黄酮类冠酸钾离子选择电极的研制及其对陶瓷原料含钾量的测定

PREPARATION OF THE FLAVONOID CROWN ETHER POTASSIUM ION - SELECTIVE ELECTRODES AND DETERMINATION OF POTASSUIM IN CERAMIC RAW MATERIALS USING THE ELECTRODES

黄酮类取代基能加强冠醚对钾离子的敏感性和络合选择性。本工作研制了以两种结构相似的黄酮类冠醚为电活性物质的钾离子选择电极，探讨了它们的响应功能及在测定陶瓷原料的应用。在ｐＨ＝６的酸度下，以乙酸锂为离子强度调节剂，按一次标准添加法和Ｇｒａｎ添加法进行分析处理，结果表明，该化学传感器应用于长石、高岭土等陶瓷原料中的氧化钾测定具有足够高的选择性和准确度。

Flavonoid as the substitute group, which strengthens ability of cmplexing potassium by the crown ether arid enhances potassium sensitivity of the crown ether. The two potassium ion - selective electrodes have been prepared in our work. Each of the two mambrane contions respectively little different in chemical structure flavanoid crown ether as the electroactive component. The response functions have been determined. Use of analysis for ceramic raw materials has been investigated. With lithium acetate as the ion strength adjust, at PH = 6, determination of K,O in ceramic mate'rinls, such as fieldspare and kaolin, has been carried out by single and Gran addition method. The data show that the chemical sensors, applying to analysis of above ceramic materials, have a fairly good precision and selectivity.