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Flow gradient liquid chromatography using a coated anion exchange microcolumn
Author(s) -
Nesterenko Ekaterina P.,
Barron Leon P.,
Nesterenko Pavel N.,
Paull Brett
Publication year - 2006
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.200500335
Subject(s) - chemistry , iodate , chromatography , iodide , ion chromatography , chloride , detection limit , thiocyanate , salt (chemistry) , column chromatography , bromate , conductometry , analytical chemistry (journal) , bromide , inorganic chemistry , organic chemistry
Ion chromatography on a 4.0‐mm‐long (3.0 mm ID) ion exchange column is presented. Using a 10 mM phosphate buffer (pH 2.22) the separation of up to six UV‐absorbing anions was obtained using the microcolumn, containing 5 μm RP support (Phenomenex Gemini) coated with the zwitterionic surfactant, ( N ‐dodecyl‐ N , N ‐dimethylammonio) undecanoate. The short analytical column facilitated the application of a flow gradient programme over the flow range 0.3–5 mL/min resulting in optimum resolution of nitrite, nitrate, benzoate, iodide, thiocyanate and trichloroacetate in less than 10 min. The effect of both eluent concentration and pH on the retention of six selected anions was investigated, showing a strong pH capacity dependence. The microcolumn was found to exhibit no selectivity towards chloride and so was well suited to the analysis of saline samples. To illustrate this, the rapid analysis of a concentrated iodized table salt sample (20 g/L) was carried out. Following standard addition, a concentration of 3.55 ± 0.05 μg iodide/g and 1.05 ± 0.02 μg iodate/g in the solid salt sample was determined.