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 Permanganate, 0.1 N, 500.00 mL Glass amberSKU: C7288510-500C-EAManufacturer: Reagents IncPotassium Permanganate, 0.1 N, 500.00 mL Glass amber (1 per EA )Learn Morewas $33.00 Special Price $24.84 - Sodium Borate, 2% w/v, 1.00 L Poly naturalSKU: C7310510-1A-EAManufacturer: Reagents IncSodium Borate, 2% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $155.00 Special Price $116.64
- Borate Buffer, pH 9.5, 500.00 mL Poly naturalSKU: CB009500-500A-EAManufacturer: Reagents IncBorate Buffer, pH 9.5, 500.00 mL Poly natural (1 per EA )Learn Morewas $57.00 Special Price $43.20
- Sodium Hydroxide, 17.5% w/v, 4.00 L Poly naturalSKU: CS160800-4A-EAManufacturer: Reagents IncSodium Hydroxide, 17.5% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $172.00 Special Price $128.52
- Sodium Metabisulfite, 10% w/v, 250.00 mL Poly naturalSKU: CS132300-250A-EAManufacturer: Reagents IncSodium Metabisulfite, 10% w/v, 250.00 mL Poly natural (1 per EA )Learn Morewas $82.00 Special Price $61.56
- Hydrogen Peroxide, 35% w/w, 20.00 L Winpak blueSKU: CH302000-20E7-EAManufacturer: Reagents IncHydrogen Peroxide, 35% w/w, 20.00 L Winpak blue (1 per EA )Learn Morewas $300.00 Special Price $224.64
- Hyamine Solution 0.004 M (N), 4.00 L Poly naturalSKU: CH114700-4A-EAManufacturer: Reagents IncHyamine Solution 0.004 M (N), 4.00 L Poly natural (1 per EA )Learn Morewas $179.00 Special Price $133.92
- Ammonium Hydroxide, 25% v/v, 4.00 L Poly naturalSKU: CA100300-4A-EAManufacturer: Reagents IncAmmonium Hydroxide, 25% v/v, 4.00 L Poly natural (1 per EA )Learn Morewas $148.00 Special Price $111.24
- Formic Acid, 90%, 4.00 L Poly naturalSKU: C2105000-4A-EAManufacturer: Reagents IncFormic Acid, 90%, 4.00 L Poly natural (1 per EA )Learn Morewas $199.00 Special Price $149.04
- Sodium Bisulfate, saturated, 4.00 L Poly naturalSKU: CS142500-4A-EAManufacturer: Reagents IncSodium Bisulfate, saturated, 4.00 L Poly natural (1 per EA )Learn Morewas $214.00 Special Price $160.92
- Calmagite Indicator, 0.1% w/v, 120.00 mL Poly naturalSKU: CC002100-120A-EAManufacturer: Reagents IncCalmagite Indicator, 0.1% w/v, 120.00 mL Poly natural (1 per EA )Learn Morewas $32.00 Special Price $23.76
- Iron Buffer Solution, 500.00 mL Poly naturalSKU: CI003100-500A-EAManufacturer: Reagents IncIron Buffer Solution, 500.00 mL Poly natural (1 per EA )Learn Morewas $75.00 Special Price $56.16
- Hexylamine in Acetonitrile, 4.00 L Glass amberSKU: CN000400-4C-EAManufacturer: Reagents IncHexylamine in Acetonitrile, 4.00 L Glass amber (1 per EA )Learn Morewas $725.00 Special Price $543.24
- VB XO, 1.00 L Amber polySKU: C8310200-1B-EAManufacturer: Reagents IncVB XO, 1.00 L Amber poly (1 per EA )Learn Morewas $141.00 Special Price $105.84
- Hydration Water pH 7.5-8.0, 200.00 L DrumSKU: CH002100-200E-EAManufacturer: Reagents IncHydration Water pH 7.5-8.0, 200.00 L Drum (1 per EA )Learn Morewas $485.00 Special Price $363.96
- Chlorobenzene/Acetic Ac,67:33, 4.00 L glass sc ambSKU: CC103000-4C1-EAManufacturer: Reagents IncChlorobenzene/Acetic Ac,67:33, 4.00 L glass sc amb (1 per EA )Learn Morewas $281.00 Special Price $210.60
- Copper Sulfate, 0.1 M, 1.00 L Poly naturalSKU: CC100400-1A-EAManufacturer: Reagents IncCopper Sulfate, 0.1 M, 1.00 L Poly natural (1 per EA )Learn Morewas $130.00 Special Price $97.20
- Potassium Nitrate, Saturated, 250.00 mL Glass amberSKU: C7286500-250C-EAManufacturer: Reagents IncPotassium Nitrate, Saturated, 250.00 mL Glass amber (1 per EA )Learn Morewas $116.00 Special Price $87.48
- Sulfuric Acid, 15% w/H3PO4, 4.00 L Poly naturalSKU: CS134600-4A-EAManufacturer: Reagents IncSulfuric Acid, 15% w/H3PO4, 4.00 L Poly natural (1 per EA )Learn Morewas $107.00 Special Price $79.92
- Sulfuric Acid, 93% (66° Baume), 4.00 L Poly naturalSKU: C5102700-4A-EAManufacturer: Reagents IncSulfuric Acid, 93% (66° Baume), 4.00 L Poly natural (1 per EA )Learn Morewas $84.50 Special Price $63.72
- Ammonium Persulfate, 20% w/v, 500.00 mL Poly naturalSKU: CA001300-500AV-EAManufacturer: Reagents IncAmmonium Persulfate, 20% w/v, 500.00 mL Poly natural (1 per EA )Learn Morewas $75.00 Special Price $56.16
- Alum, 10% w/v, 4.00 L Poly naturalSKU: CA015700-4A-EAManufacturer: Reagents IncAlum, 10% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $129.00 Special Price $97.20
- Potassium Hydroxide, 31% w/w, 4.00 L Poly naturalSKU: CP302000-4A-EAManufacturer: Reagents IncPotassium Hydroxide, 31% w/w, 4.00 L Poly natural (1 per EA )Learn Morewas $280.00 Special Price $209.52
- Sodium Sulfite, 1 M, pH 9.5, 20.00 L CubitainerSKU: CS149800-20F-EAManufacturer: Reagents IncSodium Sulfite, 1 M, pH 9.5, 20.00 L Cubitainer (1 per EA )Learn Morewas $460.00 Special Price $344.52
- Manufacturer Reagents Inc Remove This Item
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