饮用水中的铜

AN-V-213

2020-10

Straightforward determination by voltammetry using a gold microwire electrode

饮用水中的铜含量较高通常是由于铜管中的铜被水浸泡后产生的腐蚀作用造成的。虽然铜是人体必需的营养物质，但摄入较高浓度的铜会对人体健康产生不利影响。世界卫生组织现行的 “饮用水水质指南 ”建议铜的最高浓度为 2000 微克/升。阳极剥离伏安法的检出限（LOD）为 0.5 μg/L，在测定饮用水中的铜含量时，阳极剥离伏安法是原子吸收光谱法（AAS）的可行且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，而阳极剥离伏安法可在实验室中常规使用，也可使用 946 便携式重金属快速分析仪在现场进行。测定在 scTRACE 金电极上进行。

Higher levels of copper in drinking water are usually caused by corrosive action of water leaching copper from copper pipes. While copper is an essential nutrient for the human body, ingestion of higher concentrations have an adverse effect on our health. The current World Health Organization’s «Guidelines for Drinking-water Quality» recommend a maximum concentration of 2000 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) for the determination of copper in drinking water. 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.

Tap water

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

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 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.

**Table 1.** Parameters
Parameter	Setting
Mode	DP – Differential pulse
Deposition potential	-0.3 V
Deposition time	30 s
Start potential	-0.1 V
End potential	0.6 V
Peak potential Cu	0.25 V

scTRACE Gold

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

Figure 3. Determination of copper in tap water (946 Portable VA Analyzer; 30 s deposition time)

**Table 2.** Results of Cu analysis in tap water
Sample	Cu (μg/L)
Tap water	5.1

Application Bulletin 429: Determination of copper in water with the scTRACE Gold

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饮用水中的铜

AN-V-213

瑞士万通中国

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