Determination of inorganic anions by high performance liquid chromatography

Simultaneous determination of inorganic anions and cations by ion chromatography with EDTA (ethylenediaminetetraacetic acid) as eluent

Simultaneous determination of anions and metal cations by single-column ion chromatography with ethylenediaminetetraacetate as eluent and conductivity and ultra-violet detection

Combination of suppressed and non-suppressed ion chromatography with atmospheric pressure ionization mass spectrometry for the determination of anions

The novel grafted silica supports were investigated. The anion exchanger was prepared by chemical modification of a bare silica gel surface. The support was coated with a polymeric moiety formed by condensation polymerization of primary amine with diepoxide. The synthesized copolymer of methylamine (MA) and 1,4-butanedioldiglycidyl ether (BDDE) exhibited a dendrimer structure. The prepared materials were characterized by elemental analysis, FT-IR spectroscopy and solid state 13C and 29Si NMR CP-MAS spectroscopy. The porous structure of the adsorbents was investigated using the low temperature nitrogen adsorption (LTNA) method. It allows determination of the influence of the topology of packing materials on their chromatographic properties. Imaging was also carried out on the surfaces of the synthesized materials by scanning electron microscopy (SEM). The obtained stationary phase was applied in ion chromatography for the separation of inorganic anions (F−, Cl−, NO2−, Br−, NO3−, HPO42−, SO42−, ClO4−). Bicarbonate buffer was used as a mobile phase.

Dendrimer modified silica gel for anion exchange chromatography: synthesis, characterization and application

High-performance ion chromatography of anions

PURPOSE:To execute exact liquid injection with a simple operation by constituting a liquid injecting device in such a manner that the operation for injecting selectively two kinds of liquids into the stationary flow of the other liquid can be executed by only the rotating operation of one rotor. CONSTITUTION:The liquid passage (a)-(a' A) (j) is formed and the flow of the eluate is stationary while a stator 21 and the rotor are in a neutral position (liquid pulling mode). The liquid passage C D (b) loop 30 (e) E (d) is formed and the sample S1 is packed into the loop 30 in a sample S1 system. S2 is filled into a loop 31 by the liquid passage (h) G (i) loop 31 (f) F (g) of the S2 system. Only the sample S1 in the loop 30 is admitted to the eluate I and the injection of S1 as 'plug flow' is realized in the injection mode in which the rotor is slide and rotated 40 deg. clockwise with respect to the stator 21. The various relative positioning of the rotor and stator is further made possible by the simple rotating operation and since the various functions are selected, the exact liquid injection is made possible.

Keiichi Hosako

Papers

High-performance ion chromatography of anions

Liquid injecting device