Post on 12-Jun-2020
Buffer Quality Control Certificate
For the calibration of the value of our buffer or electrolyte solutions, the potentiometric measuring instruments were calibrated using one or two different reference buffer or electrolyte solutions, based on primary reference materials of the NIST2
The National Metrology Institutes compare their measurement capabilities periodically in key comparisons within the "Mutual Recognition Arrangement of National Measurement Standards and of Calibration Certificates issued by National Metrology Institutes (CIPM-MRA)". The international comparability, harmonization and the equivalence of their measurement capabilities are therefore ensured.This guarantees a flawless traceability of the certified pH buffer values to NIST along with our Quality Management System. The certification is done for each lot.
pH Buffer Solution
Actual pH Value
12
Date of Certificate Issue
Nominal Specifications
Buffer Properties
Traceability
51300193, 51300194, 51340230
The expanded uncertainty (k = 2) of the measurement is 0,02 pHNational Institute of Standards and Technology, Geithersburg, USA
Buffer pH 9.21
January 16, 2010
January 16, 2008
di-Sodium tetraborate decahydrate
9.22
1T016A
Secondary pH Reference Material
191-I-C
10.012 +/- 0.006 (25°C)
Quality Control
Order number
Procedure
Buffer Substances
Lot No. Solution
Expiry DateProduction Date
Two point calibration
Alfons Meier
January 16, 2008
Lot No SRM (NIST) 191-II-C
NIST Standard solution value 9.182 +/- 0.005 (25°C)
187d
Sodium Carbonate Sodium Bicarbonate Sodium Tetraborat
Decahydrate (Borax)
1