For pH buffers, check the pH value and the temperature it is stated at (most here are specified at 25 °C), the tolerance, and whether the lot is traceable to a reference standard if your quality system requires it. Color-coded buffers, such as red for pH 4, yellow for pH 7 and blue for pH 10, help avoid mix-ups during calibration. Sizes run from 500 mL bottles to 4 L bottles and 10 L and 20 L Cubitainers, so buy a size you will use before the expiration date. Electrode storage solution, offered in several sizes, keeps pH electrodes ready between uses.
Buffers and Solutions: common questions
What is 1,10-phenanthroline used for?
1,10-Phenanthroline is an organic compound that forms an intensely colored orange-red complex with ferrous iron, which is the basis of a common colorimetric method for measuring iron in water and other samples. The iron complex, known as ferroin, is also used as a redox indicator in titrations. It is sold as the monohydrate or anhydrous form, so check which one your method calls for.
How long do pH buffer solutions last once opened?
An unopened buffer is good until the manufacturer's expiration date. Once opened, buffers can change as they absorb carbon dioxide from the air or become contaminated, and alkaline buffers such as pH 10 are affected most. Pour what you need into a clean container, never return used buffer to the bottle, keep it capped, and replace it if calibration results drift.
What is the difference between a buffer and a reagent?
A buffer is a solution that resists changes in pH when small amounts of acid or base are added, usually a weak acid or base mixed with its salt. A reagent is any substance used to cause or measure a chemical reaction. Buffers are a kind of reagent used to hold pH steady in analyses, biological work and instrument calibration.
Shop by type: pH Buffers · Blends
Top brands: Reagents Inc · LabChem · Spectrum Chemical
Popular Buffers and Solutions:
Buffers and Solutions
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Acid-Alcohol 3% V/V, 4L, Poly BottleSKU: LC105004-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2924 (1 per EA)Learn Morewas $201.10 Special Price $150.82 -
Acetic Acid 25% V/V (1+3), 1L, Poly BottleSKU: LC102402-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2790 (1 per EA)Learn Morewas $103.90 Special Price $77.92 -
Aluminum Chloride, 0.1 Molar , 3.8 L, Poly GallonSKU: A1023-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAluminum Chloride, 0.1 Molar , 3.8 L, Poly Gallon (1 per EA)Learn More$44.65 -
Synthetic Perspiration A, 100.00 mL Poly naturalSKU: CS500200-100A-EAManufacturer: Reagents IncSynthetic Perspiration A, 100.00 mL Poly natural (1 per EA )Learn Morewas $46.00 Special Price $34.56 -
Vario Molybdenum Hr 3, F25 100 Pack, Ea/1SKU: 530800-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 1417869. (1 per EA )Learn More$56.16 - EDTA Titrant, 0.01 M, with Mg, 4.00 L Poly naturalSKU: CE251600-4A-EAManufacturer: Reagents IncEDTA Titrant, 0.01 M, with Mg, 4.00 L Poly natural (1 per EA )Learn Morewas $143.00 Special Price $106.92
- Ferric Ammonium Sulfate, 2%, 4.00 L Glass amberSKU: CF129700-4C-EAManufacturer: Reagents IncFerric Ammonium Sulfate, 2%, 4.00 L Glass amber (1 per EA )Learn Morewas $62.00 Special Price $46.44
- Potassium Dichromate, 1 N, 4.00 L Poly naturalSKU: CP202100-4A-EAManufacturer: Reagents IncPotassium Dichromate, 1 N, 4.00 L Poly natural (1 per EA )Learn Morewas $142.00 Special Price $106.92
- Starch, 1%, Chloroform pres., 500.00 mL Poly naturalSKU: CS420900-500A-EAManufacturer: Reagents IncStarch, 1%, Chloroform pres., 500.00 mL Poly natural (1 per EA )Learn Morewas $47.50 Special Price $35.64
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Sulfate standard solution (10ppm) - 100mLSKU: TS14421-100ml-EAManufacturer: Dawn ScientificSulfate standard solution (10ppm) - 100mL (1 per EA )Learn Morewas $59.62 Special Price $58.13 -
Sulfuric Acid-Babcock, 2.5L, Clear GlassSKU: LC256503-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1830 (1 per EA)Learn Morewas $143.30 Special Price $110.24 -
Buffer Solution pH 7.4, 500ML, Poly BottleSKU: LC123901-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $36.00 Special Price $27.00 - Sodium Chloride 0.85% W/V, 500ML, Poly BottleSKU: LC234501-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $32.50 Special Price $24.38
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DipHenylamine 0.3% In 50% H2So4, 500ML, Amber GlassSKU: LC136401-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1830 (1 per EA)Learn Morewas $143.00 Special Price $107.25 - Silver Nitrate, 0.0141N (0.0141M), 500ML, Amber GlassSKU: LC226001-EAManufacturer: LabChemShelf Life (months): 18, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $57.00 Special Price $42.75
- Chlorophenol Red Indicator, 0.2% w/v in 0.1 N Sodium Hydroxide, 120 mL, Poly w/ FliptopSKU: CF1239-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsChlorophenol Red Indicator, 0.2% w/v in 0.1 N Sodium Hydroxide, 120 mL, Poly w/ Fliptop (1 per EA )Learn More$50.75
- TISAB II, for Fluoride ISE, 4.00 L Poly naturalSKU: C7340210-4A-EAManufacturer: Reagents IncTISAB II, for Fluoride ISE, 4.00 L Poly natural (1 per EA )Learn Morewas $182.00 Special Price $136.08
- Sodium Bicarbonate, Saturated, 4L, Poly BottleSKU: LC229474-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $88.10 Special Price $66.07
- O-pHenanthroline 0.3% W/V, 1L, Poly BottleSKU: LC181552-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $147.60 Special Price $110.70
- Alum Solution 10% W/V, 500ML, Poly BottleSKU: LC107401-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $86.70 Special Price $65.03
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PAA Reagent #4, 2 oz, Dropper BottleSKU: R-0928-C-EAManufacturer: Taylor TechnologiesPAA Reagent #4, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $19.36 Special Price $14.79 -
Iodide Iodate N/126, galSKU: R-0633-126-G-EAManufacturer: Taylor TechnologiesIodide Iodate N/126, gal (1 per EA)Learn Morewas $78.88 Special Price $60.25 -
Potassium Permanganate, 0.1 N Aqueous Solution, 4L, CAS# 7722-64-7SKU: P-445-4LTGL-EAManufacturer: Spectrum ChemicalPotassium Permanganate, 0.1 N Aqueous Solution - Spectrum solutions utilize the highest quality raw materials appropriate to your product. Most raw materials meet or exceed the specifications established by the American Chemical Society. Where appropriate, many finished products are traceable to NIST Standard Reference Materials. Manufacturing, quality control testing, and packaging are all performed in Spectrum’s own facilities. Record keeping and sample retention of all produced lots ensure product consistency and complete traceability. (1 per EA )Learn Morewas $155.55 Special Price $126.57 -
Formaldehyde, 37 Percent, Solution, 4L, CAS# 50-00-0SKU: F3328-4LT-EAManufacturer: Spectrum ChemicalFormaldehyde, 37 Percent, Solution is also known as methanal and is the simplest aldehyde. It has many uses, one of which is formol, the famous embalming and tissue preserving liquid. It is also used in industrial application for the production of different types of resins. It is also a well known tissue fixative and was formerly a disinfectant. (1 per EA )Learn Morewas $610.75 Special Price $451.79
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