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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Citric Acid, 10% w/v Solution, 1 L, PolySKU: C1123-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsCitric Acid, 10% w/v Solution, 1 L, Poly (1 per EA )Learn More$24.10 -
Copper Sulfate 2G/L, 500ML, Poly BottleSKU: LC134101-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $51.70 Special Price $38.77 -
Ammonium Hydroxide, 6.0 N Solution, 500mL, CAS# 1336-21-6SKU: A-540-500ML-EAManufacturer: Spectrum ChemicalAmmonium Hydroxide, 6.0 N Solution, is a solution of ammonia in water. Aqueous ammonia, as it's otherwise known is used as a complexant and base in qualitative inorganic analysis. It becomes a deep blue color with copper solutions. Used to dissolve silver oxide residues, such as the ones formed from Tollens' reagent, it is also commonly used in numerous cleaning agents, such as window cleaning formulas as well as a complexant that is manufactured to parts-per-billion trace impurities and has been used in the semiconductor industry to dissolve heavy or precious metal components. (1 per EA )Learn Morewas $222.65 Special Price $181.17 -
Sodium Thiosulfate, 0.1 %, 500.00 mL Poly naturalSKU: CS009700-500A-EAManufacturer: Reagents IncSodium Thiosulfate, 0.1 %, 500.00 mL Poly natural (1 per EA )Learn Morewas $19.50 Special Price $15.12 -
Red-Four(TM) Buffer Solution, pH 4.01 +/- 0.01 @ 25 DEG C, Color-coded RED, Reference StandardSKU: B1163-500MLPL-EAManufacturer: Spectrum ChemicalRed-Four (TM) Buffer Solution, pH 4.01 +/- 0.01 @ 25 DEG C, Color-coded RED, Reference Standard (1 per EA )Learn Morewas $61.80 Special Price $50.28 - Borax 1% W/V, 500ML, Poly BottleSKU: LC117101-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $60.50 Special Price $45.37
- Edta Titrant, 0.01M (0.02N), 500ML, Poly BottleSKU: LC138501-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $28.90 Special Price $21.68
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Silver Nitrate, 0.0282N (0.0282M), 500ML, Amber GlassSKU: LC226501-EAManufacturer: LabChemShelf Life (months): 18, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $82.70 Special Price $62.02 -
Ammonium Thiocyanate, 0.1N (0.1M), 1L, Poly BottleSKU: LC113702-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $54.40 Special Price $40.80 - Potassium Hydroxide, 30% w/v Solution, 1 L, PolySKU: CF1001-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Hydroxide, 30% w/v Solution, 1 L, Poly (1 per EA )Learn More$34.15
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Phenanthroline Reagent, 2 ozSKU: R-1306G-C-EAManufacturer: Taylor TechnologiesPhenanthroline Reagent, 2 oz (1 per EA)Learn Morewas $28.77 Special Price $21.97 -
Vario Ammonia Nitrogen Reagent Set, F10 100 Tests, Ea/1SKU: 535500-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2668000. Lovibond VARIO Ammonia Nitrogen Reagent Set, 100 Tests Includes: 531370, VARIO Ammonia Salicylate Reagent, F10 - 100 ct. 531380, VARIO Ammonia Cyanurate Reagent, F10 - 100 ct. (1 per EA)Learn More$161.00 -
Hydrogen Peroxide TS - 100mLSKU: TS14124-100ml-EAManufacturer: Dawn ScientificHydrogen Peroxide TS - 100mL (1 per EA )Learn Morewas $35.62 Special Price $34.73 - Benedict Qualitative Solution, 1L, Poly BottleSKU: LC116502-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $61.30 Special Price $45.98
- Sodium Chloride, 1% w/v Solution, 1 gal, PolySKU: S1052-1gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSodium Chloride, 1% w/v Solution, 1 gal, Poly (1 per EA)Learn More$23.00
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N-(1-NapHthyl)-Ethylenediamine Dihydrochloride 0.1%, 500ML, Amber PolySKU: LC175501-EAManufacturer: LabChemShelf Life (months): 2, , UN Number: (1 per EA)Learn Morewas $99.90 Special Price $74.93 -
Iodine, 0.01 N (0.005 M) Solution, 500mL, CAS# 7553-56-2SKU: I-091-500MLGL-EAManufacturer: Spectrum ChemicalIodine, 0.01 N (0.005 M) Solution (1 per EA )Learn Morewas $54.00 Special Price $43.93 -
Sodium Hydroxide, 5 Percent (w/v) Solution, 4L, CAS# 1310-73-2SKU: S-242-4LT-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 5 Percent (w/v) 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 $104.85 Special Price $85.32 -
Magnesium Chloride Reagent, 16 ozSKU: R-0755-E-EAManufacturer: Taylor TechnologiesMagnesium Chloride Reagent, 16 oz (1 per EA )Learn Morewas $35.08 Special Price $31.38 -
Silver Nitrate, 0.045N (0.045M), 4L, Amber PolySKU: LC226604-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $378.70 Special Price $284.03 - Lead Acetate, 5% w/v (50 g/L), 500.00 mL Glass amberSKU: CL157000-500C-EAManufacturer: Reagents IncLead Acetate, 5% w/v (50 g/L), 500.00 mL Glass amber (1 per EA )Learn Morewas $50.00 Special Price $37.80
- Sulfuric Acid, 5.0N (2.5M), 1L, Poly BottleSKU: LC258402-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $59.30 Special Price $45.62
- Sodium Azide 0.5% W/V, 500ML, Poly BottleSKU: LC229401-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $63.60 Special Price $47.70
- Sodium Carbonate 5% W/V, 1L, Poly BottleSKU: LC229702-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $56.10 Special Price $42.08
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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
BEAD BATH 20 L, 120 V, TYPE B PLUG, Liters/EA: 20
was $1,794.65 Special Price $1,714.78
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