pH Paper and Buffers
Thermo Scientific™ Orion™ pH Buffer Bottles
Perform accurate, reproducible pH calibrations with these color-coded buffer bottles.
pH 3.776 DIN 19266 Buffer Solution at 25°C, Reagecon
Tested, certified, NIST traceable, and shelf-stable buffer solution.
Lovibond™ PD250 Reagent Dispenser Refill: DPD Free Chlorine and Total Chlorine
For use with SC450 Chlorine and pH colorimeter, MC500 colorimeter and SP600 spectrophotometer
Alfa Aesar™ Maleate, 0.2M buffer soln., pH 7.0
CAS: 3105-55-3 Molecular Formula: C4H2NaO4 Molecular Weight (g/mol): 137.05 MDL Number: MFCD00070246 InChI Key: VRVKOZSIJXBAJG-ODZAUARKSA-L PubChem CID: 91658932 IUPAC Name: sodium (2Z)-but-2-enedioate SMILES: [Na+].[O-]C(=O)\C=C/C([O-])=O
Buffer, Precision Reference Standard, pH 10.000 (Color Coded Blue), Ricca Chemical
Standardized against NIST-certified pH references. High-Accuracy pH Buffer solutions are for use with meters with 0.001 resolution.
Thermo Scientific™ Orion™ pH Buffer Cubitainers™
Hold 5 gallons (19L) of pH buffer in color-coded Thermo Scientific™ Orion™ pH Buffer Cubitainers™ with easy-pour spigot.
Lovibond™ Powder Packs™ for Free Chlorine
Premeasured unit dose DPD reagents for water quality testing
Thermo Scientific™ Orion™ Pure Water™ pH Buffers and pHISA™ Adjustor
Sample well, rain, distilled/deionized, boiler feed and process waters with this adjustor.
Thermo Scientific™ Orion™ pH Buffer Individual Use Pouches
Ensure fresh, ready-to-use standards for pH calibration with these pH Buffer individual use pouches.
Traceable™ ISO Guide 34 Color-Coded CRM pH Buffers (Certified Reference Material), Fisherbrand™
Performs accurate, reproducible pH calibrations with color-coded bottles. Fisherbrand™ Traceable, Color-Coded buffers are Certified Reference Material pH Buffers.Compatible with all makes of pH instruments and electrodes.
ISE Reference Solutions, Fisherbrand™
ISE reference solution, ideal for use with robust, reliable refillable double junction ISE electrodes.
Alfa Aesar™ Glycylglycine, 0.2M buffer soln., pH 8.0
CAS: 556-50-3 Molecular Formula: C4H8N2O3 Molecular Weight (g/mol): 132.119 MDL Number: MFCD00008130 InChI Key: YMAWOPBAYDPSLA-UHFFFAOYSA-N PubChem CID: 11163 ChEBI: CHEBI:17201 IUPAC Name: 2-[(2-aminoacetyl)amino]acetic acid SMILES: C(C(=O)NCC(=O)O)N
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