PERFORMANCE TESTS FOR THE MEASUREMENT OF PH WITH GLASS ELECTRODES IN LOW IONIC-STRENGTH SOLUTIONS INCLUDING NATURAL-WATERS
PERFORMANCE TESTS FOR THE MEASUREMENT OF PH WITH GLASS ELECTRODES IN LOW IONIC-STRENGTH SOLUTIONS INCLUDING NATURAL-WATERS
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DOI：
10.1021/ac00290a031
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发表时间：
1985-01-01
影响因子：
7.4
通讯作者：
WOOF, C
中科院分区：
文献类型：
--
作者：
DAVISON, W;WOOF, C
不同的商业参比电极的性能，用于测量低离子强度的天然沃茨的pH值，已被测试对可再生的自由扩散结。对合成溶液的比较测量在预测性能方面部分成功。在稀释缓冲液、稀释酸和蒸馏水中测定的误差与在天然沃茨中观察到的误差相似，但在MBS缓冲液中的响应未能揭示任何问题。不良电极降低pH值从它的真实值，更多的是在搅拌父亲比静止的解决方案。在最稀的溶液中，对于最差的电极，搅拌时pH的变化最大。更好的电极的特征在于通过接合处的内部填充溶液的高流速。由于没有一种试验能保证电极的性能，建议采用标准的参考程序来测试电极。使用普通电极和已建立的程序来测量低离子强度淡水的pH值并不能保证准确度（1-6）。误差的主要来源与参比电极的液体接界有关。在建立定义明确的pH值标度时非常小心。如果用电池1进行测量
The performance of different commercial reference electrodes, used to measure the pH of low Ionic strength natural waters, has been tested against a renewable free diffusion Junction. Comparative measurements on synthetic solutions were partially successful In predicting performance. Errors determined In dilute buffers, dilute acids, and distilled water were similar to those observed In natural waters, but the response In MBS buffers failed to reveal any problems. Poor electrodes depressed the pH from Its true value, more so In stirred father than quiescent solutions. The shift In pH upon stirring was largest for the worst electrodes In the most dilute solutions. Better electrodes were characterized byhigh flow rates of Internal filling solution through the Junction. As no one test could guarantee electrode performance, the adoption of a standard reference procedure to test electrodes was rec-ommended.Use of normal electrodes and established procedures for the measurement of the pH of low ionic strength freshwaters does not guarantee the accuracy (1-6). The prime source of error is associated with the liquid junction of the reference electrode. Great care has been taken in establishing well-defined pH scales. If measurements are made with cell 1