收率 .......................................................................................................... 13 酸法消解測銅的加標回收率 ........................................................................... 13 酸法消解測鉛的加標回收率 ........................................................................... 13 沸水溶出法測定銅的加標回收率 ................................................................... 14 蘇州科技學院本科生畢業(yè)論文 IV 沸水溶出法測定鉛的加標回收率 ................................................................... 14 方法優(yōu)越性比較 .................................................................................................. 15 兩種方法測銅優(yōu)越性比較 ............................................................................... 15 兩種方法測鉛優(yōu)越性比較 ............................................................................... 15 兩種方法相關性 .................................................................................................. 16 兩種方法測銅的相關性 ................................................................................... 16 兩種方法測鉛的相關性 ................................................................................... 16 結 論 ............