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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Isopropyl Alcohol, 91% v/v, Technical, 5 gal, Poly Pail CAS# 67-63-0SKU: I1027-5gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsIsopropanol; 2-propanol (1 per EA)Learn More$95.90 -
Molybdate Reagent, galSKU: R-0601-G-EAManufacturer: Taylor TechnologiesMolybdate Reagent, gal (1 per EA )Learn Morewas $101.73 Special Price $91.01 -
Hydrogen Peroxide TS - 500mLSKU: TS14124-500ml-EAManufacturer: Dawn ScientificHydrogen Peroxide TS - 500mL (1 per EA )Learn Morewas $59.62 Special Price $58.13 -
Cresol Red Indicator, 16 ozSKU: R-1003K-E-EAManufacturer: Taylor TechnologiesCresol Red Indicator, 16 oz (1 per EA)Learn Morewas $42.16 Special Price $32.21 -
55 Gallon Yellow Buffer Solution pH 7.0 @ 25°CSKU: MSI-B2287-55GAL-EAManufacturer: Midland Scientific55 Gallon Yellow Buffer Solution pH 7.0 @ 25°C (1 per EA )Learn Morewas $988.05 Special Price $648.76 -
Stannous Chloride 40%, 125ML, Amber GlassSKU: LC252007-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1789 (1 per EA)Learn Morewas $78.00 Special Price $60.00 -
Aluminum Chloride, 0.1 Molar , 1 L, PolySKU: A1023-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAluminum Chloride, 0.1 Molar , 1 L, Poly (1 per EA)Learn More$22.10 -
NP-40 Lysis High Salt Buffer Solution, 250 Milliliters CAS# 1185-53-1, 7647-14-5, 6381-92-6, 9016-45-9SKU: N32000-250.0-EAManufacturer: Research Products InternationalDimensions: 3.38 x 4.63 x 3.38, Weight: 0.12, Cas#: 1185-53-1, 7647-14-5, 6381-92-6, 9016-45-9 Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$53.65 - Potassium Chlorate, 8% w/v Solution, 100 mL, Glass w/ DropperSKU: P1004-100mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSaturated Solution (1 per EA)Learn More$28.75
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Toluidine Blue O Indicator, 2 oz, Dropper BottleSKU: R-0881-C-EAManufacturer: Taylor TechnologiesToluidine Blue O Indicator, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $26.84 Special Price $20.50 - Hydrogen Peroxide, 25% w/w Solution, Technical, 5 galSKU: H1026-5gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsHydrogen Peroxide, 25% w/w Solution, Technical, 5 gal (1 per EA)Learn More$126.25
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Nitrification Inhibitor, 50ML 50 ML, Ea/1SKU: 2418642-EAManufacturer: Lovibond Tintometer GroupLovibond® Nitrification Inhibitor, 50ml (1 per EA)Learn More$38.80 -
Potassium Iodate, 0.05 M Solution, 1L, CAS# 7758-05-6SKU: P-276-1LT-EAManufacturer: Spectrum ChemicalPotassium Iodate, 0.05 M Solution is a chemical compound and oxidizing agent. 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 $139.85 Special Price $113.80 -
Potassium Iodide 5% W/V, 500ML, Amber PolySKU: LC197401-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $42.00 Special Price $31.50 -
Hydrogen Peroxide, 50 Percent, Solution, Reagent, 4L, CAS# 7722-84-1SKU: H1077-4LT-EAManufacturer: Spectrum ChemicalHydrogen Peroxide, 50 Percent, Solution, Reagent - 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 Morewas $1,387.05 Special Price $1,128.64 -
Sodium Hydroxide, 2.5N (2.5M), 500ML, Poly BottleSKU: LC244001-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $42.80 Special Price $32.93 - Starch 0.5% W/V W/Chloroform, 500ML, Poly BottleSKU: LC253051-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $44.40 Special Price $34.16
- Sodium Hydroxide, 12% w/w Solution, 55 gal, DrumSKU: S1218-55gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSodium Hydroxide, 12% w/w Solution, 55 gal, Drum (1 per EA )Learn More$981.50
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Potassium Permanganate 0.891G/L, 500ML, Amber GlassSKU: LC198601-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $37.20 Special Price $27.90 - Saline TS - 500mLSKU: TS14235-500ml-EAManufacturer: Dawn ScientificSaline TS - 500mL (1 per EA )Learn Morewas $89.62 Special Price $87.38
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Hydrochloric Acid 3N, 32 ozSKU: R-0737-F-EAManufacturer: Taylor TechnologiesHydrochloric Acid 3N, 32 oz (1 per EA)Learn Morewas $79.56 Special Price $60.78 - Ammonium Hydroxide 50% V/V (1+1), 500ML, Poly BottleSKU: LC111401-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2672 (1 per EA)Learn Morewas $60.70 Special Price $45.52
- Conditioning Reagent, 500ML, Poly BottleSKU: LC133201-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1789 (1 per EA)Learn Morewas $78.90 Special Price $59.17
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Acetate Buffer pH 4.5, 20.00 L CubitainerSKU: CA235000-20F-EAManufacturer: Reagents IncAcetate Buffer pH 4.5, 20.00 L Cubitainer (1 per EA )Learn Morewas $453.00 Special Price $348.50
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