饮用水中的碲(IV)

AN-V-234

2020-10

Direct determination in low μg/L range on the scTRACE Gold

碲是近期被确定为光伏转换、量子点以及热电技术的关键技术元素之一，并有可能成为一种新出现的污染物。迄今为止，世界卫生组织的《饮用水水质指南》和《欧洲饮用水指令》中都没有关于饮用水中碲（IV）浓度的指导值。为了监测饮用水中的碲（IV）含量，建议在未改性的 scTRACE Gold 上进行阳极溶出伏安法 (ASV)。当使用 90 秒沉积时间时，该方法可测定 1 µg/L 至 60 µg/L 浓度范围内的碲(IV)。scTRACE 金电极无需机械抛光等大量维护工作。可以在实验室使用 884 专业伏安极谱仪进行测量，也可以在现场使用 946 便携式重金属快速分析仪进行测量。

Tellurium is one of the elements recently identified as technologically critical for photovoltaic conversion, quantum dots, as well as in thermoelectric technology, and has the potential to become a new emergent contaminant. Until now there is no guideline value in the World Health Organization’s «Guidelines for Drinking-water Quality» and in the European Drinking Water Directive for tellurium(IV) concentration in drinking water.

To monitor the tellurium(IV) levels in drinking water, anodic stripping voltammetry (ASV) performed on the unmodified scTRACE Gold is recommended. This method allows determination of tellurium(IV) in the concentration range between 1 μg/L and 60 μg/L when using a 90 s deposition time.

The advantage of this method lies in the innovative and cost-effective sensor used for this application: the scTRACE Gold. It is a combined sensor containing the working, reference, and auxiliary electrode integrated on a single ceramic substrate. The scTRACE Gold electrode does not need extensive maintenance such as mechanical polishing. Measurements can be performed in the laboratory with the 884 Professional VA or alternatively in the field with the 946 Portable VA Analyzer.

Drinking water, mineral water

Figure 1. 946 Portable VA Analyzer (scTRACE Gold)

The scTRACE Gold is electrochemically activated prior to the first determination. In the next step, the water sample and the supporting electrolyte are pipetted into the measuring vessel. The determination of tellurium(IV) is carried out with the 884 Professional VA or with the 946 Portable VA Analyzer using the parameters specified in Table 1. The concentration is determined by two additions of a tellurium(IV) standard addition solution.

Figure 2. 884 Professional VA, semiautomated for VA analysis

**Table 1.** Parameters
Parameter	Setting
Mode	DP – Differential Pulse
Deposition potential	-0.3 V
Deposition time	90 s
Start potential	0.1 V
End potential	0.8 V
Peak potential Te	0.475 V

scTRACE Gold

At a 90 s deposition time, this method is suitable for the determination of tellurium(IV) in water samples in concentrations of β(Te(IV)) = 1–30 μg/L using the 884 Professional VA and β(Te(IV)) = 2–75 μg/L using the 946 Portable VA Analyzer.

Figure 3. Determination of Te(IV) in mineral water spiked with 10 μg/L (946 Portable VA Analyzer; 90 s deposition time)

**Table 2.** Results of Te measured in a spiked mineral water sample
Sample	Te(IV) (μg/L)
Mineral water spiked with 10 μg/L	11.5

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瑞士万通中国

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Internal references: AW VA CH4-0600-082020, AW VA CH4-0602-092020

饮用水中的碲(IV)

AN-V-234

瑞士万通中国

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