title: Selective and simultaneous determination of phosphate and silicate ions in leaching process waters for ceramics glaze raw materials of narutal origin by ion-exclusion chromatography coupled with UV-detection after postcolumn derivatization.
abstract: The selective and simultaneous ion-exclusion chromatography (IEC) with UV-detection on a weakly acidic cation-exchange resin column in the H+ -form (TSKgel Super IC-A/C) was developed and applied for the simultaneous determination of phosphate and silicate ions as the water quality parameters required for optimizing the water-leaching process for ceramics glaze raw materials of natural origin including feldspar, woods-ash, and straw-ash. Phosphate and silicate ions in these water-leaching process water samples were separated selectively from the coexisting anions such as sulfate, chloride, nitrate and carbonate ions, based on the ion-exclusion separation mechanism. They were detected selectively and simultaneously by a postcolumn derivatization with molybdenum-yellow using the UV-detector. Under the optimized separation and detection conditions (eluent, 0-1 mM sulfuric acid; reactant, 10 mM sodium molybdate-25 mM sulfuric acid; detector, UV at 370 nm; temperature, 45 degrees C), the linearity of calibration was in the range 0.1 - 10 ppm for both phosphate and silicate ions, and the detection limits at S/N = 3 were 2.58 ppb for silicate ions and 4.75 ppb for phosphate ions. The effectiveness of this method was demonstrated in practical applications to the water-leaching process for some ceramics glaze raw materials.
authors.affiliation: Graduate School of Engineering, Chubu University, 1200 Matsumoto, Kasugai 487-8501, Japan.
authors.forename: Mikaru
authors.initials: M
authors.lastname: Ikedo
authors.forename: Masanobu
authors.initials: M
authors.lastname: Mori
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Kurachi
authors.forename: Wenzhi
authors.initials: W
authors.lastname: Hu
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Tanaka
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D002516:Ceramics / Q000737:chemistry*; D002852:Chromatography, Ion Exchange / Q000295:instrumentation / Q000379:methods; D007477:Ions / Q000032:analysis; D008982:Molybdenum / Q000737:chemistry*; D010710:Phosphates / Q000032:analysis*; D017680:Potassium Compounds / Q000737:chemistry; D012680:Sensitivity and Specificity; D017640:Silicates / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D013056:Spectrophotometry, Ultraviolet / Q000295:instrumentation / Q000379:methods; D013997:Time Factors; D014197:Trees; D014867:Water / Q000737:chemistry; D014934:Wood
chemical_list: D000538:Aluminum Silicates; D007477:Ions; D010710:Phosphates; D017680:Potassium Compounds; D017640:Silicates; D012989:Soil Pollutants; D014867:Water; C016447:feldspar; D008982:Molybdenum