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Analytical Services:
Ion Chromatography

Ion chromatography – Ion chromatography for RoHS legislation analysis of anions, bromides, chlorides, fluorides, nitrates, nitrides, total oxidised nitrogen and sulphates by LSM Analytical Services

Ion chromatography, or ion exchange chromatography to give its full name is a process that allows the separation of ions and polar molecules based on the charge properties of the molecules. Methods have been used since 1850, although it is only since the 1970s that methods for automatic analysis have been developed.

Ion chromatography is a powerful technique for determining low concentrations of ions. It involves the retention of analyte molecules from the sample being retained based on ionic interactions. The method starts with the introduction of a sample into a sample loop of known volume. An aqueous solution (mobile phase) carries the sample from the loop onto a column containing a stationary phase (typically a resin or gel matrix). The stationary phase contains charged groups. The target analytes are retained on the stationary phase. The analytes of interest are detected by some means, typically by conductivity or light absorbance.

RoHS (Restrictions on the use of certain Hazardous Substances in Electrical and Electronic Equipment EEE) is a European directive, which came into force in the UK in 2006. The directive bans the placing on the European market of new EEE more than agreed levels of the following:

• lead
• cadmium
• mercury
• hexavalent chromium
• polybrominated biphenyl (PPB)
• polybrominated diphenyl ether (PBDE)

Producers need to determine if the EEE they are placing in the European market falls within the RoHS regulations; the first decision being whether the goods fall into one of the 10 categories listed under WEEE above.

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