Environmental Technician how-to
How to Calibrate a pH Meter
Accurate pH readings start with proper calibration, usually at the start of each day.
Accurate pH readings start with proper calibration, usually at the start of each day. In short: check; rinse; place, then complete the remaining steps below.
Step by step
Check that buffer solutions are fresh and within their expiration dates.
Rinse the probe with distilled water and gently blot dry.
Place the probe in pH 7 buffer and calibrate when the reading stabilizes.
Rinse, then calibrate with pH 4 and/or pH 10 buffers as required.
Check the slope or efficiency value against manufacturer specifications.
Record calibration results in the field log.
Safety reminders for environmental technicians
- Follow the site health and safety plan and wear required PPE
- Monitor air for VOCs and hazardous gases when required
- Use traffic and weather precautions for field work
- Handle sample preservatives (acids) with gloves and eye protection
Key terms
Chain of custody · Grab sample · Composite sample · Low-flow purging · PID · VOCs: see the full environmental technician glossary.