矿泉水中的汞

AN-V-212

2020-10

Straightforward determination by voltammetry using a gold microwire electrode

汞及其化合物具有毒性。与食物一起摄入的汞化合物造成的慢性中毒风险非常高。环境中的汞有很大一部分来自人类活动。相当大的来源是燃煤发电厂、钢铁和有色金属生产、废物焚烧厂、化学工业或手工采金业，在这些行业中，使用元素汞从矿石中提取黄金仍然很普遍。阳极剥离伏安法的检测限（LOD）为 0.5 微克/升，是原子吸收光谱法（AAS）的一种可行的、不太复杂的替代方法。原子吸收光谱法（以及其他竞争方法）只能在实验室中进行，而阳极溶出伏安法可在实验室中常规使用，也可使用 946 便携式伏安分析仪/946便携式重金属测定仪在野外使用。测定在 scTRACE 金电极上进行。

Mercury and its compounds are toxic. The highest risk is posed by chronic poisoning with mercury compounds ingested with food. A significant part of the mercury present in the environment is of anthropogenic origin. Considerable sources are coal-fired power plants, steel, and nonferrous metal production, waste incineration plants, the chemical industry, or artisanal gold mining where the use of elemental mercury for the extraction of gold from the ore is still common. The guideline value for inorganic mercury in the World Health Organization’s «Guidelines Quality» for Drinking-water is set to 6 μg/L.

With a limit of detection (LOD) of 0.5 μg/L, anodic stripping voltammetry is a viable, less sophisticated alternative to atomic absorption spectroscopy (AAS). While AAS (and competing methods) can only be performed in a laboratory, anodic stripping voltammetry can be used conventionally in the laboratory or alternatively in the field with the 946 Portable VA Analyzer. The determination is carried out on the scTRACE Gold electrode.

Bottled mineral water, spiked

Figure 1. 946 Portable VA Analyzer (scTRACE Gold version)

The scTRACE Gold is electrochemically activated and an ex situ mercury film is deposited prior to the first determination. In the next step, the water sample and the supporting electrolyte are pipetted into the measuring vessel. The determination 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 standard addition solution.

Figure 2. 884 Professional VA fully automated for VA

**Table 1.** Parameters
Parameter	Setting
Mode	DP-Differential pulse
Deposition potential	0.3 V
Deposition time	90 s
Start potential	0.3 V
End potential	0.6 V
Peak potential As	0.44V

scTRACE Gold

The limit of detection of the method is approximately 0.5 μg/L.

Figure 3. Determination of mercury (946 Portable VA Analyzer; 90 s deposition time)

**Table 2.** Results of Hg analysis in spiked bottled mineral water
Sample	Hg (μg/L)
Bottled mineral water	2.1

Application Bulletin 422: Determination of mercury in water with the scTRACE Gold

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矿泉水中的汞

AN-V-212

瑞士万通中国

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