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題 名 | 海水中微量金屬元素濃縮問題的探討(第二部份):以Chelex-100鉗合樹脂-石墨爐原子吸收光譜法測定海水中溶解性鎘銅鎳鋅鈷元素=Study on the Pre-Concentration Column for the Determination of Trace Metals in Seawater(Part 2): Application of Chelex-100 Column and Graphite Furnace Atomic Absorption Spectrometry on the Determination of Dissolved Cd, Cu, Ni, Zn and Co in Seawater |
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作 者 | 鍾仕偉; 白書禎; 陳秋妏; 董正釱; 歐錫祺; | 書刊名 | 化學 |
卷 期 | 55:1 1997.03[民86.03] |
頁 次 | 頁29-36 |
分類號 | 351.93 |
關鍵詞 | 重金屬; 預濃縮; Chelex-100鉗合樹脂; 原子吸收光譜法; Trace metals; Pre-concentration; Chelex-100 chelating ion-exchange resin; Atomic absorption; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究乃針對海水中微量金屬元素的濃縮與測定方法作一探討。利用鉗合樹脂濃 縮法濃縮海水中的微量金屬元素,如鎘、銅、鎳、鋅與鈷。同時以原子吸收光譜儀測定之。 在作法上, 外洋海水採樣後 (體積 1250 毫升 ) 以小於 4mL/min 之流速通過一 Chelex-100 濃縮裝置,最後以 10 毫升 2N 的硝酸回收之,如此則達到濃縮 125 倍的目的 ,此濃縮倍數可以有效的測定海水中的鎘、銅、鎳與鋅元素。但對於超低濃度的鈷元素則需 將 2N 硝酸沖堤液於燒杯中烘乾而後以稀硝酸再溶解以達到二次濃縮的目的,最後則是在原 子吸收光譜儀之石墨管上連續注入測定之。 實驗結果,添加 0.1-1 ppb 的四種微量金屬元 素於空白海水中, 濃縮後所得之回收率介於 97-105 %之間,而添加 1.6-3.1 ppt 的鈷元 素於海水中再經過三階段的濃縮步驟所得之回收率介於 99-104 %。 以 CASS-1, NASS-2 與 NASS-4 標準海水測試之結果,皆得到令人滿意之結果。 |
英文摘要 | The experimental conditions of operating the Chelex-100 column for the pre-concentration of trace amounts of Cd, Cu, Ni, Zn, and Co in natural seawater have been optimized by a proposed exponental model. Seawater (1.25L) were allowed to pass through the Chelex-100 column at a flow rate of no more than 4 mL/min and the metals were recovered by eluting with nitric acid. The concentration factor obtained was 125 folds, which provided enough sensitivity for detecting Cd, Cu, Ni and Zn at their natural levels (0.1-1 ppb) using graphite furnace atomic absorption spectrometry. Good recoveries (97-105%) were found for those four elements. However, for Co analysis (natural concentration range 1-7 ppt) a second evaporation step was continued to further reduce the volume of the column concentrate from 10 mL to 2 mL. The final yield was deposited repetitively onto the graphite tube in order to enhence the sensitivity. With these modifications the concentration of Co in seawater was determined even the concentration was as low as 0.001-0.003 ppb. The method was checked by measuring CASS-1, NASS-2, and NASS-4 certified reference seawaters and the results were satisfactory. |
本系統中英文摘要資訊取自各篇刊載內容。