Abstract
The advantages of thermal lens spectrometry (TLS) and amperometry in comparison to UV–Vis spectrophotometry were tested for Fe 3+ and Fe 2+ detection after their ion chromatographic separation. Iron species were separated on Dionex IonPac CS5A analytical column as anions using a PDCA-based eluent. Non-specific [4-(2-pyridylazo)resorcinol] as well as specific (1,10-phenanthroline in combination with Fe 3+ reducing agent-ascorbic acid) as post-column reagent were tested. Lower detection limits were obtained when selective and colourless post-column reagents were used in combination with TLS detection (25 μg l −1 for Fe 3+ and 5 μg l −1 for Fe 2+). Electrochemical detection was also used in some experiments because of its wide linear concentration range and selectivity based on the selection of the applied potential. All three detection systems were tested for the detection of Fe 3+ and Fe 2+ (in synthetic samples) and Fe 3+ (in real samples) in the presence of high concentrations of Cu 2+ and Mn 2+. Electrochemical detection was found to be the most suitable among the detection systems used for Fe 3+ detection in samples with high Cu 2+ concentration due to the possibility of elimination of Cu 2+ interference by post-column copper masking.
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