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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Magnesium Sulfate, 27% w/v, 1.00 L Poly naturalSKU: CM002200-1A-EAManufacturer: Reagents IncMagnesium Sulfate, 27% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $241.00 Special Price $180.36 - Sod Tetraphenylboron, 0.005 M, 1.00 L Poly naturalSKU: CS155800-1A-EAManufacturer: Reagents IncSod Tetraphenylboron, 0.005 M, 1.00 L Poly natural (1 per EA )Learn Morewas $130.00 Special Price $97.20
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Sulfuric Acid TS - 100mLSKU: TS14285-100ml-EAManufacturer: Dawn ScientificSulfuric Acid TS - 100mL (1 per EA )Learn Morewas $39.62 Special Price $38.63 - Cupric Citrate TS 2, Alkaline - 100mLSKU: TS14086-100ml-EAManufacturer: Dawn ScientificCupric Citrate TS 2, Alkaline - 100mL (1 per EA )Learn Morewas $54.62 Special Price $53.25
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Ammonium Sulfide Solution, Reagent, ACS, 2.5L, CAS# 12135-76-1SKU: A1404-2.5LTPV-EAManufacturer: Spectrum ChemicalAmmonium Sulfide Solution, Reagent, ACS is an unstable salt with the formula (NH4)2S. Common uses of AMMONIUM SULFIDE are industrial applications including photo developing and textile manufacturing. As an ACS grade quality reagent, its chemical specifications are the de facto standards for chemicals used in many high-purity applications and typically designate the highest quality chemical available for laboratory use. Spectrum Chemical manufactured Reagent ACS grade products meet the toughest regulatory standards for quality and purity. (1 per EA )Learn Morewas $1,743.95 Special Price $1,032.04 - Sodium Lauryl Sulfate, 0.01 M, 4.00 L Glass amberSKU: CS115300-4C-EAManufacturer: Reagents IncSodium Lauryl Sulfate, 0.01 M, 4.00 L Glass amber (1 per EA )Learn Morewas $449.00 Special Price $336.96
- Sulfuric Acid, 32% w/w, 4.00 L Poly naturalSKU: CS102400-4A-EAManufacturer: Reagents IncSulfuric Acid, 32% w/w, 4.00 L Poly natural (1 per EA )Learn Morewas $196.00 Special Price $146.88
- Potassium Permanganate, 0.15 N, 1.00 L Glass amberSKU: CP208700-1C-EAManufacturer: Reagents IncPotassium Permanganate, 0.15 N, 1.00 L Glass amber (1 per EA )Learn Morewas $54.50 Special Price $41.04
- Sodium Hydroxide, 2.5 N, 4.00 L Poly naturalSKU: C7318260-4A-EAManufacturer: Reagents IncSodium Hydroxide, 2.5 N, 4.00 L Poly natural (1 per EA )Learn Morewas $102.00 Special Price $76.68
- Acetate Buffer - Plating, 1.00 L Poly naturalSKU: CA091400-1A-EAManufacturer: Reagents IncAcetate Buffer - Plating, 1.00 L Poly natural (1 per EA )Learn Morewas $49.00 Special Price $36.72
- Pot Iodide,10% w/v /0.3%NaHCO3, 4.00 L Glass amberSKU: C6317P00-4C-EAManufacturer: Reagents IncPot Iodide,10% w/v /0.3%NaHCO3, 4.00 L Glass amber (1 per EA )Learn Morewas $191.00 Special Price $143.64
- Persulfate Digesting Solution, 1.00 L Poly naturalSKU: CP206200-1A-EAManufacturer: Reagents IncPersulfate Digesting Solution, 1.00 L Poly natural (1 per EA )Learn Morewas $130.00 Special Price $97.20
- Acetic Acid, 10% w/w, 4.00 L Poly naturalSKU: CA203800-4A-EAManufacturer: Reagents IncAcetic Acid, 10% w/w, 4.00 L Poly natural (1 per EA )Learn Morewas $120.00 Special Price $89.64
- Sodium Acetate, 15% w/v, 20.00 L CubitainerSKU: C7306500-20F-EAManufacturer: Reagents IncSodium Acetate, 15% w/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $286.00 Special Price $214.92
- Potassium Dichromate, 0.1 N, 20.00 L CubitainerSKU: C7282530-20F-EAManufacturer: Reagents IncPotassium Dichromate, 0.1 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $430.00 Special Price $322.92
- Sulfuric Acid, 0.1142 N, 4.00 L Poly naturalSKU: CS100300-4A-EAManufacturer: Reagents IncSulfuric Acid, 0.1142 N, 4.00 L Poly natural (1 per EA )Learn Morewas $106.00 Special Price $79.92
- Buffer, pH 12.45, 20.00 L CubitainerSKU: C2156745-20F-EAManufacturer: Reagents IncBuffer, pH 12.45, 20.00 L Cubitainer (1 per EA )Learn Morewas $187.00 Special Price $140.40
- Diammonium Hyd Citrate, 15%w/w, 1.00 L Poly naturalSKU: CD001200-1A-EAManufacturer: Reagents IncDiammonium Hyd Citrate, 15%w/w, 1.00 L Poly natural (1 per EA )Learn Morewas $326.00 Special Price $244.08
- Acid Detergent Solution, 20.00 L CubitainerSKU: CA009900-20F-EAManufacturer: Reagents IncAcid Detergent Solution, 20.00 L Cubitainer (1 per EA )Learn Morewas $700.00 Special Price $524.88
- Potassium Fluoride, 40 Percent (w/v) Aqueous Solution, 1L, CAS# 7789-23-3SKU: P-335-1LT-EAManufacturer: Spectrum ChemicalPotassium Fluoride, 40 Percent (w/v) Aqueous 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 $219.80 Special Price $178.85
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Total Ionic Strength Adjustment Buffer C for Chloride/Bromide/Iodide/Copper Ion Electrodes (8 oz)SKU: AI4623-EAManufacturer: Apera InstrumentsTotal Ionic Strength Adjustment Buffer C for Chloride/Bromide/Iodide/Copper Ion Electrodes (8 oz) (1 per EA )Learn Morewas $35.00 Special Price $30.24 -
Vario Silica Hr Molybdate, F10 100 Pack, Ea/1SKU: 531720-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2107369. (1 per EA )Learn More$39.00 - Vario Iron Tptz, F10 100 Pack, Ea/1SKU: 530550-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2608799. (1 per EA )Learn More$44.10
- Acetate Buffer pH 4, 4.00 L Poly naturalSKU: CA002900-4A-EAManufacturer: Reagents IncAcetate Buffer pH 4, 4.00 L Poly natural (1 per EA )Learn Morewas $225.00 Special Price $168.48
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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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