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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Perchloric Acid, 0.02 N / GAA, 4.00 L Poly naturalSKU: CP121200-4A-EAManufacturer: Reagents IncPerchloric Acid, 0.02 N / GAA, 4.00 L Poly natural (1 per EA )Learn Morewas $281.00 Special Price $210.60 - Ethanolamine, 45% v/v (Rgt 1), 4.00 L Poly naturalSKU: CE001900-4A-EAManufacturer: Reagents IncEthanolamine, 45% v/v (Rgt 1), 4.00 L Poly natural (1 per EA )Learn Morewas $394.00 Special Price $295.92
- Acetic Acid, 9% v/v, 55.00 gal DrumSKU: CA300900-55E-EAManufacturer: Reagents IncAcetic Acid, 9% v/v, 55.00 gal Drum (1 per EA )Learn Morewas $1,730.00 Special Price $1,297.08
- Hydrochloric Acid, 0.6 N, 200.00 L DrumSKU: CH103000-200E-EAManufacturer: Reagents IncHydrochloric Acid, 0.6 N, 200.00 L Drum (1 per EA )Learn Morewas $1,000.00 Special Price $749.52
- Phosphoric Acid, 40% w/w, 500.00 mL Poly naturalSKU: CP223700-500A-EAManufacturer: Reagents IncPhosphoric Acid, 40% w/w, 500.00 mL Poly natural (1 per EA )Learn Morewas $74.00 Special Price $55.08
- Metaphosphoric Acid, 3% w/v, 4.00 L Poly naturalSKU: CM103500-4A-EAManufacturer: Reagents IncMetaphosphoric Acid, 3% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $1,290.00 Special Price $967.68
- Formic Acid, 20% w/w, 4.00 L Poly naturalSKU: CF148000-4A-EAManufacturer: Reagents IncFormic Acid, 20% w/w, 4.00 L Poly natural (1 per EA )Learn Morewas $145.00 Special Price $109.08
- Hydrochloric Acid, 20% v/v, 20.00 L Winpak blueSKU: CH103100-20E7-EAManufacturer: Reagents IncHydrochloric Acid, 20% v/v, 20.00 L Winpak blue (1 per EA )Learn Morewas $303.00 Special Price $226.80
- Chromic-Sulfuric Cleaning Soln, 2.50 L Glass scSKU: CC220500-2.5D-EAManufacturer: Reagents IncChromic-Sulfuric Cleaning Soln, 2.50 L Glass sc (1 per EA )Learn Morewas $279.00 Special Price $209.52
- Phosphoric/Sulfuric Acid 15%, 4.00 L Poly naturalSKU: CP102700-4A-EAManufacturer: Reagents IncPhosphoric/Sulfuric Acid 15%, 4.00 L Poly natural (1 per EA )Learn Morewas $176.00 Special Price $131.76
- Sodium Chloride, 0.1 N ISA, 500.00 mL Poly naturalSKU: CS011100-500A-EAManufacturer: Reagents IncSodium Chloride, 0.1 N ISA, 500.00 mL Poly natural (1 per EA )Learn Morewas $27.00 Special Price $20.52
- DPD Indicator Solution, 4.00 L Glass amberSKU: CD280000-4C-EAManufacturer: Reagents IncDPD Indicator Solution, 4.00 L Glass amber (1 per EA )Learn Morewas $395.00 Special Price $295.92
- EDTA Titrant, 0.025M (0.05N) U, 15.00 gal DrumSKU: CE250500-15E-EAManufacturer: Reagents IncEDTA Titrant, 0.025M (0.05N) U, 15.00 gal Drum (1 per EA )Learn Morewas $284.00 Special Price $212.76
- Citric Acid Anhydrous Purified, 10.00 K EachSKU: C2104550-10KG-EAManufacturer: Reagents IncCitric Acid Anhydrous Purified, 10.00 K Each (1 per EA )Learn Morewas $428.00 Special Price $320.76
- Sodium Thiosulfate, 0.05 N, 4.00 L Glass amberSKU: CS002800-4C-EAManufacturer: Reagents IncSodium Thiosulfate, 0.05 N, 4.00 L Glass amber (1 per EA )Learn Morewas $495.00 Special Price $371.52
- Perchloric Acid, 0.1 M/ GAA, 1.00 L Glass amberSKU: CP010200-1C-EAManufacturer: Reagents IncPerchloric Acid, 0.1 M/ GAA, 1.00 L Glass amber (1 per EA )Learn Morewas $303.00 Special Price $226.80
- Chromic Acid, 30% w/v w/Iron, 500.00 mL Poly naturalSKU: CC120300-500A-EAManufacturer: Reagents IncChromic Acid, 30% w/v w/Iron, 500.00 mL Poly natural (1 per EA )Learn Morewas $114.00 Special Price $85.32
- Isopropanol, 25% w/w, 1.00 L Poly naturalSKU: CI000900-1A-EAManufacturer: Reagents IncIsopropanol, 25% w/w, 1.00 L Poly natural (1 per EA )Learn Morewas $32.00 Special Price $23.76
- Silver Nitrate, 0.001 N, 500.00 mL Glass amberSKU: CS015000-500C-EAManufacturer: Reagents IncSilver Nitrate, 0.001 N, 500.00 mL Glass amber (1 per EA )Learn Morewas $59.00 Special Price $44.28
- Hydrochloric Acid, 5% w/v, 1.00 L Poly naturalSKU: CH112500-1A-EAManufacturer: Reagents IncHydrochloric Acid, 5% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $54.50 Special Price $41.04
- TISAB I, for Fluoride ISE, 1.00 L Poly naturalSKU: C7340200-1A-EAManufacturer: Reagents IncTISAB I, for Fluoride ISE, 1.00 L Poly natural (1 per EA )Learn Morewas $50.00 Special Price $37.80
- Copper Sulfate, 20%/10% HCl, 4.00 L Poly naturalSKU: CC100500-4A-EAManufacturer: Reagents IncCopper Sulfate, 20%/10% HCl, 4.00 L Poly natural (1 per EA )Learn Morewas $197.00 Special Price $147.96
- Mixed Reagent Solution for Al, 1.00 L Poly naturalSKU: CM010000-1A-EAManufacturer: Reagents IncMixed Reagent Solution for Al, 1.00 L Poly natural (1 per EA )Learn Morewas $281.00 Special Price $210.60
- Ammonium Molybdate Reagent, 4.00 L Poly naturalSKU: CA219800-4A-EAManufacturer: Reagents IncAmmonium Molybdate Reagent, 4.00 L Poly natural (1 per EA )Learn Morewas $176.00 Special Price $131.76
- Manufacturer Reagents Inc Remove This Item
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