Ion-exclusion/cation-exchange Chromatography with Dual Detection of the Conductivity and Spectrophotometry for the Simultaneous Determination of Common Inorganic Anionic Species and Cations in River and Wastewater

Milestone Studies on Ion-exclusion Chromatography of Ionic and Nonionic Substances Utilizing Multifunctional Separation Mechanism of Ion-exchange Resins

“…Furthermore, in 2011, the IEC/CEC for the simultaneous determinations of common inorganic anionic species (SO4 2 -, Cl -, NO3 -, PO4 3and silicate ion) and cations (Na + , NH4 + , K + , Mg 2+ , and Ca 2+ ) were obtained using an IC-system consisting of a WCX column in the H + -form and dual detections of conductivity and colorimetry at 700 nm in tandem by elution with a mixture of 100 mM ascorbic acid and 4 mM 18 -crown-6 as an acidic eluent at pH 2.6 in ca.15 min. 72 Interestingly, the ascorbic acid functioned not only as the reducing agent in the molybdenum blue system but also as the eluent. This method was successfully applied to practical river water and wastewater, as show n in Fig.…”

“…10. 72 [Fig. 10] 4.2 Practical application to water quality monitoring of river water and sewage water samples…”

Indirect UV Detection-Ion-exclusion/Cation-exchange Chromatography of Common Inorganic Ions with Sulfosalicylic Acid Eluent

“…[1][2][3][4][5][6][7][8] One advantage of IEC/CEC is the ability to simultaneously separate common inorganic/organic anions and cations in a single run using a simple equipment configuration with just a single column, injection, elution, and detector. In addition, the development of IEC/CEC is ongoing, and analytical performance has been improved for the purpose of analyzing water samples originating from various environments.…”

“…Nakatani et al separated 12 different ions by combining UV detection with postcolumn derivatization for phosphate and silicate ions after conductometric detection (CD). 8 The method was successfully applied to the analysis of river water and wastewater samples.…”

“…The present method was successfully applied to determine common inorganic ions in a pond water sample. photometric detection in a postcolumn reaction system by Nakatani et al, 8 even though the technique has been studied for 18 years.…”