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在使用离子选择性电极检测未知溶液的浓度(活度)时,为了避免饱和氯化钾甘汞电极中高浓度的氯离子和钾离子干扰被测元素,常采用(U 形玻璃管也可用塑料管)琼脂盐桥来跨接测试电极和参比电极以满足测试要求。但 U 形玻璃管(或塑料管)盐桥,制作手续麻烦,使用不便,所消耗的琼脂量较多,又因琼脂胶与电磁搅拌下的被测溶液接触面较大,容易发生溶解和产生空隙,这既增大了电阻又藏留样品溶液,影响测定。鉴于上述情况,我们将直径与双液接甘汞电极外套管近似的滴管(也可用玻璃管或塑料管拉制成滴管状。若用5毫升离心管将下端磨出一与甘汞电极下端
In the use of ion-selective electrode detection of unknown solution concentration (activity), in order to avoid high concentrations of chloride and chloride amalgam chloride chloride ions and potassium ions interfere with the measured element, often used (U-shaped glass tube can also be plastic tube ) Agar bridge to span the test and reference electrodes to meet the test requirements. However, U-shaped glass tube (or plastic tube) salt bridge, the production process of trouble, inconvenient to use, the amount of agar consumed more, because agar and electromagnetic stirring under the test solution larger contact surface, prone to dissolution and produce Voids, which increase both the resistance and the sample solution, affect the determination. In view of the above, we will be diameter and double calomel electrode outer tube similar to the dropper (glass tube or plastic tube can also be drawn into a drop tube .If the 5ml centrifuge tube will be worn out a lower end of the calomel electrode