分析化学2011，Vol.39Issue(4)：568-571,4.DOI:10.3724/SP.J.1096.2011.00568
毛细管电泳-非接触式电导法直接测定偏硅酸
Determination of Silicate by Capillary Electrophoresis with Contactless Conductivity Detection
摘要
Abstract
A new method for the rapid separation and sensitive determination of silicate in drinking natural mineral water by capillary electrophoresis with capacitively coupled contactless conductivity detection (CE-C4D) was developed. The analyte could be separated well within 6 min in a fused-silica capillary under the optimum conditions: 2.4 mmol/L KOH+1.6 mmol/L K2HPO4+0.4 mmol/L CTMAB as the running buffer, CTMAB as the electroosmotic flow modificator, negative polarity separation voltage, -15 kV. The linear response ranged from 2.0 mg/L to 80 mg/L with the LOD=0.5 mg/L. The relative standard deviations of the intra- and inter-day precision were 3. 5％ and 3.8％, respectively. The effects of the component of the running buffer, the interference of PO(34)- and colorants in samples were discussed. Contents of silicate in drinking natural mineral water samples could be easily determined by the proposed method with satisfactory results. It was free from phosphate and colorants interference.关键词
偏硅酸/毛细管电泳/非接触式电导/有色基体/饮用矿泉水Key words
Silicate/ Capillary electrophoresis/ Contactless conductivity detection/ Coloured matrix/Drinking natural mineral water引用本文复制引用
李二庭,杨丽蓉,黄文惠,王鑫,谢天尧..毛细管电泳-非接触式电导法直接测定偏硅酸[J].分析化学,2011,39(4):568-571,4.基金项目
本文系国家基金委人才培养基金(No.J0730420)和中山大学化学学院"开放实验室"基金资助项目 （No.J0730420）
