頁籤選單縮合
題名 | Study on Separation/enrichment and Determination of Mercury(II) Using Microcrystalline Thymolphthalein Loaded with Ternary Association Complex |
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作 者 | 涂常青; 溫欣榮; | 書刊名 | Journal of the Chinese Chemical Society |
卷期 | 57:1 2010.02[民99.02] |
頁次 | 頁93-98 |
分類號 | 346 |
關鍵詞 | Hg II; Separation/enrichment; Determination; Microcrystalline thymolphthalein; Potassium iodide; Dodecyl trimethyl ammonium bromide; |
語文 | 英文(English) |
英文摘要 | The paper presents a novel method for the separation/enrichment of Hg(superscript 2+) using microcrystalline thymolphthalein loaded with ternary association complex prior to the determination by spectrophotometry. The effects of different parameters, such as the dosages of KI and dodecyl trimethyl ammonium bromide (DTAB) and thymolphthalein, various salts and acidity etc. on the enrichment yield of Hg(superscript 2+) have been investigated to select the experimental conditions. The results showed that in the presence of 1.0 g NaCl, when the dosage of 0.1 M KI solution was 1.50 mL and 5.0×10^(-3) M dodecyl trimethyl ammonium bromide (DTAB) solution was 1.50 mL respectively, the water-insoluble ternary association complex of (DTAB)2(HgI4) which produced by Hg(superscript 2+) and I(superscript -), DTAB cation (DTAB(superscript +)) was quantificationally absorbed on the surface of microcrystalline thymolphthalein Therefore, Hg(superscript 2+) was separated completely from Zn(superscript 2+), Mn(superscript 2+), Ni(superscript 2+), Co(superscript 2+), Fe(superscript 3+), Al(superscript 3+), Pb(superscript 2+), Bi(superscript 3+) and Cr(superscript 3+) etc. by contolling acidity. The possible enrichmentmechanism of Hg(superscript 2+) was deduced. The proposed method has been successfully applied to the determination of Hg(superscript 2+) in the sample of industrial waster water, and the results agreed well with the dithizone method. The recoveries were 94.5%~106.5%, and the RSD was 2.0%~2.8%. |
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