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本文报导了咳平电极的制备,比较了不同离子载体和溶剂介体的电极性能。电极的线性范围为5.1×10~(-5)—3.2×10~(-2)M,斜率可达55mV/pC。测定了电极在不同介质中的响应,选择拧檬酸体系作为该电极的离子强度缓冲剂。测试了电极对一些常见无机和有机物质的电位选择性系数,表明了电极有较强的抗干扰能力。电极的其它性能亦好。用该电极测定咳平原料中咳平的含量,所得结果与药典法相符。
This paper reports the preparation of cough flat electrodes and compares the electrode properties of different ionophore and solvent mediators. The linear range of the electrode is 5.1 × 10 ~ (-5) -3.2 × 10 ~ (-2) M and the slope is up to 55mV / pC. The response of the electrode in different media was measured and the citric acid system was chosen as the ionic strength buffer for the electrode. The electrode potential selectivity of some common inorganic and organic materials was tested, indicating that the electrode has a strong anti-interference ability. The other performance of the electrode is also good. The electrode was used to determine the cough flat content of cough level, the results obtained consistent with the pharmacopoeia.