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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Potassium Iodate, 0.5168 N, 1.00 L Glass amberSKU: CP002700-1C-EAManufacturer: Reagents IncPotassium Iodate, 0.5168 N, 1.00 L Glass amber (1 per EA )Learn Morewas $134.00 Special Price $100.44 - Ferrous Amm Sulfate, 22 g/L Fe, 1.00 L Glass amberSKU: CF131300-1C-EAManufacturer: Reagents IncFerrous Amm Sulfate, 22 g/L Fe, 1.00 L Glass amber (1 per EA )Learn Morewas $58.00 Special Price $43.20
- Sodium Persulfate, 1 M, 20.00 L Winpak blueSKU: CS132200-20E7-EAManufacturer: Reagents IncSodium Persulfate, 1 M, 20.00 L Winpak blue (1 per EA )Learn Morewas $296.00 Special Price $222.48
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Iodine, Diluted TS - 100mLSKU: TS14132-100ml-EAManufacturer: Dawn ScientificIodine, Diluted TS - 100mL (1 per EA )Learn Morewas $39.62 Special Price $38.63 - Cobaltous Chloride TS - 100mLSKU: TS14075-100ml-EAManufacturer: Dawn ScientificCobaltous Chloride TS - 100mL (1 per EA )Learn Morewas $64.62 Special Price $63.01
- Acetic Acid 33% v/v, 20.00 L CubitainerSKU: CA204500-20F-EAManufacturer: Reagents IncAcetic Acid 33% v/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $506.00 Special Price $379.08
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Methylene Blue, 1 Percent (w/v) Aqueous Solution, 1L, CAS# 144-23-0SKU: M-204-125ML-EAManufacturer: Spectrum ChemicalMethylene Blue, 1 Percent (w/v) Aqueous Solution (1 per EA )Learn Morewas $31.90 Special Price $26.27 - Potassium Hydroxide, 45 Percent (w/w) Aqueous Solution, Reagent, 20L, CAS# 1310-58-3SKU: P1320-20LT-EAManufacturer: Spectrum ChemicalPotassium Hydroxide, 45 Percent (w/w) Aqueous Solution, Reagent is an aqueous solution of Caustic Potash and is the protypical strong base. Its reagent grade means this is the highest quality commercially available for this chemical and that the American Chemical Society has not officially set any specifications for this material. (1 per EA )Learn Morewas $1,527.50 Special Price $903.95
- Potassium Hydroxide, SVS Concentrate, To Prepare 1.0 N Solution, 1UNIT, CAS# 1310-58-3SKU: SV165-1UNIT-CSManufacturer: Spectrum ChemicalPotassium Hydroxide, SVS Concentrate, To Prepare 1.0 N Solution (6 per CS )Learn More$384.95
- Sulfuric Acid, SVS Concentrate, To Prepare 0.5 N Solution, 1UNIT, CAS# 7664-93-9SKU: SV290-1UNIT-CSManufacturer: Spectrum ChemicalSulfuric Acid, SVS Concentrate, To Prepare 0.5 N Solution - Spectrum's Standard Volumetric Solution (SVS) concentrate when diluted to 1 liter will yield a 0.5 N solution. Simply dilute the desired Standard Volumetric Solution concentrate to the specified volume (carefully following instructions provided with the package) and the resulting solution will have an exact Normality within 0.1%. Spectrum Standard Volumetric Solution concentrates are relied upon for fast, accurate results in life sciences and pharmaceutical quality control applications. (6 per CS )Learn More$320.10
- EDTA Disodium, 0.0575 M Solution, 200L, CAS# 6381-92-6SKU: E-115-200LTBL-EAManufacturer: 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. (1 per EA )Learn More$2,902.35
- Phosphoric Acid, 55% v/v, 20.00 L CubitainerSKU: CP003400-20F-EAManufacturer: Reagents IncPhosphoric Acid, 55% v/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $669.00 Special Price $502.20
- Calcium Hydroxide TS, 4.00 L Poly naturalSKU: CC002200-4A-EAManufacturer: Reagents IncCalcium Hydroxide TS, 4.00 L Poly natural (1 per EA )Learn Morewas $272.00 Special Price $204.12
- Mercuric Chloride, Saturated, 4.00 L Glass amberSKU: CM102400-4C-EAManufacturer: Reagents IncMercuric Chloride, Saturated, 4.00 L Glass amber (1 per EA )Learn Morewas $309.00 Special Price $232.20
- Ammonium Hydroxide, 50% v/v, 20.00 L Winpak blueSKU: CA100200-20E7-EAManufacturer: Reagents IncAmmonium Hydroxide, 50% v/v, 20.00 L Winpak blue (1 per EA )Learn Morewas $471.00 Special Price $353.16
- Copper Sulfate, 0.338 M, 500.00 mL Poly naturalSKU: CC201600-500A-EAManufacturer: Reagents IncCopper Sulfate, 0.338 M, 500.00 mL Poly natural (1 per EA )Learn Morewas $100.00 Special Price $74.52
- Potassium Iodide, 2.46 N, 20.00 L CubitainerSKU: CP100900-20F-EAManufacturer: Reagents IncPotassium Iodide, 2.46 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $2,890.00 Special Price $2,167.56
- Pot Bromate-Bromide, 0.5 N, 4.00 L Glass amberSKU: CP100200-4C-EAManufacturer: Reagents IncPot Bromate-Bromide, 0.5 N, 4.00 L Glass amber (1 per EA )Learn Morewas $275.00 Special Price $206.28
- Ammonium Acetate, 20% w/v, 4.00 L Poly naturalSKU: CA000500-4A-EAManufacturer: Reagents IncAmmonium Acetate, 20% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $248.00 Special Price $185.76
- Potassium Iodide, 10% w/v, 4.00 L glass sc ambSKU: CP114600-4C1-EAManufacturer: Reagents IncPotassium Iodide, 10% w/v, 4.00 L glass sc amb (1 per EA )Learn Morewas $213.00 Special Price $159.84
- Borate Buffer, pH 9.5, 4.00 L CubitainerSKU: CB009500-4F-EAManufacturer: Reagents IncBorate Buffer, pH 9.5, 4.00 L Cubitainer (1 per EA )Learn Morewas $209.00 Special Price $156.60
- Diphenylamine, 1% w/v, 120.00 mL Poly naturalSKU: CD001900-120A-EAManufacturer: Reagents IncDiphenylamine, 1% w/v, 120.00 mL Poly natural (1 per EA )Learn Morewas $82.00 Special Price $61.56
- Copper Sulfate, 10% w/v, 1.00 L Poly naturalSKU: CC102500-1A-EAManufacturer: Reagents IncCopper Sulfate, 10% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $71.50 Special Price $54.00
- Phenolphthalein, 1% /50% IPA, 500.00 mL Poly naturalSKU: CI161800-500A-EAManufacturer: Reagents IncPhenolphthalein, 1% /50% IPA, 500.00 mL Poly natural (1 per EA )Learn Morewas $57.00 Special Price $43.20
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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
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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