قیمت و خرید 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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بافر 4 مرک ,Buffer 4 solution

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بافر 4 مرک ,Buffer 4 solution

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عدد

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تومان

فروش محصولات مرک ، فروش محصولات سیکما ، آزمایشگاهی ، فروش ، شیمیایی ، دارویی ، غذایی ، داروسازی ، مرک ، سیگما ، آلدریچ ، فلوکا ، کارلو اربا ، CARLO ERBA ، کارلو ، اربا ، CARLO ، ERBA ، 109435 ، فروش بافر ، فروش بافر مرک ،

مشخصاتنمودار تغییر قیمتنظرات

مشخصات

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.

De script ion 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

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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):