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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Sodium Thiosulfate, 0.1 Normal, 1 L, Amber PolySKU: S1039-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/10 (0.1 M) (1 per EA)Learn More$23.25 -
Boric Acid 2% W/V, 1L, Poly BottleSKU: LC117202-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $61.50 Special Price $46.13 -
Conductivity Neutralizing Solution, 16 ozSKU: R-7022-E-EAManufacturer: Taylor TechnologiesConductivity Neutralizing Solution, 16 oz (1 per EA)Learn Morewas $26.93 Special Price $20.57 - Sulfuric Acid 16.7% V/V (1:5), 1L, Poly BottleSKU: LC256052-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $50.70 Special Price $39.01
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Formaldehyde 10% V/V Buffered, 20L, Cubitainer®SKU: LC146705-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $249.00 Special Price $186.75 -
55 Gallon Red Buffer Solution pH 4.0 @ 25°C,SKU: MSI-B2283-55GAL-EAManufacturer: Midland Scientific55 Gallon Red Buffer Solution pH 4.0 @ 25°C, (1 per EA )Learn Morewas $988.05 Special Price $648.76 -
Murexide Indicator, 0.2 Percent (w/w) in Sodium Chloride, Powder Mixture, For Calcium, APHA, 500g, CAS# 128446-36-6SKU: M-280-100GM-EAManufacturer: Spectrum ChemicalMurexide Indicator, 0.2 Percent (w/w) in Sodium Chloride, Powder Mixture, For Calcium, APHA is used as a colorimetric reagent for the measurement of rare earth metals and of calcium. As an APHA certified solution, this item meets the ASTM D1209 standards and can be used in water and waste water treatment facilities to determine the concentration of dissolved and particulate materials. Spectrum Chemical manufactured APHA grade products meet the toughest regulatory standards for quality and purity. (1 per EA )Learn Morewas $175.00 Special Price $157.25 -
Silica Reagent #1, 32 ozSKU: R-1306T-F-EAManufacturer: Taylor TechnologiesSilica Reagent #1, 32 oz (1 per EA)Learn Morewas $56.77 Special Price $43.36 -
Aluminum Chloride Solution, 500ML, Poly BottleSKU: LC108201-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN2581 (1 per EA)Learn Morewas $276.40 Special Price $207.30 -
Barium Chloride Solution 10%, 32 ozSKU: R-0646-F-EAManufacturer: Taylor TechnologiesBarium Chloride Solution 10%, 32 oz (1 per EA)Learn Morewas $33.29 Special Price $25.43 -
Copper Sulfate, 2% w/v, 1.00 L Poly naturalSKU: CC030000-1A-EAManufacturer: Reagents IncCopper Sulfate, 2% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $32.00 Special Price $23.76 - Sodium Thiocyanate, 0.1N (0.1M), 1L, Poly BottleSKU: LC249702-EAManufacturer: LabChemShelf Life (months): 4, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $69.80 Special Price $53.70
- Boric Acid, 2% w/v pH 4.65, 20.00 L CubitainerSKU: CB110600-20F-EAManufacturer: Reagents IncBoric Acid, 2% w/v pH 4.65, 20.00 L Cubitainer (1 per EA )Learn Morewas $244.00 Special Price $182.52
- Arsenic Trioxide Stock (JP), 1.00 L Glass amberSKU: CA205400-1C-EAManufacturer: Reagents IncArsenic Trioxide Stock (JP), 1.00 L Glass amber (1 per EA )Learn Morewas $264.00 Special Price $197.64
- Acetate Buffer pH 5.5, For Arsenic, 1L, Poly BottleSKU: LC100052-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $84.70 Special Price $63.53
- Methylene Blue, 1% w/v Solution, 940 mLSKU: M1019-940mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsMethylene Blue, 1% w/v Solution, 940 mL (1 per EA)Learn More$21.30
- Sodium Hydroxide, 6.25 N, 500.00 mL Poly naturalSKU: CS166100-500A-EAManufacturer: Reagents IncSodium Hydroxide, 6.25 N, 500.00 mL Poly natural (1 per EA )Learn Morewas $42.50 Special Price $32.40
- Sodium Hydroxide, 0.4N (0.4M), 20L, Cubitainer®SKU: LC243205-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $245.50 Special Price $188.87
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Ferrous Ammonium Sulfate Solution, 1L, Amber GlassSKU: LC145452-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: UN3264 (1 per EA)Learn Morewas $120.10 Special Price $90.07 - Hydrochloric Acid, 0.1N (0.1M), 20L, Cubitainer®SKU: LC152205-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $213.00 Special Price $159.75
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Copper Buffer, .75 oz, Dropper BottleSKU: R-0642-A-EAManufacturer: Taylor TechnologiesCopper Buffer, .75 oz, Dropper Bottle (1 per EA)Learn Morewas $14.82 Special Price $11.32 - Acidic Titration Solvent ASTM, 4.00 L Poly naturalSKU: CA302800-4A-EAManufacturer: Reagents IncAcidic Titration Solvent ASTM, 4.00 L Poly natural (1 per EA )Learn Morewas $220.00 Special Price $165.24
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Buffer Solution pH 12.45, 4L, Poly BottleSKU: LC125624-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $96.80 Special Price $72.60 -
Yellow-Seven(TM) Buffer Solution, pH 7.00 (+/-0.01 @ 25 DEG C), Color-coded Yellow, Reference StandardSKU: B1168-4LTPL-EAManufacturer: Spectrum ChemicalYellow-Seven (TM) Buffer Solution, pH 7.00 (+/-0.01 @ 25 DEG C), Color-coded Yellow, Reference Standard is an inorganic solution in water. 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 $138.60 Special Price $112.77
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BEAD BATH 20 L, 120 V, TYPE B PLUG, Liters/EA: 20
was $1,794.65 Special Price $1,714.78
LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
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