Skip to Content

Dear Customer:

The current international situation is complex and volatile, and uncertain tariff policies may potentially impact our product prices. Given these uncertainties, we value your understanding regarding order-related matters.

If you decide to place an order during this period, we reserve the right to adjust the price based on the evolving situation. We understand that market changes may cause inconvenience. We will negotiate with you if there’s a significant price fluctuation due to tariff policy changes before the order’s actual delivery, and in such cases we may adjust or cancel the order as necessary.

For important updates on recent policy changes, please click here for more details.

Merck
CN
All Photos(1)

Key Documents

View All Documentation

1.99002

Supelco

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

Sign Into View Organizational & Contract Pricing

Select a Size

30 X 30 ML
CN¥1,720.61

CN¥1,720.61

Estimated to ship onApril 22, 2025Details

Sign In for Best Price
Request a Bulk Order
All Photos(1)

Select a Size

Change View
30 X 30 ML
CN¥1,720.61

About This Item

UNSPSC Code:
12161706
NACRES:
NA.25

CN¥1,720.61

Estimated to ship onApril 22, 2025Details

Sign In for Best Price
Request a Bulk Order

grade

certified reference material

Quality Level

300

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

Related Categories

Compare Similar Items

View Full Comparison

Show Differences

1 of 4

This Item
199004109477199003
Buffer solution (potassium dihydrogen phosphate/di-sodium hydrogen phosphate), traceable to SRM from NIST and PTB pH 7.00 (25°C) Certipur®

199002

Buffer solution

Buffer solution (boric acid/potassium chloride/sodium hydroxide), traceable to SRM from NIST and PTB pH 10.00 (25°C) Certipur®

199004

Buffer solution

Buffer solution (di-sodium hydrogen phosphate/potassium dihydrogen phosphate), colour: green traceable to SRM from NIST and PTB pH 7.00 (20°C) Certipur®

109477

Buffer solution

Buffer solution (boric acid/potassium chloride/sodium hydroxide solution), traceable to SRM from NIST and PTB pH 9.00 (25°C) Certipur®

199003

Buffer solution

bp

109 °C/1013 hPa

bp

100 °C/1013 hPa

bp

-

bp

100 °C/1013 hPa

product line

Certipur®

product line

Certipur®

product line

Certipur®

product line

Certipur®

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
food and beverages
general analytical
industrial qc
pharmaceutical

application(s)

environmental
food and beverages
general analytical
industrial qc
pharmaceutical

application(s)

environmental
food and beverages
general analytical
industrial qc
pharmaceutical

application(s)

environmental
food and beverages
general analytical
industrial qc
pharmaceutical

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.

Application

The potassium dihydrogen phosphate/di-sodium 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.

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

recommended

Product No.
Description
Pricing

1.09407

Buffer solution, (potassium dihydrogen phosphate/disodium hydrogen phosphate)traceable to SRM from NIST and PTB pH 7.00 (25°C) Certipur®

1.09439

Buffer solution, (di-sodium hydrogen phosphate/potassium dihydrogen phosphate), traceable to SRM from NIST and PTB pH 7.00 (20°C) Certipur®

1.09477

Buffer solution, (di-sodium hydrogen phosphate/potassium dihydrogen phosphate), colour: green traceable to SRM from NIST and PTB pH 7.00 (20°C) Certipur®

1.99057

Buffer solution, (di-sodium hydrogen phosphate/potassium dihydrogen phosphate), colour:yellowtraceable to SRM from NIST and PTB pH 7.00 (25°C) Certipur®

1.99068

Buffer solution, di-sodium hydrogen phosphate/potassium dihydrogen phosphate, traceable to NIST, traceable to PTB, pH 6.86 (25 °C), Certipur®

Storage Class Code

12 - Non Combustible Liquids

WGK

nwg

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

    • Certificates of Analysis (COA)

    Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

    Select a Product Number

    Already Own This Product?

    Find documentation for the products that you have recently purchased in the Document Library.

    Visit the Document Library

    Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

    Contact Technical Service