Pflügers Archiv

, Volume 322, Issue 1, pp 39–46 | Cite as

Potassium in the rat kidney proximal tubules in situ: Determination by K+-selective liquid ion-exchange microelectrodes

  • R. N. Khuri
  • S. K. Agulian
  • W. M. Wise


Intraluminal K+ concentration in the rat kidney proximal tubule was measured in situ by means of K+-selective liquid ion-exchange microelectrodes. By virtue of its independence of sampling techniques, the in situ measurement is more accurate in dealing with fluids flowing through microtubular structures. Using K+-selective liquid ion-exchange microelectrodes it was observed that the K+ concentration falls along the length of the proximal convoluted tubule. The mean (TF/P) K concentration ratio of 0.89±0.01 for the first convolution is significantly greater (p<0.001) than the mean ratio of 0.81±0.01 for the last convolution of the proximal tubule. A description is given of the construction and calibration of the K+-selective microelectrode with a new liquid ion-exchanger.


Potassium Microelectrode Liquid Ion-Exchange Microelectrode Proximal Tubule Potassium 


Kalium-Mikroelektrode Flüssigkeits-Ionenaustausch-Mikroelektrode Kalium in proximalen Tubuli 


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Copyright information

© Springer-Verlag 1971

Authors and Affiliations

  • R. N. Khuri
    • 1
  • S. K. Agulian
    • 1
  • W. M. Wise
    • 1
    • 2
  1. 1.Department of PhysiologyAmerican University of BeirutBeirutRepublic of Lebanon
  2. 2.Research and Development LaboratoriesCorning Glass WorksCorningUSA

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