Strong-anion-exchange liquid

A high-performance liquid chromatographic method for nalidixic acid on a strong anion-exchange resin column has been reported, using a mobile phase of 0.01 M sodium tetraborate at pH 9.2 and 0.003 M sodium sulfate. The relative retention time for nalidixic acid in the system reported by Sondach and Koch was 0.86 with sulfanilic acid as the standard at... 

Arsenic species were preconcentrated on Zipax, a pellicular anion exchange material and separated on a column packed with high performance liquid chromatography grade strong anion exchange resin, then continuously reduced with sodium tetrahydroborate and detected by atomic absorption spectrometiy. Detection limits were 2ng for arsenite, arsenate and monomethylarsinate and lng for dimethylarsonate. 

Apparatus Use a suitable high-performance liquid chromatography system (see Chromatography, Appendix IIA) equipped with a dual wavelength detector system such that the effluent can be monitored serially at 254 nm and 325 to 385 nm (wide-band pass). Use a 1-m x 2.1-mm (id) column, or equivalent, packed with a strong anion-exchange resin (Dupont No. 830950405, or equivalent). 

Figure 4.9. On-line coupling of USAL and detection with (B) and without (A) an intermediate preconcentration-clean-up step for the determination of hexavalent chromium in soil. AS — acid stream, D — debubbler, DPC — diphenylcarbazide, DS — detection system, FC — flow cell, IV — injection valve, L — leachant, LC — leaching chamber, MC — mixing coil, PL — propagating liquid, PP — peristaltic pump, PC — reaction coil, SAEC — strong anion-exchange column, S / — switching valve, UP— ultrasonic probe, 1/1/— waste and 1/1/6 — water bath. (Reproduced with permission of the Royal Society of Chemistry, Ref [10].)...

Fig. 1.5. High-performance liquid chromatographic separation of phosphorus compounds determined in soil leachate using a strong anion exchange stationary phase. Reprinted from Espinosa etal. (1999) with permission from the American Society of Agronomy.

Fig. 10. Separation of a mixture of ionic liquid cations and anions (concentration 0.5 mM each) with use of tandem ion exchange columns. 1, DMIM 2, NMIM 3, OMIM 4, HMIM 5, TfzN- 6, AMIM 7, PFs- 8, BF4- 11, Br 12, Cl- 13, BMIM signals 9,10 unidentified. Conductivity detection. Mobile phase 5 mM potassium hydrogen phthalate/lSmMphthalicacid, 45% (v/v) acetonitrile pH 3.05. Absolute conductivity of mobile phase, 476 pS/ cm flow rate, 1 mL/ min injection volume, 100 pL. Columns in the order strong anion exchange Phenosphere SAX, strong cation exchange Luna SCX. (Markowska Stepmowski, 2008).

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