pH Paper and Buffers
Thermo Scientific™ Orion™ pH Buffer Bottles
Perform accurate, reproducible pH calibrations with these color-coded buffer bottles.
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 concentrate, pH 1.00, hydrochloric acid / potassium chloride, Honeywell Fluka™
for 500 ml buffer solution, hydrochloric acid / potassium chloride
Buffer solution pH 3.0 (20°C), Citric acid / sodium hydroxide / sodium chloride solution, with fungicide, traceable to SRM from NIST and PTB, Honeywell Fluka™
Citric acid / sodium hydroxide / sodium chloride solution, with fungicide, traceable to SRM from NIST and PTB
Cytiva Whatman™ pH Indicator Papers, CF Strips
Provides an extremely clear and accurate visual pH value using four different segments of dye-impregnated indicator papers. Whatman™ pH Indicator Papers, CF Strips use dyes that are chemically bonded to the paper and cannot be leached into solution.
Thermo Scientific™ Orion™ ROSS™ All-in-One™ pH Buffer Kit
Maintain pH electrodes more effectively with Thermo Scientific™ Orion™ ROSS™ All-in-One™ pH Buffer Kits.
Lovibond™ PD250 Reagent Dispenser Refill: DPD Free Chlorine and Total Chlorine
For use with SC450 Chlorine and pH colorimeter, MC500 colorimeter and SP600 spectrophotometer
Thermo Scientific™ Orion™ Standard All-in-One™ pH Buffer Kit
Work with ease using this color-coded pH buffer kit that includes three buffers, storage solution and a storage bottle.
Maleate, 0.2M buffer soln., pH 5.5, Thermo Scientific™
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;(Z)-4-hydroxy-4-oxobut-2-enoate;trihydrate SMILES: [Na+].[O-]C(=O)\C=C/C([O-])=O
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