Should the IntelliCAL™ ISENH3181 Ammonia Ion Selective Electrode (ISE) be stored in Ammonia Storage Solution or 1000 mg/L NH3-N Standard?

Document ID

Document ID TE2678

Version

Version 3.0

Status

Status Published

Published Date

Published Date 07/17/2018
Question
Should the IntelliCAL™ ISENH3181 Ammonia Ion Selective Electrode (ISE) be stored in Ammonia Storage Solution or 1000 mg/L NH3-N Standard?
Summary
Storage of IntelliCAL™ Ammonia ISE probe
Answer
For short-term storage, it is currently recommended to store the Ammonia ISE in 1000 mg/L NH 3 -N Standard, without Ionic Strength Adjustor (ISA), instead of the Ammonia Storage Solution. Measurement error and drift is lessened when stored in the 1000 mg/L standard.

For long term storage (over one week of disuse), remove the membrane (this can be allowed to dry), rinse the electrode, and store the electrode in pH Electrode Storage Solution (Product # 2756549).

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