Low-pressure gradient micro-ion chromatography with ultra-short monolithic anion exchange column

The Analyst ◽  
2004 ◽  
Vol 129 (8) ◽  
pp. 700 ◽  
Author(s):  
Danielle Victory ◽  
Pavel Nesterenko ◽  
Brett Paull
Keyword(s):  
Pressure Gradient ◽  
Anion Exchange ◽  
Ion Chromatography ◽  
Low Pressure ◽  
Anion Exchange Column ◽  
Exchange Column

Determination of Free Sulfites (SO3–2) in Dried Fruits Processed with Sulfur Dioxide by Ion Chromatography through Anion Exchange Column and Conductivity Detection

2013 ◽  
Vol 96 (5) ◽  
pp. 1103-1108 ◽  
Author(s):  
Benjamin S Liao ◽  
Jacqueline C Sram ◽  
Darin J Files
Keyword(s):  
Sulfur Dioxide ◽  
Anion Exchange ◽  
Ion Chromatography ◽  
Room Temperature ◽  
Anion Exchange Column ◽  
Dried Fruits ◽  
Exchange Column ◽  
Sample Extract ◽  
Sample Extraction

Abstract A simple and effective anion ion chromatography (IC) method with anion exchange column and conductivity detector has been developed to determine free sulfites (SO3–2) in dried fruits processed with sulfur dioxide. No oxidation agent, such as hydrogen peroxide, is used to convert sulfites to sulfates for IC analysis. In addition, no stabilizing agent, such as formaldehyde, fructose or EDTA, is required during the sample extraction. This method uses aqueous 0.2 N NaOH as the solvent for standard preparation and sample extraction. The sulfites, either prepared from standard sodium sulfite powder or extracted from food samples, are presumed to be unbound SO3–2 in aqueous 0.2 N NaOH (pH > 13), because the bound sulfites in the sample matrix are released at pH > 10. In this study, sulfites in the standard solutions were stable at room temperature (i.e., 15–25°C) for up to 12 days. The lowest standard of the linear calibration curve is set at 1.59 μg/mL SO3–2 (equivalent to 6.36 μg/g sample with no dilution) for analysis of processed dried fruits that would contain high levels (>1000 μg/g) of sulfites. As a consequence, this method typically requires significant dilution of the sample extract. Samples are prepared with a simple procedure of sample compositing, extraction with aqueous 0.2 N NaOH, centrifugation, dilution as needed, and filtration prior to IC. The sulfites in these sample extracts are stable at room temperature for up to 20 h. Using anion IC, the sulfites are eluted under isocratic conditions with 10 mM aqueous sodium carbonate solution as the mobile phase passing through an anion exchange column. The sulfites are easily separated, with an analysis run time of 18 min, regardless of the dried fruit matrix. Recoveries from samples spiked with sodium sulfites were demonstrated to be between 81 and 105% for five different fruit matrixes (apricot, golden grape, white peach, fig, and mango). Overall, this method is simple to perform and effective for the determination of high levels of sulfites in dried fruits.

Ion Chromatography on a New Moderate Capacity Anion Exchange Column

1993 ◽  
Vol 31 (9) ◽  
pp. 366-370
Author(s):  
R. E. Smith ◽  
D. Yourtee ◽  
T. Bean ◽  
R. A. MacQuarrie
Keyword(s):  
Anion Exchange ◽  
Ion Chromatography ◽  
Anion Exchange Column ◽  
Exchange Column

Determination of Fluoride in Antarctic Krill by Ultrasonic Extraction and Ion Chromatography

2014 ◽  
Vol 998-999 ◽  
pp. 219-223
Author(s):  
Hai Lan Huang ◽  
He Cui ◽  
Jia Min Ma ◽  
Kai Liang Leng ◽  
Wen Hao Zhang ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Correlation Coefficient ◽  
Ion Chromatography ◽  
Calibration Curve ◽  
Antarctic Krill ◽  
Linear Range ◽  
Ultrasonic Extraction ◽  
Anion Exchange Column ◽  
Exchange Column

A method was developed for the determination of inorganic and total fluoride in Antarctic krill by using Ultrasonic Extraction and Ion Chromatography (IC). The analyte is separated by the anion exchange column AS-15 and detected with the conductive detector. The linear range of the calibration curve for fluorinion was 0.25 mg/L to 10 mg/L with a correlation coefficient of 0.9993, and the recovery of this method was 89.62% to 103.91%, and the RSD was lower than 7.09%, the LOD of this method was 0.008 mg/L and LOQ was 0.025 mg/L. Both inorganic and total fluoride in Antarctic krill were higher than GB 2762-2005, but they all much lower than ever reported.

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