The physicochemical quality reproduced by the standard is the value of molecular activity of hydrogen ions expressed by its pH exponent. 
The certified pH value is traceable to the N.I.S.T. and the national pH measurement standard.

The pH value of standards depends on temperature and the values are shown in the certificate of the standard example.
pH standards examples are distributed in 100 cm3 bottles and 250 cm3 bottles.

pH standards evaluate the pH scale and they are designed for the standardisation of pH-meters and to check the accuracy of pH-electrodes.

pehametryczne


pH STANDARDS LIST

LP

Type No. 

Standard name

pH Value 
(25 °C)

Expanded Uncertainty (k=2)   

1.

BLS 099.010

TETRO-XALATE

1,68

0,01

2.

BLS 099.030

CITRATE

3,78

0,01

3.

BLS 099.040

PHTHALATE

4,01

0,01

4.

BLS 099.060

PHOSPHATE
(1:1)

6,86

0,01

5.

BLS 099.070

PHOSPHATE
(1:1.37)

7,00

0,01

6.

BLS 099.071

PHOSPHATE
(1:3.5)

7,41

0,01

7.

BLS 099.090

BORATE

9,18

0,02

8.

BLS 099.100

CARBONATE

10,01

0,02

9.

BLS 099.120

CALCIUMATE

12,4

0,1

The value reproduced by the pH-benchmarks was referenced to the international standard N.I.S.T. and to the state template pH unit. The template certificate confirming its metrological properties, including PCA accreditation marks, together with the reference to the PCA status as a signatory to the multilateral agreements of EA MLA and ILAC MRA regarding the mutual recognition of certificates, is issued for the manufactured pH-meters.

CALIBRATION LABORATORY ACCREDITED by Polish Centre for Accreditation, a signatory to EA MLA and ILAC MRA that include recognition of calibration certificates. The laboratory meets the requirements of standard PN-EN ISO/IEC 17025.

 

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