PASCO Specialty & Mfg. CI-6734 User Manual download pdf (Page 18)

Sodium Ion Selective Electrode 012–06615A

Symptom Possible Causes Next Step

Noisy or Unstable electrode exposed to interferences soak overnight in electrode storage solution

Readings (readings

continuously or rapidly defective electrode replace electrode

changing)

ISA not used use recommended ISA

stirrer not grounded ground stirrer

Drift (reading slowly samples and standards at different allow solutions to come to room temperature

changing in one direction) temperatures before measurement

electrode exposed to interferences soak overnight in electrode storage solution

incorrect reference filling solution use recommended filling solution

pH too acidic adjust pH with ISA

ISA not used use recommended ISA

Low Slope or No Slope standards contaminated or prepare fresh standards

incorrectly made

standard used as ISA use ISA

electrode exposed to interferences soak overnight in electrode storage solution

pH too acidic adjust pH with ISA

air bubble on membrane remove bubble by re-dipping probe

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PASCO Specialty & Mfg. CI-6734 User Manual Page 18