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摘要
The simultaneous determination of six inorganic anions [iodate (IO3-), bromate (BrO3-), nitrite (NO2-), nitrate (NO3-), bromide (Br-), and iodide (I-)] in seawater was examined by ion chromatography (IC). The separation and detection of the anions were examined using a dodecylammonium chloride (DAC)-coated C18-silica column or a DAC-coated C18 polymer column (150 mm x 4.6 mm id, each) and a concentrated aqueous NaCl solution containing 0.5 mM DAC and 5 mM phosphate buffer (pH 2.0-6.5) with ultraviolet detection (UV) at 225 nm. For DAGcoated C18-polymer column, separation was also examined for eluents of an alkaline solution (pH 7.0-10.0). For the DAGcoated C18-silica column, good separation and detection were obtained for all six anions in pure water and 35(sic) artificial seawater without interferences from matrix ions such as chloride and sulfate. The anions were retained mainly on the DAGcoated C18 silica column through the anion-exchange properties and hydrogen bonding with the NH proton. On the other hand, the separation and detection were insufficient for the DAC-coated C18 polymer column For optimized IC systems using the C18 silica column, good separation and detection for the anions in 35 %o artificial seawater were obtained within 25 min NaCl in the eluent enhanced the DAC coating. The 0.5 mM DAC in the eluent helps to maintain the performance of the coated columns Good repeatability [RSD < 1.24 % (n = 5)] for the retention time, peak height, and peak area and calibration curves (r(2) > 0.999 for peak area method) were obtained for all of the anions. The detection limits (S/N= 3) with a 100 pi sample injection were 7.5 mu g L-1 for IO3-, 17.3 mu g L-1 for BrO3-, 83.2 mu g L-1 for Br-, 0.73 mu g L-1 for NO2-, 1.5 mu g L-1 for NO3-, and 0.73 mu g L-1 for F. The present IC system was successfully applied to real seawater samples with recovery rates of 99-109 % for all of the ions.
- 出版日期2015-8
