Abstract
A simple dual vessel in situ analyte distillation (IAD) system has been developed for suppressed ion chromatographic determination of chloride and fluoride ions in complex matrices. In IAD system, water vapours generated from the outer vessel reacts with sulfuric acid generating heat, thus favouring the quantitative distillation of chloride and fluoride within 30 min on water bath temperature (∼80 °C). The distilled analytes, as their respective acids in water, were directly injected into an ion-chromatograph. This newly developed method has been applied for analysis of trace impurities in H 2SO 4, H 3PO 4 and H 3BO 3. The detection limits for chloride is 8, 80 and 70 ppb (w/w) for H 2SO 4, H 3PO 4 and H 3BO 3, respectively. For fluoride the detection limits are 6 and 60 ppb (w/w) for H 2SO 4 and H 3PO 4, respectively. The recovery of spikes for both the analytes ranged between 87 and 100%.
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