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A miniature electrolytic conductivity probe with a wide linear range

机译：线性范围宽的微型电导率探头

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摘要

A novel miniature electrolytic conductivity probe and its successful operation with modified bipolar pulse conductometry are presented. The probe based on a concentric ring-disk electrode configuration of less than 1 mm in diameter featured extremely small detection volume, and conductivity was measured with a 1 mu L solution. Rapid response, easy and quick washing, and virtually no consumption of samples by measurements were additional advantages of the suggested probe design. Poor linearity was observed with conventional AC conductometry due to a large cell constant and a small double layer capacitance of the probe. Measurement circuits for modified bipolar pulse conductometry were designed, and optimization of the various pulse parameters led to a wide linear dynamic range of 0.05-10 mS cm(-1), thus achieving high accuracy with a single-point calibration. The suggested conductometric device could be conveniently applied to biological reagents and samples that are usually too little to be measured with conventional conductometers.
机译：介绍了一种新颖的微型电解电导率探针及其在改进的双极脉冲电导仪上的成功应用。基于直径小于1 mm的同心环形圆盘电极结构的探针具有极小的检测体积，并且使用1μL溶液测量电导率。所建议的探头设计的其他优点是响应速度快，易于快速清洗，并且几乎不因测量而消耗样品。由于电池常数大和探针的双层电容小，常规交流电导率法观察到的线性差。设计了用于改进的双极型脉冲电导仪的测量电路，对各种脉冲参数的优化导致了0.05-10 mS cm（-1）的宽线性动态范围，从而通过单点校准实现了高精度。所建议的电导仪可以方便地应用于生物试剂和样品，这些样品通常太少而无法用常规电导仪测量。

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