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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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 - Hydrochloric Acid, 25% w/w, 20.00 L Winpak blueSKU: CH110500-20E7-EAManufacturer: Reagents IncHydrochloric Acid, 25% w/w, 20.00 L Winpak blue (1 per EA )Learn Morewas $361.00 Special Price $271.08
- Iodine-Bromine Solution, Hanus, 500.00 mL Glass amberSKU: C7218000-500C-EAManufacturer: Reagents IncIodine-Bromine Solution, Hanus, 500.00 mL Glass amber (1 per EA )Learn Morewas $139.00 Special Price $104.76
- Sodium Thiosulfate, 0.15 N, 20.00 L CubitainerSKU: CS013500-20F-EAManufacturer: Reagents IncSodium Thiosulfate, 0.15 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $201.00 Special Price $151.20
- Potassium Permanganate, 0.1 N, 4.00 L Poly naturalSKU: C7288510-4A-EAManufacturer: Reagents IncPotassium Permanganate, 0.1 N, 4.00 L Poly natural (1 per EA )Learn Morewas $100.00 Special Price $74.52
- Silver Nitrate, 0.001 N, 1.00 L Glass amberSKU: CS015000-1C-EAManufacturer: Reagents IncSilver Nitrate, 0.001 N, 1.00 L Glass amber (1 per EA )Learn Morewas $84.50 Special Price $63.72
- Citric Acid, 20% w/v, 20.00 L CubitainerSKU: CC204200-20F-EAManufacturer: Reagents IncCitric Acid, 20% w/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $226.00 Special Price $169.56
- Phosphate Buffer, APHA (DPD), 4.00 L Poly naturalSKU: CP210900-4A-EAManufacturer: Reagents IncPhosphate Buffer, APHA (DPD), 4.00 L Poly natural (1 per EA )Learn Morewas $270.00 Special Price $203.04
- Sulfamic Acid Technical, 50.00 lb Drum, FiberSKU: C2114333-50F5-EAManufacturer: Reagents IncSulfamic Acid Technical, 50.00 lb Drum, Fiber (1 per EA )Learn Morewas $913.00 Special Price $684.72
- Hydrochloric Acid, 0.9434 N, 10.00 L CubitainerSKU: CH119200-10F-EAManufacturer: Reagents IncHydrochloric Acid, 0.9434 N, 10.00 L Cubitainer (1 per EA )Learn Morewas $156.00 Special Price $116.64
- Perchloric Acid, 0.2% v/v, 4.00 L Poly naturalSKU: CP121100-4A-EAManufacturer: Reagents IncPerchloric Acid, 0.2% v/v, 4.00 L Poly natural (1 per EA )Learn Morewas $114.00 Special Price $85.32
- Perchloric Acid, 2 N, 500.00 mL Glass amberSKU: CP121300-500C-EAManufacturer: Reagents IncPerchloric Acid, 2 N, 500.00 mL Glass amber (1 per EA )Learn Morewas $66.00 Special Price $49.68
- Ethanolamine, 20% w/v, 10.00 L Clear WinpakSKU: CE000100-10E2-EAManufacturer: Reagents IncEthanolamine, 20% w/v, 10.00 L Clear Winpak (1 per EA )Learn Morewas $690.00 Special Price $517.32
- Borate Buffer, pH 9.9, Rgt 2, 4.00 L Poly naturalSKU: CB119300-4A-EAManufacturer: Reagents IncBorate Buffer, pH 9.9, Rgt 2, 4.00 L Poly natural (1 per EA )Learn Morewas $140.00 Special Price $104.76
- Borate Buffer, pH 9.9, Rgt 2, 10.00 L CubitainerSKU: CB119300-10F-EAManufacturer: Reagents IncBorate Buffer, pH 9.9, Rgt 2, 10.00 L Cubitainer (1 per EA )Learn Morewas $282.00 Special Price $211.68
- FFA Neutralized Alcohol, 500.00 mL Poly naturalSKU: CN102400-500A-EAManufacturer: Reagents IncFFA Neutralized Alcohol, 500.00 mL Poly natural (1 per EA )Learn Morewas $55.50 Special Price $42.12
- Sodium Periodate, 6% w/v, 4.00 L Glass amberSKU: CS042000-4C-EAManufacturer: Reagents IncSodium Periodate, 6% w/v, 4.00 L Glass amber (1 per EA )Learn Morewas $2,140.00 Special Price $1,604.88
- Ammonium Hydroxide, 1:99 v/v, 1.00 L Poly naturalSKU: CA007600-1A-EAManufacturer: Reagents IncAmmonium Hydroxide, 1:99 v/v, 1.00 L Poly natural (1 per EA )Learn Morewas $59.00 Special Price $44.28
- Sodium Carbonate, 10% w/v, 4.00 L Poly naturalSKU: CS102800-4A-EAManufacturer: Reagents IncSodium Carbonate, 10% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $213.00 Special Price $159.84
- Iodine, 0.1 N, 1:1.5 I2:KI, 4.00 L Glass amberSKU: CI201200-4C-EAManufacturer: Reagents IncIodine, 0.1 N, 1:1.5 I2:KI, 4.00 L Glass amber (1 per EA )Learn Morewas $175.00 Special Price $131.76
- Citric Acid, 15% w/w, 250.00 mL Glass amberSKU: CC204700-250C-EAManufacturer: Reagents IncCitric Acid, 15% w/w, 250.00 mL Glass amber (1 per EA )Learn Morewas $40.00 Special Price $30.24
- Electrolyte Solution, Aqueous, 10.00 L CubitainerSKU: CE249600-10F-EAManufacturer: Reagents IncElectrolyte Solution, Aqueous, 10.00 L Cubitainer (1 per EA )Learn Morewas $368.00 Special Price $276.48
- Acetate Buffer pH 4.0 APHA, 4.00 L Poly naturalSKU: CA016400-4A-EAManufacturer: Reagents IncAcetate Buffer pH 4.0 APHA, 4.00 L Poly natural (1 per EA )Learn Morewas $202.00 Special Price $151.20
- 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
- Manufacturer Reagents Inc Remove This Item
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