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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Acetic Acid, 10% v/v, 200.00 L DrumSKU: CA008900-200E-EAManufacturer: Reagents IncAcetic Acid, 10% v/v, 200.00 L Drum (1 per EA )Learn Morewas $1,740.00 Special Price $1,304.64 - Sodium Hydroxide, 0.04N / MeOH, 100.00 mL Poly naturalSKU: CS012700-100A-EAManufacturer: Reagents IncSodium Hydroxide, 0.04N / MeOH, 100.00 mL Poly natural (1 per EA )Learn Morewas $23.50 Special Price $17.28
- Nitric Acid, 0.6 N, 500.00 mL Poly naturalSKU: CN206600-500A-EAManufacturer: Reagents IncNitric Acid, 0.6 N, 500.00 mL Poly natural (1 per EA )Learn Morewas $91.00 Special Price $68.04
- Buffer, pH 1.68, 1.00 L Poly naturalSKU: C2115168-1A-EAManufacturer: Reagents IncBuffer, pH 1.68, 1.00 L Poly natural (1 per EA )Learn Morewas $49.00 Special Price $36.72
- Sodium Hydroxide, 50% w/w RGT, 500.00 mL Poly naturalSKU: C1318600-500A-EAManufacturer: Reagents IncSodium Hydroxide, 50% w/w RGT, 500.00 mL Poly natural (1 per EA )Learn Morewas $47.00 Special Price $35.64
- Sulfuric Acid, 25% v/v, 20.00 L Winpak blueSKU: C7306100-20E7-EAManufacturer: Reagents IncSulfuric Acid, 25% v/v, 20.00 L Winpak blue (1 per EA )Learn Morewas $332.00 Special Price $249.48
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Midget, Copper, 0.2-3.0 ppmSKU: 5119-EAManufacturer: Taylor TechnologiesMidget, Copper, 0.2-3.0 ppm (1 per EA )Learn Morewas $0.67 Special Price $0.59 -
Sodium Hydroxide TS 3 - 100mLSKU: TS14258-100ml-EAManufacturer: Dawn ScientificSodium Hydroxide TS 3 - 100mL (1 per EA )Learn Morewas $39.62 Special Price $38.63 - Slide, Nitrate, 0-10 ppmSKU: 5758-EAManufacturer: Taylor TechnologiesSlide, Nitrate, 0-10 ppm (1 per EA )Learn Morewas $0.91 Special Price $0.37
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Sulfuric Acid, 12.00 N Solution, 200L, CAS# 7664-93-9SKU: S1818-2.5LTGL-EAManufacturer: Spectrum ChemicalSulfuric Acid, 12.00 N 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 $162.85 Special Price $97.55 - Boric Acid, 2% w/v, 4.00 L Poly naturalSKU: CB112400-4A-EAManufacturer: Reagents IncBoric Acid, 2% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $109.00 Special Price $82.08
- Glycerol/Ethanol Solution, 4.00 L Poly naturalSKU: CG100000-4A-EAManufacturer: Reagents IncGlycerol/Ethanol Solution, 4.00 L Poly natural (1 per EA )Learn Morewas $135.00 Special Price $101.52
- Hydroxylamine HCl, 10% w/v, 500.00 mL Poly naturalSKU: CH145000-500A-EAManufacturer: Reagents IncHydroxylamine HCl, 10% w/v, 500.00 mL Poly natural (1 per EA )Learn Morewas $110.00 Special Price $82.08
- Barium Chloride, 10% w/v, 10.00 L CubitainerSKU: C7147020-10F-EAManufacturer: Reagents IncBarium Chloride, 10% w/v, 10.00 L Cubitainer (1 per EA )Learn Morewas $249.00 Special Price $186.84
- Sodium Chloride, 50 ppm, 1.00 L Poly naturalSKU: CS240000-1A-EAManufacturer: Reagents IncSodium Chloride, 50 ppm, 1.00 L Poly natural (1 per EA )Learn Morewas $113.00 Special Price $84.24
- EDTA Titrant, 0.025M (0.05N) U, 200.00 L DrumSKU: CE250500-200E-EAManufacturer: Reagents IncEDTA Titrant, 0.025M (0.05N) U, 200.00 L Drum (1 per EA )Learn Morewas $641.00 Special Price $480.60
- Triton X-100™ Wetting Agent, 250.00 mL Poly naturalSKU: C2342800-250A-EAManufacturer: Reagents IncTriton X-100™ Wetting Agent, 250.00 mL Poly natural (1 per EA )Learn Morewas $114.00 Special Price $85.32
- Acetic Acid / Chloroform 3:2, 4.00 L glass sc ambSKU: C7100640-4C1-EAManufacturer: Reagents IncAcetic Acid / Chloroform 3:2, 4.00 L glass sc amb (1 per EA )Learn Morewas $190.00 Special Price $142.56
- Cupric Citrate TS (Barfoed's Reagent) - 100mLSKU: TS14084-100ml-EAManufacturer: Dawn ScientificCupric Citrate TS (Barfoed's Reagent) - 100mL (1 per EA )Learn Morewas $54.62 Special Price $53.25
- S-Acetyl Coenzyme A Lithium Salt, 100mg, CAS# 75520-41-1SKU: A3132-100MG-EAManufacturer: Spectrum ChemicalS-Acetyl Coenzyme A Lithium Salt (1 per EA )Learn More$2,759.85
- Ethylenediaminetetraacetic Acid Tetrasodium Salt, Solution, 1LSKU: E1048-1LT-EAManufacturer: Spectrum ChemicalEthylenediaminetetraacetic Acid Tetrasodium Salt, Solution is typically known as EDTA and is an aminopolycarboxylic acid. It is usually used to dissolve limescale. 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$239.50
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Vario Ferro, F25 100 Pack, Ea/1SKU: 530570-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 85499. (1 per EA )Learn More$37.86 - Silver Nitrate, 0.153 N, 1.00 L Glass amberSKU: CS004000-1C-EAManufacturer: Reagents IncSilver Nitrate, 0.153 N, 1.00 L Glass amber (1 per EA )Learn Morewas $439.00 Special Price $329.40
- Buffer, pH 11.00, 20.00 L CubitainerSKU: C2156600-20F-EAManufacturer: Reagents IncBuffer, pH 11.00, 20.00 L Cubitainer (1 per EA )Learn Morewas $187.00 Special Price $140.40
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