To guarantee maximum traceability, an individual test certificate exists for every batch of buffer solutions. It can easily be downloaded and printed for documentation purposes.Download your certificate here
Compliance with GHS
Remaining compliant with regulations is important. All of our SDS (Safety Data Sheet) and labels contain information according to GHS (Global Harmonized System) in local languages.Download your SDS here
Discard Expired Buffer
The expiry date indicates until which date the certificate guarantees the value and the associated measurement uncertainty. After this date the uncertainty cannot be guaranteed.
Use a fresh aliquot of buffer for each calibration to ensure no contamination enters the bottle. Do not calibrate directly in the solution bottle.
Use enough buffer for accurate calibrations. The sensor should be submerged in the solution in order to achieve the most accurate results.
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How can I optimize the use of my pH buffers?
The quality of a solution is only guaranteed for unopened bottles that have not yet expired. The following tips will help optimize the use of pH buffer solutions after opening and while in use in the laboratory. Fresh calibration solutions minimize the measurement uncertainty and thus optimize the reproducibility of results:
- Note the date on the bottle when the pH buffer is opened for the first time.
- Keep the bottles sealed tightly at all times
- Never pour dispensed pH buffer solution back into the original bottle.
- Ensure that bottles containing are not contaminated.
- Replace pH buffer solutions that have reached the expiry date or may be contaminated.
Where can a certificate or a material safety data sheet for solutions be obtained?
What is the difference between Technical, NIST/DIN and Certified pH buffer solutions?
- Technical buffers:
This pH buffer solutions come with a certificate from METTLER TOLEDO. Precision is ± 0.02 pH units.
- NIST/DIN buffers:
Buffers prepared according to the recommendation of the National Institute of Standards and Technology (NIST) and the German Institute for Standardization (DIN). They also have a certificate from METTLER TOLEDO. Precision is ± 0.02 pH units.
- Certified buffers:
Selection of pH buffers that are verified and certified by an independent laboratory (DKD = Deutscher Kalibrierdienst = German Calibration Service). Precision is ± 0.02 pH units.
What are the tolerances of our pH buffers?
- DIN/NIST pH buffers ± 0.02 pH units
- DKD buffers ± 0.02 pH units
- Technical buffers ± 0.02 pH units
What calibration points should I use?
Calibration should cover the range of the desired measurement values. The most common pH sensor calibration method is two-point calibration.
Should pH buffer 7.00 be included in every calibration?
It is not necessary to include pH 7.00 for calibration according to the US and European pharmacopoeia (USP and EP, respectively). But if the calibration is done in compliance with the Japanese Pharmacopoeia (JP), then pH 6.86 buffer (phosphate) is mandatory. For calibration according to EP, only pH buffer 4.01 (phthalate) is compulsory.
If not working according to any regulation, the principle is easy: For calibration, only those buffers are needed which bracket the pH range of your samples. For example in a quality control where every sample should have pH between 3.5 and 3.8, a 2-point calibration with pH 2.00 and 4.01 is sufficient. There is no need for calibration with pH 7.00 in such a case.
Are all pH calibration buffers from METTLER TOLEDO NIST compliant?
All of our pH buffers are NIST traceable and hence NIST compliant. Please read the following citation of our calibration certificate:
- For the calibration of the pH value of our buffer solutions, the measuring instruments were calibrated using two different reference buffer solutions, based on primary pH reference materials of the NIST1.
- The National Metrology Institutes compare their measurement capabilities periodically in key comparisons within the CIPM-MRA2.
- The international comparability, harmonization and the equivalence of their measurement capabilities are therefore guaranteed.
- This ensures a flawless traceability of the certified pH buffer solution values to NIST along with our Quality Management System. The certification is done for each lot.