Cation chromatography with a conductivity detector

Three different types of cation exchangers were produced from four basic poly(styrene-divinylbenzene) substrates with different properties. Porous PS-DVB resin beads were functionalized by sulfonation and sulfoacylation under various conditions to produce sulfonated resins with exchange capacities of 0.03-1.80 mM g(-1). The matrix with 50% of cross-linking is most suitable for updating by the proposed technique. Sulfuric and chlorosulfonic acids were used as the reagents for sulfonation. The sulfonating conditions, capacities, and the technique of the synthesis are given. The effects of parameters of the sulfonation reaction and the composition of the reactionary mixture on ion-exchange capacity of the sorbents were investigated. Selectivity and efficiency of the separation of some inorganic cations and derivatives of amines and hydrazines on the resins obtained are compared by ion chromatography with conductometric detection. As a result, the sulfoacylated resin was proved more efficient for the separation of these analytes. The resolution of the analytes strongly depends on the degree of functionalization. The best performance about 19,000 plates m(-1) was obtained using the sulfopropionylated beads with an ion-exchange capacity of 0.3 mM g(-1). The prepared sulfoacylated cation exchanger was compared with the commercially available Dionex CS-12 packing material. It was found that the separation of alkaline ions and 1,1-dimethylhydrazine (UDMH) were much better that those for the commercial material.

show abstract

“…Such an approach to obtain resins with chemically bonded functional groups is successfully applied nowadays [7,8,9,10,11,12,13,14].…”

Section: Introductionmentioning

confidence: 99%

Sulfonated and sulfoacylated poly(styrene?divinylbenzene) copolymers as packing materials for cation chromatography

Пирогов

Chernova

Nemtseva

et al. 2003

Analytical and Bioanalytical Chemistry

View full text Add to dashboard Cite

show abstract

“…The estimated LODs are shown in Table 2. 17 Furthermore, the LODs were comparable to trace level concentrations of these metal ions when analyzed in a suppressed conductivity system employing a sample preconcentration step with a sample volume that was 50X larger than the sample volume used in this CNLSD system. Nonetheless, LODs for these metals were still at the ng/ml level.…”

Section: Sensitivity Of the Methodsmentioning

confidence: 85%

Condensation Nucleation Light Scattering Detection (Cnlsd) for Ion Chromatography

Sadain

Koropchak

1999

Journal of Liquid Chromatography & Related Technologies

View full text Add to dashboard Cite

Ion chromatography (IC) combined with condensation nucleation light scattering detection (CNLSD) is shown here to be a highly sensitive method for cationic species determination, with limits-of-detection (LODs) at ng/mL levels. Furthermore, unlike the common conductivity detection method, higher than normally used acid concentration eluents can be used, resulting in faster elution of the analytes. The use of a suppressor is also eliminated since CNLSD is mainly dependent on the involatility of the analyte relative to the mobile phase, making the detection method universal for most cationic species.Investigative studies were also done on anion separations. In this case, a suppressor was required to improve the background level. Although detection limits for anionic species were not as low as for the cationic species, the results showed CNLSD to be a viable detector for anions, as well.

show abstract

“…Cations of metals, such as Cu, Cd, Pb, Zn, Fe, Ni, Co, Yt, and the rare earths, were determined using polaro-i graphic 1 "' 176 -1891 ' 92 ' 392 -440 ' 441 (a detection limit of 2 ng has been achieved with a DME 441 ), voltammetric," 6 -299 coulometric, 217 -218 ' 220 ' 223 -442 -443 conductometric, 444 and ion-selective potentiometric detectors. 76 Electrochemical detectors have also been used for the determination of inorganic anions, namely, voltammetric, 163 Various organometallic compounds (organomercury, -tin, -lead, -antimony) have been determined in water or in biological species on an amalgamated gold electrode 139 -213 ' 234 ' 446 -447 with a detection limit for CH 3 Hg + of 2 ppb or 1 X 10~8 mol/B ; (DPP measurement).…”

Section: Inorganic and Organometallic Substancesmentioning

confidence: 99%