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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TRIS-BORATE-EDTA, 10X SOLUTION, 4 LITER CUBITAINERSKU: T32024-4000.0-EAManufacturer: Research Products InternationalDimensions: 7.50 x 7.50 x 7.50 Weight: 11 - Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$169.70 -
SSC BUFFER, 20X SOLUTION, 4 LITERSKU: S24022-4000.0-EAManufacturer: Research Products InternationalDimensions: 7.00 x 10.50 x 4.50 Weight: 10.6 - Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$140.50 -
Alkaline-Iodide-Azide, Pomeroy, 4.00 L Poly naturalSKU: CA014600-4A-EAManufacturer: Reagents IncAlkaline-Iodide-Azide, Pomeroy, 4.00 L Poly natural (1 per EA )Learn Morewas $1,420.00 Special Price $1,092.42 - Xylene Cyanole Ind. 0.005%, 500.00 mL Glass amberSKU: CX000500-500C-EAManufacturer: Reagents IncXylene Cyanole Ind. 0.005%, 500.00 mL Glass amber (1 per EA )Learn Morewas $28.50 Special Price $21.92
- TFA/Methylene Chloride, 25/75, 500.00 mL Glass amberSKU: CT154500-500C-EAManufacturer: Reagents IncTFA/Methylene Chloride, 25/75, 500.00 mL Glass amber (1 per EA )Learn Morewas $152.00 Special Price $116.94
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Carboxymethylcellulose Sodium, Medium Viscosity, Viscosity of 2 Percent Aqueous Solution @ 25 DEG C: 400-800 cP, USP4-32-4SKU: CA192-45KGBL-EAManufacturer: Spectrum ChemicalCarboxymethylcellulose Sodium, Medium Viscosity, Viscosity of 2 Percent Aqueous Solution @ 25 DEG C: 400-800 cP, USP is often used as a thickener and stabilizer. All Spectrum Chemical USP grade products are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP). (1 per EA )Learn More$6,857.10 -
55 Gallon Red Buffer Solution pH 4.0 @ 25°CSKU: MSIB2283-55GAL-EAManufacturer: Midland Scientific55 Gallon Red Buffer Solution pH 4.0 @ 25°C (1 per EA )Learn Morewas $2,276.45 Special Price $906.98 -
Md 110 Cod Vario Range: 0 - 15,000 Mg/L, Ea/1SKU: 2961202-EAManufacturer: Lovibond Tintometer GroupMd 110 Cod Vario Range: 0 - 15,000 Mg/L, Ea/1 (1 per EA )Learn More$844.80 -
D-Gluconic Acid, 50 Percent Aqueous Solution, 20L, CAS# 526-95-4SKU: GL105-20LT-EAManufacturer: Spectrum ChemicalD-Gluconic Acid, 50 Percent Aqueous Solution, also known as Dextronic acid, is considered a gluconate and can be used to treat burns from hydrofluoric acid. 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 $716.95 Special Price $424.28 -
Sodium Hydroxide 1% W/V, 4L, Poly BottleSKU: LC240004-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $106.40 Special Price $81.86 -
EDTA Disodium, 0.0575 M Solution, 500mL, CAS# 6381-92-6SKU: E-115-500MLPL-CSManufacturer: Spectrum ChemicalEDTA Disodium, 0.0575 M 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. (6 per CS )Learn Morewas $322.80 Special Price $262.67 -
Tclp Extraction Fluid #2, 4L, Amber GlassSKU: LC259974-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $95.00 Special Price $73.09 -
Universal Indicator, 1L, Amber PolySKU: LC265002-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1993 (1 per EA)Learn Morewas $220.10 Special Price $169.32 - Sodium Hydroxide, 0.4N (0.4M), 4L, Poly BottleSKU: LC243204-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $104.40 Special Price $80.32
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EDTA Disodium, 0.05 M Solution, 4L, CAS# 6381-92-6SKU: E-112-4LTPL-CSManufacturer: Spectrum ChemicalEDTA Disodium, 0.05 M Solution is also referred to as Ethylenediaminetetraacetic acid. The EDTA is extremely good at binding metals. This property is useful in complexometric titrations for the determination of metal levels. (4 per CS )Learn Morewas $582.15 Special Price $473.69 -
Sodium Hydroxide, 0.01N (0.01M) In Meoh, 1L, Poly BottleSKU: LC245202-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: UN1993 (1 per EA)Learn Morewas $61.60 Special Price $47.39 - Sodium Hypochlorite, 12.5%, 15.00 gal DrumSKU: C2319050-15E-EAManufacturer: Reagents IncSodium Hypochlorite, 12.5%, 15.00 gal Drum (1 per EA )Learn Morewas $795.00 Special Price $596.16
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Sodium Hydroxide, 5.0N (5.0M), 20L, Cubitainer®SKU: LC244505-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $512.40 Special Price $394.20 -
Sodium Hydroxide, 0.02N (0.02M), 500ML, Poly BottleSKU: LC242201-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $29.70 Special Price $22.85 - Starch 1.0% W/V W/Chloroform, 1L, Poly BottleSKU: LC253152-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $65.40 Special Price $50.31
- Sulfuric Acid, 12.0N (6.0M), 500ML, Poly BottleSKU: LC258801-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $70.00 Special Price $53.86
- Sulfuric Acid, 0.5N (0.25M), 20L, Cubitainer®SKU: LC257405-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $215.60 Special Price $165.86
- D-Gluconic Acid, 50 Percent Aqueous Solution, 4L, CAS# 526-95-4SKU: GL105-4LT-EAManufacturer: Spectrum ChemicalD-Gluconic Acid, 50 Percent Aqueous Solution, also known as Dextronic acid, is considered a gluconate and can be used to treat burns from hydrofluoric acid. 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 $258.85 Special Price $153.19
- Sodium Hydroxide, 2.0N (2.0M), 20L, Cubitainer®SKU: LC243805-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $421.10 Special Price $323.95
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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
4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
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