Institut für Chemie und Biologie des Meeres (ICBM), Universität Oldenburg, Oldenburg, Germany.
Talanta. 2011 Sep 15;85(3):1695-7. doi: 10.1016/j.talanta.2011.06.031. Epub 2011 Jun 17.
We present a method for the rapid and direct determination of dissolved Thallium (Tl) using high resolution sector field inductively coupled mass spectrometry (SF-ICP-MS) suitable for the measurement of large time series (e.g. during monitoring). Thallium data are presented for a series of natural sea water samples, which were validated with sea water standards CASS-4 and NASS-5. The sea water samples and standards were diluted 10 times prior to measurement with SF-ICP-MS in low resolution mode (R=300, LR). For both CASS-4 and NASS-5 (salinity of 30.5) we calculated a concentration of about 11 ng L(-1) when using Tl values of 14±2 ng L(-1) (at salinity of 35±1) published by Flegal and Patterson for Atlantic and Pacific sea water. For CASS-4 we report a Tl value of 10.6±0.7 ng L(-1) (n=70), for NASS-5 a Tl value of 10.3±0.8 ng L(-1) (n=11). For Tl in both CASS-4 and NASS-5, the overall error in accuracy and precision is less than 4% and 8% (2s), respectively. Further, values of 7.7±0.3 and 6.7±0.2 ng L(-1) Tl were found for the estuarine standard SLEW-3 (salinity of 15) and the river water standard SLRS-4, respectively, for which no certified value exists so far. The detection and quantification limits of our method are 0.1 and 0.3 ng L(-1), respectively. Slight differences in the accuracy of our method and other published methods for the determination of Tl in sea water are discussed. Time-series of natural coastal water samples gave Tl values (6-12 ng L(-1)), which correspond to determined salinities, and hence, appear realistic and oceanographically consistent.
我们提出了一种使用高分辨率扇形场电感耦合质谱（SF-ICP-MS）快速直接测定溶解态铊（Tl）的方法，该方法适用于大时间序列的测量（例如监测期间）。我们给出了一系列天然海水样本的铊数据，这些数据已经过海水标准 CASS-4 和 NASS-5 的验证。在使用 SF-ICP-MS 进行测量之前，将海水样本和标准品稀释 10 倍，采用低分辨率模式（R=300，LR）。对于 CASS-4 和 NASS-5（盐度为 30.5），当使用大西洋和太平洋海水 Flegal 和 Patterson 公布的 Tl 值 14±2 ng L(-1)（盐度为 35±1）时，我们计算出浓度约为 11 ng L(-1)。对于 CASS-4，我们报告了 10.6±0.7 ng L(-1)（n=70）的 Tl 值，对于 NASS-5，我们报告了 10.3±0.8 ng L(-1)（n=11）的 Tl 值。对于 CASS-4 和 NASS-5 中的 Tl，准确度和精密度的总误差分别小于 4%和 8%（2s）。此外，对于盐度为 15 的河口标准 SLEW-3 和尚无认证值的河水标准 SLRS-4，我们分别发现了 7.7±0.3 和 6.7±0.2 ng L(-1)的 Tl 值。我们方法的检测限和定量限分别为 0.1 和 0.3 ng L(-1)。我们讨论了方法的准确度与其他已发表的海水铊测定方法之间的细微差异。天然近岸水样的时间序列给出了（6-12 ng L(-1)）的 Tl 值，这些值与测定的盐度相对应，因此，似乎是现实的，具有海洋一致性。
