Determination of trace anions in organic solvents.
Ion chromatography along with matrix elimination was used to reliably determine trace levels of anionic contaminants in organic solvents. A 5-ml sample volume was injected directly into the instrument without any sample pretreatment. High-purity deionized water was used to deliver the sample to a preconcentration column, where the anions of interest were retained while the organic matrix was rinsed to waste. A sodium carbonate eluent eluted concentrated anions from the preconcentration column and separated them on a 2-mm pellicular anion-exchange column. The separated anions were detected by suppressed conductivity. This method was used to determine the anionic contaminants of isopropanol, acetone and N-methylpyrrolidone. Method detection limits for chloride, nitrate, sulfate and phosphate were all lower than 1 microg/l.
Kaiser
E
E
Dionex Corporation, Sunnyvale, CA 94088-3603, USA. edward_kaiser@dionex.com
Rohrer
J
J
D000838:Anions / Q000032:analysis*; D002853:Chromatography, Liquid / Q000379:methods; D004563:Electrochemistry; D009930:Organic Chemicals / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*
D000838:Anions; D009930:Organic Chemicals; D012997:Solvents