China
Africa
Explore chapters and articles related to this topic
Using iodine for analysis
Published in Tatsuo Kaiho, Iodine Made Simple, 2017
Ion chromatography is a type of liquid chromatography which can qualify and quantify anions such as chloride ions, fluoride ions, and sulfate ions and cations such as sodium ions and ammonia ions with high sensitivity. Ion chromatography uses ion-exchange resin as the stationary phase. By utilizing the difference in the time each substance remains on the ion-exchange resin according to the strength of the charge, substances within a sample can be separated. In the suppressor between the column and the detector, ions which were originally included in the mobile phase are removed and placed on the detector.
Water Quality Monitoring
Published in Béla G. Lipták, Analytical Instrumentation, 2018
Chromatographs are typically utilized when it is necessary to monitor specific organics in water (Section 11). Generally, chromatographs represent the most sophisticated semi-continuous monitor utilized in water analysis. When used for water analysis the chromatograph requires specialized sample conditioning methods. Most chromatographs will be provided with either sparging or purge and trap devices to separate the components of interest from the water sample. More recently, chromatographs have also been utilized to measure the concentration of specific ions (hence, ion chromatography) in water.
Chromatographic Methods
Published in Somenath Mitra, Pradyot Patnaik, Barbara B. Kebbekus, Environmental Chemical Analysis, 2018
Somenath Mitra, Pradyot Patnaik, Barbara B. Kebbekus
Ion chromatography is used for separation of ionic species. The stationary phase is an ion exchange resin, and retention of the ionic species occurs as they are exchanged onto and off the resin surface. A cation exchange resin has R–H+ groups on its surface and, a cation such as Zn++ is retained because it exchanges with the hydrogen ions on the resin: R−H+ + Zn++ ⇔ R−Zn++ + H+
Phosphorus in water: A review on the speciation analysis and species specific removal strategies
Published in Critical Reviews in Environmental Science and Technology, 2023
Yuqian Jia, Shuhui Sun, Shu Wang, Xing Yan, Jieshu Qian, Bingcai Pan
IC technique has been used for the analysis of P species in water mostly for phosphate and TP, with fewer examples for other IP (reduced and condensed P) and OP (e.g., phytates, alkyl phosphate, and phosphonates) (Ruiz-Calero & Galceran, 2005). IC possesses the advantages of high sensitivity and accuracy with LOD at μg/L level. IC includes multiple chromatographic systems for ion determination, such as ion-exchange chromatography (IEC), ion-exclusion chromatography, chelation ion chromatography, and the novel electrostatic ion chromatography. Among them, IEC based on suppressed conductivity detection is preferred for the detection of phosphate (Lu et al., 2002; Ruiz-Calero & Galceran, 2005), while techniques based on non-suppressed conductivity detection are rarely used due to the poor sensitivity of the system. Current research efforts concerning IC include the development of new stationary phase and inhibition system, and the improvement of analysis of anions in reversed-phase chromatographic columns, for more effective separation and lower LOD for P detection. Moreover, IC has also been coupled with other detection techniques such as ICP-MS, UV, evaporative laser light scattering detector (ELSD), and refractive index (Buchberger, 2000).