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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Hydrogen Peroxide, 35% w/w, 4.00 L Poly naturalSKU: CH302000-4A-EAManufacturer: Reagents IncHydrogen Peroxide, 35% w/w, 4.00 L Poly natural (1 per EA )Learn Morewas $176.00 Special Price $131.76 - Villella's Etch, 1% / Ethanol, 500.00 mL Glass amberSKU: CV200200-500C-EAManufacturer: Reagents IncVillella's Etch, 1% / Ethanol, 500.00 mL Glass amber (1 per EA )Learn Morewas $128.00 Special Price $98.47
- ZoBell's Solution, ORP Std, 1.00 L Amber polySKU: CZ000100-1B-EAManufacturer: Reagents IncZoBell's Solution, ORP Std, 1.00 L Amber poly (1 per EA )Learn Morewas $105.00 Special Price $80.78
- Sodium Lauryl Sulfate, 0.004 N, 4.00 L Poly naturalSKU: CS115100-4A-EAManufacturer: Reagents IncSodium Lauryl Sulfate, 0.004 N, 4.00 L Poly natural (1 per EA )Learn Morewas $376.00 Special Price $281.88
- Sulfuric Acid, 0.005 N, HPLC, 4.00 L Glass amberSKU: CS020100-4C-EAManufacturer: Reagents IncSulfuric Acid, 0.005 N, HPLC, 4.00 L Glass amber (1 per EA )Learn Morewas $85.00 Special Price $63.72
- Potassium Hydroxide, 10% w/v, 500.00 mL Poly naturalSKU: CP116000-500A-EAManufacturer: Reagents IncPotassium Hydroxide, 10% w/v, 500.00 mL Poly natural (1 per EA )Learn Morewas $36.00 Special Price $27.00
- Murakami Reagent (Etchant), 500.00 mL Poly naturalSKU: CM140000-500A-EAManufacturer: Reagents IncMurakami Reagent (Etchant), 500.00 mL Poly natural (1 per EA )Learn Morewas $117.00 Special Price $87.48
- Nitric Acid, 30% w/w, 2.50 L Glass clearSKU: CN104600-2.5D1-EAManufacturer: Reagents IncNitric Acid, 30% w/w, 2.50 L Glass clear (1 per EA )Learn Morewas $122.00 Special Price $91.80
- Sodium Citrate, 50% w/v, 1.00 L Poly naturalSKU: CS005000-1A-EAManufacturer: Reagents IncSodium Citrate, 50% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $45.50 Special Price $34.56
- Sulfuric Acid, 0.02 N, 1.00 L Poly naturalSKU: C7305400-1A-EAManufacturer: Reagents IncSulfuric Acid, 0.02 N, 1.00 L Poly natural (1 per EA )Learn Morewas $38.50 Special Price $29.16
- Formaldehyde, 16% w/v, pH 8.3, 4.00 L CubitainerSKU: CF009000-4F-EAManufacturer: Reagents IncFormaldehyde, 16% w/v, pH 8.3, 4.00 L Cubitainer (1 per EA )Learn Morewas $233.00 Special Price $174.96
- Ammonium Hydroxide 5% w/w NH3, 200.00 L DrumSKU: CA011600-200E-EAManufacturer: Reagents IncAmmonium Hydroxide 5% w/w NH3, 200.00 L Drum (1 per EA )Learn Morewas $623.00 Special Price $467.64
- Copper Sulfate, 1.6%/0.4%H2SO4, 500.00 mL Poly naturalSKU: CC256000-500A-EAManufacturer: Reagents IncCopper Sulfate, 1.6%/0.4%H2SO4, 500.00 mL Poly natural (1 per EA )Learn Morewas $40.00 Special Price $30.24
- Ammonium Molybdate 2% w/v, 500.00 mL Poly naturalSKU: CA010000-500A-EAManufacturer: Reagents IncAmmonium Molybdate 2% w/v, 500.00 mL Poly natural (1 per EA )Learn Morewas $82.00 Special Price $61.56
- 1,10-Phenanthroline, 0.2% w/v, 500.00 mL Glass amberSKU: CP002200-500C-EAManufacturer: Reagents Inc1,10-Phenanthroline, 0.2% w/v, 500.00 mL Glass amber (1 per EA )Learn Morewas $68.50 Special Price $52.70
- Ammonium Acetate/Acetic Acid, 20.00 L CubitainerSKU: CA006900-20F-EAManufacturer: Reagents IncAmmonium Acetate/Acetic Acid, 20.00 L Cubitainer (1 per EA )Learn Morewas $382.00 Special Price $286.20
- Sodium Nitrite, 0.1 M (0.2 N), 1.00 L Poly naturalSKU: CS148600-1A-EAManufacturer: Reagents IncSodium Nitrite, 0.1 M (0.2 N), 1.00 L Poly natural (1 per EA )Learn Morewas $129.00 Special Price $97.20
- Borate Buffer, pH 9.5, 1.00 L Poly naturalSKU: CB009500-1A-EAManufacturer: Reagents IncBorate Buffer, pH 9.5, 1.00 L Poly natural (1 per EA )Learn Morewas $87.00 Special Price $64.80
- Hydrogen Peroxide, 30% w/w Tec, 500.00 mL Amber polySKU: CH023000-500BV-EAManufacturer: Reagents IncHydrogen Peroxide, 30% w/w Tec, 500.00 mL Amber poly (1 per EA )Learn Morewas $48.00 Special Price $35.64
- Phosphoric Acid, 50% w/w, 4.00 L Poly naturalSKU: CP225000-4A-EAManufacturer: Reagents IncPhosphoric Acid, 50% w/w, 4.00 L Poly natural (1 per EA )Learn Morewas $166.00 Special Price $124.20
- Oleic Acid, 100.00 mL Glass amberSKU: C2110000-100C-EAManufacturer: Reagents IncOleic Acid, 100.00 mL Glass amber (1 per EA )Learn Morewas $66.50 Special Price $49.68
- Sodium Thiosulfate, 0.0365N, 500.00 mL Poly naturalSKU: CS009900-500A-EAManufacturer: Reagents IncSodium Thiosulfate, 0.0365N, 500.00 mL Poly natural (1 per EA )Learn Morewas $33.50 Special Price $24.84
- Nitric Acid 1 N, 20.00 L CubitainerSKU: CN000900-20F-EAManufacturer: Reagents IncNitric Acid 1 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $337.00 Special Price $252.72
- Silver Nitrate, 0.0282 N, 20.00 L CubitainerSKU: CS004800-20F-EAManufacturer: Reagents IncSilver Nitrate, 0.0282 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $1,070.00 Special Price $802.44
- Manufacturer Reagents Inc Remove This Item
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