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以缬氨霉钾电极作指示电极,甘汞电极作参比电极,用直读法测定了陶瓷原材中的K_2O。为了比较K_2O的测定结束,也应用了多次标准添加法。发现:当以M Cl_2和NaAc—HAc作为离子强度和PH缓冲剂时(PH=4),试液清晰,电位稳定。为了消除K~+对Na_2O测定的干扰,进行了测定条件的试验。实验表明:当定位液中存在与试液相同K_2O量时,测定值总是介于试液中Na_2O含量和定位液中Na_2O含量之间。根据这一事实制定了测定Na_2O的分析手续。以盐酸、三乙醇氨作为总离子强度调节剂,通过“逼近定位”操作,得到了满意的Na_2O测定结果。
Potassium valinum potassium electrode as the indicator electrode, calomel electrode as the reference electrode, measured by direct reading method K2O ceramic raw materials. In order to compare the conclusion of K 2 O, several standard addition methods have also been applied. It was found that when M Cl 2 and NaAc-HAc were used as ionic strength and pH buffer (pH = 4), the test solution was clear and the potential was stable. In order to eliminate the interference of K ~ + on the determination of Na_2O, the conditions of the test were tested. Experiments show that: when the positioning fluid with the same K_2O test solution, the measured value is always between the test solution Na_2O content and the positioning solution of Na_2O content. Based on this fact, the analytical procedure for the determination of Na 2 O was established. Hydrochloric acid, triethanolamine as the total ionic strength regulator, through the “close to the positioning” operation, obtained satisfactory results Na2O.