Citation: CHEN Ailian, DING Hui, FANG Linmei, SHI Chaoou. Determination of inorganic anions and gluconate by two-dimensional ion chromatography[J]. Chinese Journal of Chromatography, ;2015, 33(12): 1333-1337. doi: 10.3724/SP.J.1123.2015.08036 shu

Determination of inorganic anions and gluconate by two-dimensional ion chromatography

1.
Analysis and Testing Center, East China University of Science and Technology, Shanghai 200237, China

Corresponding author: SHI Chaoou,
Received Date: 31 August 2015

A new two-dimensional ion chromatography method was developed to parallelly analyze two different types of samples with the application of valve switching technology-suppressed conductivity and pulsed amperometric analysis system, for concurrent determination of chloride, nitrite, sulfate, nitrate four inorganic anions and gluconate. The first dimensional chromatography was using Ionpac AG18+Ionpac AS18 anion analysis columns with a suppressed conductivity detector for the separation and detection of Cl^-, NO₂^-, SO₄^2- and NO₃^-. Respectively, the elution was 5 and 20 mmol/L NaOH at an isocratic flow rate of 1.0 mL/min and sample injection volume of 25 μL. The second dimensional chromatography was utilizing two guard columns, CarboPac PA1 and CarboPac PA20, with 90 mmol/L NaOH solution for the isocratic eluent of 0.8 mL/min. Gluconate was enriched by an AG15 column and switched into the pulsed amperometric detector. The results showed that: each inorganic anion in 0.1-5.0 mg/L and gluconate in 0.0856-4.2825 mg/L had a good linear relationship (R²≥0.9945). The RSDs of the peak areas were between 1.05%-1.94%. The limits of detection were 0.61-2.17 μg/L for the anions and 24.24 μg/L for the gluconate. The recoveries were between 90.3%-102.8%. The two detection modes parallelly have good separation efficiency, detection accuracy and the precision of the separation and are suitable for the analysis of complex samples.
- two-dimensional ion chromatography,
- conductivity,
- pulsed amperometric,
- inorganic anion,
- gluconate
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沈阳化工大学材料科学与工程学院沈阳 110142