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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Iodide Iodate Reagent (25 mL sample, 1 drop = 2 ppm Na₂SO₃), 2 oz, Dropper BottleSKU: R-0808-C-EAManufacturer: Taylor TechnologiesIodide Iodate Reagent (25 mL sample, 1 drop = 2 ppm Na₂SO₃), 2 oz, Dropper Bottle (1 per EA)Learn Morewas $10.39 Special Price $7.93 -
Sodium Carbonate, 1% w/w, 500.00 mL Poly naturalSKU: CS122300-500A-EAManufacturer: Reagents IncSodium Carbonate, 1% w/w, 500.00 mL Poly natural (1 per EA )Learn Morewas $37.50 Special Price $28.08 -
Et 730 Portable Floc Tester 4 Positions, Ea/1SKU: 2419150-EAManufacturer: Lovibond Tintometer GroupThe ET 730 Floc Testing unit is ideal for small mobile laboratories or field applications. It has a small footprint with 4 stirring points arranged around a central lamp for easier viewing of the flocculation process. The unit can accommodate up to four (1 per EA)Learn More$2,645.80 -
Sodium Hydroxide, 1.00 N Solution, 1L, CAS# 1310-73-2SKU: S-370-1LT-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 1.00 N Solution is a standard solution of Caustic soda ideally suited for laboratory titrimetric techniques. You can rely on the quality of LabChem analytical test solutions for lot-to-lot reproducibility. (1 per EA )Learn Morewas $76.50 Special Price $62.24 -
Sodium Hydroxide, 50% w/v Solution, 3.8 L, Poly GallonSKU: S1171-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSodium Hydroxide, 50% w/v Solution, 3.8 L, Poly Gallon (1 per EA )Learn More$83.95 -
Ammonium Acetate Buffer-Iron, 4L, Poly BottleSKU: LC109704-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN2790 (1 per EA)Learn Morewas $274.80 Special Price $206.10 -
Sodium Hypochlorite, 5 Percent Available Chlorine, Solution, Reagent, 500mL, CAS# 7681-52-9SKU: S1315-500MLGL-EAManufacturer: Spectrum ChemicalSodium Hypochlorite, 5 Percent Available Chlorine, Solution, Reagent - The Reagent grade denotes that this chemical is the highest quality commercially available and that the American Chemical Society has not officially set any specifications for this material. Spectrum Chemical manufactured Reagent grade products meet the toughest regulatory standards for quality and purity. (1 per EA )Learn Morewas $141.80 Special Price $83.92 - Sodium Hydroxide, 30% w/w Solution, 1 LSKU: S1125-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsCaustic Soda (1 per EA)Learn More$32.35
- Reagent Alcohol 50% V/V (1+1), 4L, Poly BottleSKU: LC222204-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1987 (1 per EA)Learn Morewas $102.20 Special Price $76.65
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Copper Sulfate, 0.01M (0.01N), 1L, Poly BottleSKU: LC134422-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $40.00 Special Price $30.00 -
Sulfuric Acid Reagent, 16 ozSKU: R-0691-E-EAManufacturer: Taylor TechnologiesSulfuric Acid Reagent, 16 oz (1 per EA)Learn Morewas $65.73 Special Price $50.21 -
Hydrogen Peroxide, 3% w/w Solution, 3.8 LSKU: H1020-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsHydrogen Peroxide, 3% w/w Solution, 3.8 L (1 per EA)Learn More$42.25 -
Zinc Sulfate Solution, Specific Gravity 1.18 , 500 mL, CAS# 7446-20-0SKU: Z1000-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsZinc Sulfate Solution, Specific Gravity 1.18 , 500 mL, CAS# 7446-20-0 (1 per EA)Learn More$25.70 - Phosphoric Acid, 0.085% w/w in Acetonitrile, 4 L, Amber GlassSKU: P1153-4L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPhosphoric Acid, 0.085% w/w in Acetonitrile, 4 L, Amber Glass (1 per EA )Learn More$184.85
- Barium Chloride, 5% /0.5N HCl, 4.00 L Poly naturalSKU: CB002500-4A-EAManufacturer: Reagents IncBarium Chloride, 5% /0.5N HCl, 4.00 L Poly natural (1 per EA )Learn Morewas $98.00 Special Price $73.44
- Acetate Buffer - Plating 2X, 1.00 L Poly naturalSKU: CA091500-1A-EAManufacturer: Reagents IncAcetate Buffer - Plating 2X, 1.00 L Poly natural (1 per EA )Learn Morewas $140.00 Special Price $104.76
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Ferroin TS - 100mLSKU: TS14112-100ml-EAManufacturer: Dawn ScientificFerroin TS - 100mL (1 per EA )Learn Morewas $42.62 Special Price $41.56 - Formaldehyde Solution 30% - 1L (Pack of 4)Manufacturer: Dawn ScientificFormaldehyde Solution 30% - 1L (Pack of 4) (4 per PK )Learn Morewas $159.62 Special Price $155.63
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Glutaraldehyde, 24 Percent Aqueous Solution, 100mL, CAS# 56-85-9SKU: GL140-100ML-EAManufacturer: Spectrum ChemicalGlutaraldehyde, 24 Percent Aqueous Solution - Ungraded products supplied by Spectrum are indicative of a grade suitable for general industrial use or research purposes and typically are not suitable for human consumption or therapeutic use. (1 per EA )Learn More$107.10 -
Cobalt Nitrate 8% W/V, 125ML, Poly BottleSKU: LC132207-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $53.30 Special Price $39.97 -
Acetone-Alcohol, 1:1, 500ML, Poly BottleSKU: LC104401-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1993 (1 per EA)Learn Morewas $51.70 Special Price $38.77 - Alizarin Red S, 1% (Aq), 1L, Poly BottleSKU: LC106002-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $78.50 Special Price $58.87
- Sodium Carbonate 0.53% W/V, 1L, Poly BottleSKU: LC229752-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $42.70 Special Price $32.02
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Iodide Solution 2oz DBSKU: R-0772-C-EAManufacturer: Taylor TechnologiesIodide Solution 2oz DB (1 per EA)Learn Morewas $21.36 Special Price $16.32
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