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饮用水中的铁

AN-V-216

2020-10

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Straightforward determination by voltammetry using a gold microwire electrode (DHN method)

铁是人体营养中不可或缺的元素。饮用水中的铁可能是水处理或水管系统腐蚀的结果。世界卫生组织的 “饮用水水质指南 ”中没有规定铁的指导值，因为饮用水中通常的铁含量并不令人担忧。不过，各国都有国家限值。欧盟规定铁的指导指标值为 200 μg/L。 对于饮用水中铁的测定，伏安法是原子吸收光谱法（AAS）的一种可行但不太复杂的替代方法。原子吸收光谱法（和其他竞争方法）只能在实验室中进行，而阳极剥离伏安法测定可在实验室中使用传统方法，或使用 946 便携式伏安分析仪在现场进行。在 scTRACE 金电极上使用 2,3-二羟基萘 (DHN) 通过吸附剥离伏安法 (AdSV) 进行测定。

Iron is an essential element in human nutrition. It can be present in drinking water as a result of water treatment or from corrosion in the water piping system. There is no guideline value for iron in the World Health Organization’s «Guidelines for Drinking-water Quality» because typical levels usually found in drinking water are of no concern. However, there are national limit values in various countries. The European Union has set a guideline indicator value for iron of 200 μg/L.

Voltammetry is a viable, less sophisticated alternative to atomic absorption spectroscopy (AAS) for the determination of iron in drinking water. While AAS (and competing methods) can only be performed in a laboratory,  adsorptive stripping voltammetric determinations can be done used conventionally in the laboratory or alternatively in the field using the with 946 Portable VA Analyzer. The determination is carried out with adsorptive stripping voltammetry (AdSV) using 2,3-dihydroxynaphthalene (DHN) 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.

Figure 2. 884 Professional VA fully automated for VA
Table 1. Parameters
Parameter Setting
Mode DP – Differential Pulse
Deposition potential 0 V
Deposition time 30 s
Start potential -0.3 V
End potential -0.95 V
Peak potential Fe -0.65 V
  • scTRACE Gold

The limit of detection of the method is about 10 μg/L with the 946 Portable VA Analyzer, and approximately 0.3 μg/L with the 884 Professional VA.

Figure 3. Determination of iron in tap water (946 Portable VA Analyzer; 30 s deposition time)
Table 2. Results for the measurement of Fe in spiked tap water
Sample Fe, blank subtracted (μg/L)
Tap water (spiked) 10
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Internal references: AW VA CH4-0578-032019; AW VA CH4-0582-042019