【正文】 蘇州科技學(xué)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(cè) 摘 要 近年來(lái)，茶葉的質(zhì)量和安全備受關(guān)注，而茶葉中的鉛銅含量直接關(guān)乎飲用者的身體健康。 本文使用火焰原子吸收光譜測(cè)定了鐵觀音、西湖龍井、碧螺春、黃山毛峰、祁門(mén)祁紅、信陽(yáng)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(shí)驗(yàn)條件，最后對(duì)這兩種方法進(jìn)行了比較。 實(shí)驗(yàn)結(jié)果表明：所選擇的 8 種茶葉中鉛、銅的含量都沒(méi)有超出國(guó)家限值，都可以放心使用，并比較得出酸法消解能更準(zhǔn)確的測(cè)定茶葉中鉛、銅的 含量。 關(guān)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(xué)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(xué)院本科生畢業(yè)論文 III 目 錄 1 緒論 ......................................................................................................................... 1 鉛、銅的測(cè)定 意義 ................................................................................................ 1 鉛、銅的簡(jiǎn)介 ..................................................................................................... 1 鉛、銅對(duì)人體的影響 ......................................................................................... 2 研究背景 ................................................................................................................ 4 相關(guān)標(biāo)準(zhǔn) ............................................................................................................. 4 各種測(cè)定方法 ..................................................................................................... 4 研究目的 ................................................................................................................ 5 2 實(shí)驗(yàn)部分 ................................................................................................................. 6 儀器和試劑 ............................................................................................................ 6 儀器 ..................................................................................................................... 6 試 劑 ..................................................................................................................... 6 實(shí)驗(yàn)內(nèi)容和方法 .................................................................................................... 6 樣品 ..................................................................................................................... 6 標(biāo)準(zhǔn)曲線 ............................................................................................................. 7 實(shí)驗(yàn)方法 ............................................................................................................. 7 加標(biāo)回收率 [8] ...................................................................................................... 8 3 結(jié)果與討論 ............................................................................................................. 9 實(shí)驗(yàn)結(jié)果 ................................................................................................................ 9 最佳實(shí)驗(yàn)條件確定 ............................................................................................. 9 標(biāo)準(zhǔn)曲線 ........................................................................................................... 11 樣品測(cè)定結(jié)果 ...................................................................................................... 11 酸法消解 ........................................................................................................... 11 沸水溶出法 ....................................................................................................... 12 加標(biāo)回收率 .......................................................................................................... 13 酸法消解測(cè)銅的加標(biāo)回收率 ........................................................................... 13 酸法消解測(cè)鉛的加標(biāo)回收率 ........................................................................... 13 沸水溶出法測(cè)定銅的加標(biāo)回收率 ................................................................... 14 蘇州科技學(xué)院本科生畢業(yè)論文 IV 沸水溶出法測(cè)定鉛的加標(biāo)回收率 ................................................................... 14 方法優(yōu)越性比較 .................................................................................................. 15 兩種方法測(cè)銅優(yōu)越性比較 ............................................................................... 15 兩種方法測(cè)鉛優(yōu)越性比較 ............................................................................... 15 兩種方法相關(guān)性 .................................................................................................. 16 兩種方法測(cè)銅的相關(guān)性 ................................................................................... 16 兩種方法測(cè)鉛的相關(guān)性 ................................................................................... 16 結(jié) 論 ............