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بافر 4 مرک ,Buffer 4 solution , بافر 4 مرک ,Buffer 4 solution


بافر 4 مرک ,Buffer 4 solution
4 Buffer solution (citric acid/sodium hydroxide/hydrogen chloride), traceable to SRM from NIST and PTB pH 4.00 (20°C) CertiPUR®فروش بافر مرک
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بافر 4 مرک ,Buffer 4 solution
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Specification

Certipur® Certified Reference Material   

Producer:

Merck KGaA, Frankfurter Str. 250, 64293 Darmstadt, Germany.

Accreditation:

 

Merck KGaA, Darmstadt, Germany is accredited by the German

 

accreditation authority DAkkS as registered reference material producer D-RM-15185-01-00 in accordance with ISO Guide 34 and registered calibration laboratory D-K-15185-01-00 according to DIN EN ISO/IEC17025.

 

 

Description of CRM:

Buffer solution pH 4.00 (20°C)

 

Certified Reference Material for pH measurement

Ordering number:

1.09435.1000

Lot number:

example

Composition:

citric acid / sodium hydroxide / hydrogen chloride

Certified value and uncertainty

pH value 3.99 – 4.01 ± 0.02 (20°C)

 

pH value with expanded uncertainty UCRM

Method of Analysis:

pH value is measured with a combined glass electrode after 5-point

 

calibration according to DIN 19268 with reference buffer solutions

 

according to DIN 19266, IUPAC, NIST, Ph.Eur. and USP.

Traceability:

The pH value of this certified buffer solution is directly traceable to

 

primary certified reference materials characterised by PTB and verified

 

by SRMs from NIST.

 

NIST 189x, 188x, 185x, 186 Ix, 186 IIx, 187x

 

PTB OX-xxx/xx, TA-xxx/xx, PHT-xxx/xx, PHO-xxx/xx, BO-xxx/xx

 

PTB: Physikalisch Technische Bundesanstalt, Braunschweig, Germany

 

NIST: National Institute of Standards and Technology, Gaithersburg, USA.

Preparation:

This reference material is prepared gravimetrically from citric acid,

 

sodium hydroxide, hydrogen chloride and high purity water.

Storage:

Store at +15°C to +25°C tightly closed in the original container.

 

 

 

Minimum shelf life:                         3 years

 

 

 

 

 

 

 

 

 

(Laboratory manager)

 

 

 

 

1.09435.1000

HCxxxxxxx

page 1/2

 

Application and correct use:   This reference material is intended for use as a calibration standard for pH instruments or pH electrodes or as a control sample for measuring the pH value. The pH value is strongly dependent on the temperature. It is therefore necessary to keep the temperature constant within the measurement. Details concerning the nature of any hazard and appropriate precautions to be taken are provided in the material safety data sheet.

 

Expanded uncertainty UCRM:      The expanded uncertainty UCRM is calculated as UCRM = k ·uCRM, where k = 2 is the coverage factor for a 95% coverage probability and uCRM is the combined standard uncertainty in accordance to ISO Guide 34.

 

 

 

 

The combined standard uncertainty uCRM is obtained from the standard uncertainties of the characterisation, the homogeneity and the stability. uCharacterisationis the uncertainty in accordance to DIN EN ISO/IEC 17025

 

which includes the contributions of the primary reference material and the measuring system.

 

 

uHomogeneity

 

 

is the between-bottle variation in accordance to

ISO Guide 34. The assessment of homogeneity is performed

by analysis of a representative number of systematically

chosen sample units

 

 

uStability

 

 

is the uncertainty obtained from short-term and long-term stability in accordance to ISO Guide 34. The stability studies are the basis for the quantification of the minimum shelf life of this reference material for the unopened bottle.

 

 

Further information:

 

Temperature dependence (example):

 

Temperature

∆pH

[°C]

 

 

 

0

+ 0.05

5

+ 0.04

10

+ 0.02

15

+ 0.01

20

± 0

25

+ 0.01

30

+ 0.01

35

+ 0.01

40

+ 0.01

50

± 0

 

For more detailed information please read the certification report on www.merckmillipore.com

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.09435.1000

HCxxxxxxx

page 2/2

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