Basic Ion Chromatography: Anion Analysis Edition [Technical Document]

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60-70% of the purposes for which ion chromatography is used are for anion analysis. The reason for this is clear: cation analysis, especially for alkali metals and alkaline earth ions, can be easily and accurately measured using atomic absorption spectrometry (AAS) or inductively coupled plasma atomic emission spectrometry (ICP-AES). Ammonium ions can also be easily measured using the indophenol blue spectrophotometric method. However, it is not the same for anions. Even with AAS or ICP-AES, it is not possible to measure halogen ions. The same goes for ions such as nitrate, nitrite, phosphate, and sulfate, which cannot be detected or have low sensitivity, making actual measurement impossible. Fluoride ions, nitrate/nitrite ions, and phosphate ions can be measured with relatively high sensitivity using lanthanum chromogenic complex spectrophotometry, copper/cadmium reduction-naphthyl ethylenediamine spectrophotometry, and molybdenum blue spectrophotometry, respectively. However, these methods are quite cumbersome and take a considerable amount of time, so they are not necessarily convenient methods. For chloride ions and sulfate ions, there are no good methods available, and silver nitrate titration or gravimetric methods are often used.

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  Metrohm Ion Chromatograph 940/930/Eco IC