篇名 | Measurement of Total Mercury in Sedments by Graphite-Furnace Atomic Absorption Spectrophotometry Using 2,3- Dimercaptopropane-1-sulfonate as a Complexing Agent |
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卷期 | 11 |
並列篇名 | 以DMPS作為複合劑及使用石墨式原子吸光法測定底泥中總汞的含量 |
作者 | 徐明德 、 楊盛仁 、 鄭翰鈞 、 沈堯堅 、 林芳儀 、 翁崇賢 、 王博彥 、 陳寬孺 、 郭茂 |
頁次 | 015-037 |
關鍵字 | 底泥 、 總汞 、 DMPS 、 石墨式原子吸光法 、 sediment 、 total mercury 、 DMPS 、 graphite-furnace atomic absorption spectrophotometry 、 TSCI |
出刊日期 | 200907 |
An amount (50 mg) of dried sediment sample was digested with a mixture of aqua regia (700 μL) and hydrofluoric acid (50 μL) at 80°C for 10 min in a 7-mL teflon microvessel. After digestion, the pH of the acidic sediment mixture was adjusted to 6.5 – 7.0 by NaOH. The sediment residue was removed by passing the mixture through a 0.45 μm filter membrane. To the filtrate, sodium acetate buffer (pH = 6.0) and 2,3-dimercaptopropane-1-sulfonate (DMPS) were added to form a mercury-DMPS complex.The complex was preconcentrated on two home-made C18 cartridges in series, and each
cartridge was eluted with methanol and adjusted to 0.50 mL. A portion (50 μL) was introduced into a graphite tube and then measured by GFAAS. The peak heights in absorbance were used for a quantitative analysis. The method detection limit (MDL, 3s)was 6.8 ng/g; the calibration graph was linear up to 308 ng/g. Good accuracies were obtained when testing four sediment certified reference materials (GBW 07305, CRM 016-050, GBW 07311, and BCR CRM-580). Four real river sediment samples collected from central Taiwan were analyzed, and the recoveries were in the range of 97.0 –102.0% with a RSD (n = 3) < 4.7 %. The proposed method can be applied to the measurement of total mercury in sediment samples.