The pH specification for this product is certified to fall between 6.99 and 7.01. Precision must be measured using the specific instrument. The pH value is determined with a combined glass electrode after 5-point calibration according to DIN 19268, utilizing reference buffer solutions in accordance with DIN 19266, IUPAC, NIST, Ph.Eur., and USP.
1.99002
Buffer solution
(potassium dihydrogen phosphate/di-sodium hydrogen phosphate), traceable to SRM from NIST and PTB pH 7.00 (25°C) Certipur®
Synonym(s):
Potassium dihydrogen phosphate/di-sodium hydrogen phosphate buffer solution
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| Size/SKU | Availability | Price |
|---|---|---|
30 x 30 mL | Estimated to ship TODAY | $158.00 |
About This Item
NACRES:
NA.25
UNSPSC Code:
12161706
grade
certified reference material
Quality Segment
product line
Certipur®
pH
7.0 (25 °C in H2O)
bp
109 °C/1013 hPa
mp
-5 °C
density
1.01 g/cm3 at 20 °C
application(s)
environmental
food and beverages
general analytical
industrial qc
pharmaceutical
format
mixture
storage temp.
15-25°C
General description
The potassium dihydrogen phosphate/disodium hydrogen phosphate certified buffer solution is gravimetrically prepared using high-quality reagents and water at a registered calibration laboratory. Its pH value of 7.00 at 25°C is measured using a combined glass electrode following a 5-point calibration method. The measurement is made following DIN 19268 using reference buffer solutions compliant to DIN 19266, NIST, IUPAC, Ph. Eur, and USP. The buffer’s pH value is strongly dependent on the temperature and therefore a constant temperature must be maintained during its use.
Please visit ISO certificates and Site Quality Self-Assessments to access the current certificates of accreditation.
Download your certificate at http://www.sigma-aldrich.com to view certified values, including uncertainty and expiry date.
Please visit ISO certificates and Site Quality Self-Assessments to access the current certificates of accreditation.
Download your certificate at http://www.sigma-aldrich.com to view certified values, including uncertainty and expiry date.
Application
The buffer is used as a standard to calibrate pH measuringinstruments or pH electrodes and as a control to measure the pH of othersolutions.
Features and Benefits
- Measured and qualified at an ISO/IEC 17025 and ISO 17034 accredited laboratory
- Traceable to secondary reference standard from NIST and primary certified reference standard from PTB
- Ready-to-use solution available in 30 mL sachets
- Accompanied with a detailed and batch-specific certificate of analysis (CoA) for an effective audit
- Product label follows the ISO Guide 31 and contains information about ordering number, article description, lot number, safety data, and expiry date
- Packaging material subjected to comprehensive stability studies as per ISO Guide 35
Legal Information
CERTIPUR is a registered trademark of Merck KGaA, Darmstadt, Germany
1 of 1
This Item | |||
|---|---|---|---|
| description (potassium dihydrogen phosphate/di-sodium hydrogen phosphate), traceable to SRM from NIST and PTB pH 7.00 (25°C) Certipur® | description (boric acid/potassium chloride/sodium hydroxide), traceable to SRM from NIST and PTB pH 10.00 (25°C) Certipur® | description (di-sodium hydrogen phosphate/potassium dihydrogen phosphate), colour: green traceable to SRM from NIST and PTB pH 7.00 (20°C) Certipur® | description (boric acid/potassium chloride/sodium hydroxide solution), traceable to SRM from NIST and PTB pH 9.00 (25°C) Certipur® |
| format mixture | format mixture | format mixture | format mixture |
| product line Certipur® | product line Certipur® | product line Certipur® | product line Certipur® |
| bp 109 °C/1013 hPa | bp 100 °C/1013 hPa | bp - | bp 100 °C/1013 hPa |
| mp -5 °C | mp - | mp - | mp - |
| grade certified reference material | grade certified reference material | grade certified reference material | grade certified reference material |
| application(s) environmental | application(s) environmental | application(s) environmental | application(s) environmental |
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Storage Class
12 - Non Combustible Liquids
flash_point_f
Not applicable
flash_point_c
Not applicable
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Hello, what is the precision of the pH buffer Certipur? Are they compliant to Chinese Pharmacopeia chapter 0631? Thank you very much in advance for support. Best regards. Niels
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