Simultaneous Determination of Inorganic Cations by Capillary Ion Chromatography with a Non-suppressed Contactless Conductivity Detector

Abstract

A non-suppressed capillary ion chromatographic method with a laboratory-made packed cation-exchange column (100 mm × 0.32 mm i.d.) was developed for the separation and simultaneous determination of five common inorganic cations (sodium, ammonium, potassium, magnesium and calcium). Cation exchangers were prepared by the reaction of the hydroxyl group on the surface of diol-group bonded silica gel with 1,3-propanesultone in methanol. Simultaneous separation of these five common inorganic cations were achieved within 17 min using 1 mM methanesulfonic acid and 0.1 mM 15-crown-5 ether in methanol-water (8:2, v/v) as the eluent. The effects of organic solvents and crown ethers in the eluent on the retention of analytes were investigated. The limits of detection (S/N = 3) of the cations were in the range of 18 -124 μg/l, the linear correlation coefficients were 0.9991 -0.9998, and the RSD values of retention time and peak height were all smaller than 2.1%. The present analytical method was successfully applied to the rapid and direct determination of inorganic cations in samples of river water and commercial drinks, with satisfactory results.

Preparation of a hybrid monolithic stationary phase with allylsulfonate for the rapid and simultaneous separation of cations in capillary ion chromatography

“…This value showed the satisfactory preformances reproducibility of the AS‐hybrid monolith. Based on this result, the AS‐hybrid monolith in our study showed better improvement on performance than in other previous literatures that determination of common inorganic cations using diol‐group bonded silica gel with 1,3‐propanesultone , which indicated that the AS‐hybrid monolith columns had exceptional reproducibility, and the preparation of organic‐inorganic hybrid monolithic column using “one‐pot” approach manner was feasible.…”

Qualitative and quantitative 1H NMR spectroscopy for determination of divalent metal cation concentration in model salt solutions, food supplements, and pharmaceutical products by using EDTA as chelating agent

“…Using the sample preparation conditions outlined in Section 2.2.3, limit of quantifications (LOQs) were found to be between 5 and 22 μg/ml. These values were higher than the LOQ values obtained by another NMR method that was developed to quantify cations in mineral water with LOQs of 1.39 mg/L for Ca 2+ and 0.87 mg/L for Mg 2+ and by flame atomic absorption spectrometry and ion chromatography . However, to achieve a lower LOQ, several options are possible.…”

Contactless conductivity detection for analytical techniques: Developments from 2010 to 2012

“…Shen et al reported the determination of inorganic anions and cations in bench‐top IC systems employing monolithic columns . Rong et al reported the separation of inorganic cations on a packed capillary column . C 4 D continues to be used as a diagnostic tool in the characterization of monolithic chromatographic columns for IC and HPLC .…”