pH Paper and Buffers
Standard Buffer Solutions, WTW™
As a standard buffering solution, this buffer pH 9.180 (PL 7) is available in a 250 ml bottle.
Standard Buffer Solution pH 4.01, WTW™
With a high accuracy: ±0.02 pH, this standard buffering solution is traceably certified to PTB/NIST and therefore safe for use.
Technical pH Buffer Solutions, METTLER TOLEDO™
Provides a reliable all-around pH buffer. Mettler Toledo™ Technical pH Buffer Solution are specified to two decimal places and are traceable to NIST standards. Color-coded solution comes in a handy 250mL plastic bottle with no-fuss labels.
Buffer Solution pH 4, Scharlab
Synonym: Potassium hydrogen phthalate buffer
Thermo Scientific™ Orion™ pH Buffer Bottles
Perform accurate, reproducible pH calibrations with these color-coded buffer bottles.
Phosphate Buffer Solution, pH 7, Honeywell™ Fluka™
CAS: 7732-18-5
Buffer Solution pH 7.0 (20°C), Potassium Dihydrogen Phosphate / Disodium Hydrogen Phosphate, Traceable to SRM from NIST, with Fungicide, Honeywell Fluka™
CAS: 1336-21-6 Molecular Formula: H5NO Molecular Weight (g/mol): 35.05 InChI Key: VHUUQVKOLVNVRT-UHFFFAOYSA-N PubChem CID: 14923 ChEBI: CHEBI:18219 SMILES: N.O
Thermo Scientific™ Orion™ Pure Water™ pH Buffers and pHISA™ Adjustor
Sample well, rain, distilled/deionized, boiler feed and process waters with this adjustor.
LaMotte™ Insta-Test™ Single and Multi-Factor Test Strips
For water quality testing
Electrolytes and Cleaning Solutions, WTW™
Used as refill solutions for liquid filled electrodes as well as a storage solution for all types of pH electrodes, these electrolytes and cleaning solutions are ideal for operating, storing, and cleaning electrodes.
pH papers, pH strips, pH sticks and pH test kits are used in laboratory, industrial and educational environments to qualitatively assess pH levels or monitor acid-base titrations in a range of sample types. pH buffer reference standards are used for the accurate calibration of pH meters and monitors for far more precise and quantitative pH measurement.
pH test papers are supplied either as rolls, tear-off strips, or sticks. They are impregnated with indicator dyes which change colour when dipped into the solution under test. In some products, the indicator dyes are covalently linked to the cellulose fibres to avoid bleed-out (leaching) and contamination of the test samples.
Some pH papers indicate simple acid or base conditions with a single red-blue colour change (also called litmus papers). Universal pH papers and strips contain a mix of indicator dyes which cover a range of pH values up to and including 0 to 14 in a single test. The observed colour change is checked against a comparison chart normally supplied with the papers.
Alternatively, for accurate assessment of pH, standard (reference) pH buffers are manufactured to very high degrees of precision and are used for the quantitative calibration of pH meters, electrodes and other electrochemical sensors. Standard buffers are:
- Typically supplied at fixed values of pH4.01, pH7.00 and pH10.01
- May be colour-coded for easy and quick identification
- Certified to their nominal pH and accuracy at a specified temperature (typically 20°C)
- Supplied as ready-to-use solutions or concentrates
- Contain antifungals for extended shelf life