menuordersearch
alfashimi.com

بافر 7 مرک, Buffer solution 7 , بافر 7 مرک, Buffer solution 7


بافر 7 مرک, Buffer solution 7
 Buffer solution 7(di-sodium hydrogen phosphate/potassium dihydrogen phosphate), traceable to SRM from NIST and PTB pH 7.00 (20°C) CertiPUR®فروش بافر 7
تصاویر
بیشتر
بافر 7 مرک, Buffer solution 7
(0)
(0)
بافر 7 مرک, Buffer solution 7
وضعیت کالا : موجود
مدل کالا
بافر 7 مرک, Buffer solution 7
تعداد عدد
قیمت کالا
تومان
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 registeredreferencematerialproducer 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/IEC 17025.

Description of CRM:

Buffer solution pH 10.00 (20°C)

Certified Reference Material for pH measurement

Ordering number:

1.09438.1000

Lot number:

example

Composition:

boric acid / potassium chloride / sodium hydroxide

Certified value and uncertainty

pH value 9.98 - 10.02 ± 0.03 (20°C)

pH value with expanded uncertainty UCRM

Method of Analysis:

pH value is measured with a combined glasselectrodeafter5-point calibration according to DIN 19268 with reference buffer solutions according toDIN19266,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 PTBandverified by SRMs fromNIST.

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 boric acid, potassium chloride, sodium hydroxide 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)

 

 

Application and correct use:    Thisreferencematerial is intended for use as a calibration standardfor

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.

 

Further information:

 

The combined standard uncertainty uCRMis obtained from the standard uncertainties of the characterisation, the homogeneityand the stability. uCharacterisation               is the uncertainty in accordance to DIN EN ISO/IEC 17025

which includes the contributions of the primaryreference 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 accordanceto ISO Guide 34.Thestability studies are the basis for the quantification of the minimum shelf life of this reference material for the unopened bottle.

 

Temperature dependence (example):

 

Temperature [°C]

∆pH

0

+ 0.26

5

+ 0.17

10

+ 0.11

15

+ 0.05

20

± 0

25

- 0.06

30

- 0.11

35

- 0.16

40

- 0.18

50

- 0.26

 

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

نمودار تغییر قیمت
دفتر مرکزی
تهران

تلفن های تماس
021-66979415
021-66979419
021-66431520
09122947401 : تلفن همراه
ALFAAZMA@GMAIL.COM
telegram