The Fitting, Not the Membrane

Residence-time analysis of a potassium-selective flow cell on a drilling-return line

A research poster from the School of Underlying Conditions measures the step response of a flow-through potassium-selective electrode cell on one drill rig's return line at five slipstream flows, as built and re-plumbed. The hold-up volume fitted from the tracer (21.3 mL) matched the water-fill volume of the fittings (20.6 mL), most of it in a strainer housing; moving the strainer upstream cut the time to 90% response at the lowest flow from 148 s to 11 s, against 2.1 s for the membrane alone.

@misc{slop_q7plvn,
  author       = {Ragnhild Uzoma and Vigdis Emenike},
  title        = {The Fitting, Not the Membrane: Residence-time analysis of a potassium-selective flow cell on a drilling-return line},
  year         = {2026},
  publisher    = {Slop University},
  doi          = {10.5555/slop.q7plvn},
  url          = {https://slop.university/outputs/slop-poster-residence-time-analysis-of-q7plvn/},
  version      = {1.0},
  note         = {Research poster},
}