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

• Published in: Analytical Sciences 2006, Vol.22(1), pp.117-121
• Main Authors: IKEDO, Mikaru, MORI, Masanobu, KURACHI, Kazumasa, HU, Wenzhi, TANAKA, Kazuhiko
• Format: Article
• Language: English
• Subjects: Aluminum Silicates - chemistry; Ceramics - chemistry; Chromatography, Ion Exchange - instrumentation; Chromatography, Ion Exchange - methods; Ions - analysis; Molybdenum - chemistry; Phosphates - analysis; Potassium Compounds - chemistry; Sensitivity and Specificity; Silicates - analysis; Soil Pollutants - analysis; Spectrophotometry, Ultraviolet - instrumentation; Spectrophotometry, Ultraviolet - methods; Time Factors; Trees; Water - chemistry; Wood
• ISSN: 0910-6340; 1348-2246
• DOI: 10.2116/analsci.22.117

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°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.