YU Dianying

Abstract: The determination of K₂O in raw materials for ceramic industry has been made by direct measurement with volinomycin potassium electrode as indicator electrode and calomel electrode as ref ere nee electrode. The multiple standard addition method was also used in the determination of K₂O for checking the results. It has been found that using MgCl₂ and NaAc -HAc as ionic strength and PH buffer, the test solution is (at PH4) clear and the potential is stable. To eliminate the interference from K⁺ the tests of conditions for determining Na₂O have been made, which shows that analytical values of Na₂O are always between Na₂O content of the test solution and Na₂O content of the fix 一position一solution, in the presence of the same quantity of K₂O in the fix—position一solution as the quantity in the test solution, Based on this fact, the analytical procedure of determining Na₂O has been worked out. As TISAB, the hydrochloric acid and triethanolamine were added to the solu一 tion, and the "multiple 一positioning 一and 一measuring" was then performed, and the satisfactory results of determining Na₂O were obtained.

Keywords: materials, ceramic