Ion-exchange chromatographic determination of anions by indirect photometric detection: comparison of eluent ions with respect to sensitivity enhancement

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Abstract
Aromatic sulphonate and carboxylate eluent ions were examined for use in the sensitive determination of inorganic anions by indirect photometric ion chromatography. The naphthalene-1,3,6-trisulphonate ion was found to be the most sensitive for use as the eluent ion, the detection limit being as low as 1 × 10–8 mol dm–3. The naphthalene-1,5-disulphonate ion is recommended for the analysis of water samples containing anions at concentrations of between 1 × 10–6 and 1 × 10–5 mol dm–3. These two eluent ions have several advantages over other choices: (i) detection is carried out at longer wavelengths (near 300 nm); (ii) the eluent ions are easily soluble in water and subsequently stable; (iii) their elution strength is not influenced by pH change; (iv) the eluent ions do not form any metal complexes; and (v) the reagents are inexpensive and commercially available.

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