双冠醚钾电极的研究——Ⅱ.酮型、醇型和烃型双(4′-苯并-15-冠-5)为载体的钾离子选择电极

Studies on Potassium Ion-Selective Electrodes with Bis-Crown Ethers as Neutral Carrier——II. Response Performance of Potassium Electrodes Based on Alkanedioyl, Polymethylene and α, α'-Dihydroxypolymethylene Bis-Crown Ethers

一些酯型、醚型、Schiff硷型和亚苯基二氧亚甲基等桥联的双冠醚钾离子电极的响应特性已经报道。本文报道12种酮型、醇型和烃型双(4′-苯并-15-冠-5)PVC膜钾离子选择电极的性能。

PVC membrane K^+-selective electrodes based on 12 alkanedioyl, polymethylene and α, α'-dihydroxypolymethylene bis-crown ethers with 2-nitrophenyl-octylether as plasticizer were prepared and their characteristics were investigated. Response perfor- mance of these electrodes indicated that polymethylene and alkanedioyl with longer carbon chain bis (4'-benzo-15-crown-5)s (n≥7) are good for the neutral carrier of K^+- selective electrode. At 25℃, in pure KCl solution, the linear response ranges of these electrodes are from 2×10^(-5) to 10^(-1)mol·dm^(-3), K_(K^+,Na^+)^(pot)≤6×10^(-4) and K_(K^+,Ca^+)^(pot)～10^(-2). The response performance of the electrodes based on α, α'-dihydroxypolymethylene and alkanedioyl with shorter carbon cliain bis-crown ethers decreased with the lowering of the temperature of solution, the slopes are less than 50 mV/pK^+ at 15℃.