氫化物發生—原子熒光光譜法測定調味料中的鉛

食品科學論文編號:SP098  論文字數:7012,頁數:16

目  錄
中文摘要 I
英文摘要 II
目錄 III
1. 緒論 1
 1.1 前言..1
1.2 氫化物發生-原子熒光光譜法(HG-AFS)測鉛的研究...1
1.2.1 鉛烷的形成..1  1.2.2 增感劑..2
      1.2.3 共存元素干擾3
 1.2.4 氫化物發生-原子熒光光譜法(HG-AFS)測食品中鉛的應用...3
2. 實驗部分 4
 2.1 實驗原理..4
 2.2 實驗儀器和試劑4
 2.2.1 實驗儀器4
2.2.2 實驗試劑4
2.3 儀器工作條件..4
 2.4 實驗方法. 5
3. 實驗結果與討論 5
 3.1 消化法的選擇以及消解液介質的選擇. 5
 3.2 反應介質的選擇... 6
 3.3 酸度實驗. 6
 3.3.1 載流的酸度實驗. 6
 3.3.2 鉛溶液中的酸度實驗. 7
 3.4 鐵氰化鉀的濃度實驗... 7
 
 3.5 還原劑的濃度實驗. 8
3.5.1 NaBH4濃度...8
3.5.2 NaOH濃度實驗9
 3.6 硝酸對鉛熒光強度的影響...10
 3.7 標準曲線線性關系及檢出限 11
 3.8 準確度和精密度實驗...11
 3.9 回收率實驗...11
 3.10 樣品分析12
4. 總結與展望... 13
致謝 14
參考文獻 15

摘 要：本文采用氫化物發生—原子熒光光譜法測定調味料中的鉛含量，通過實驗考察了載流的酸度，溶液的酸度，鐵氰化鉀的濃度，還原劑的濃度對鉛熒光強度的不同影響，得出最佳實驗條件。并在最佳實驗條件下對進行回收率、精密度、準確度實驗和樣品分析，得出該方法的檢出限為0.0031μg/L，標準曲線相關系數：0.9921，相對標準偏差小于10 %，回收率為81.7%～88.0%，采用氫化物發生—原子熒光光譜法測定調味料中的鉛含量標準曲線的相關系數好, 靈敏度高, 結果準確、可靠, 且分析成本低廉, 操作簡單，前景廣闊。

關鍵詞：氫化物；原子熒光光譜法；鉛

Abstract:  In this dissertation , the lead content was determinned hydride atomic fluorescence spectrometry .,we explored the  Pb fluorescence intensity influential factors such as currentcarrying acidity , acidity of solution , concerntration of red potassium prussiate,concerntration of reducer , and proposed the optimal experiment condition .Then recovery ,precision accuracy experiments have been investigated , also the sample have been analyzed under the optimal experiment condition , the detection limit is 0.0031μg/L , the correlation coefficient is 0.9921 , standard deviation is less than 10% , the coefficient of recovery is between 81.7%—88.0% . Hydride atomic fluorescence spectrometry has some advantages when determined the lead content such as good correlation coefficient , high sensitivity , exact result , low cost and easily to handle , also it is wide prospect.