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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Sulfuric Acid, 3 N, 1.00 L Poly naturalSKU: CS203100-1A-EAManufacturer: Reagents IncSulfuric Acid, 3 N, 1.00 L Poly natural (1 per EA )Learn Morewas $46.50 Special Price $35.77 - Zinc Sulfate, 0.02 M, 4.00 L Poly naturalSKU: CZ000500-4A-EAManufacturer: Reagents IncZinc Sulfate, 0.02 M, 4.00 L Poly natural (1 per EA )Learn Morewas $244.00 Special Price $187.71
- Zero Oxygen Solution, 120.00 mL Poly naturalSKU: CZ129700-120A-EAManufacturer: Reagents IncZero Oxygen Solution, 120.00 mL Poly natural (1 per EA )Learn Morewas $52.50 Special Price $40.39
- Mercury-EDTA Complex, 500.00 mL Poly naturalSKU: CM119500-500A-EAManufacturer: Reagents IncMercury-EDTA Complex, 500.00 mL Poly natural (1 per EA )Learn Morewas $177.00 Special Price $132.84
- Ammonium Hydroxide, 16.7% v/v, 20.00 L CubitainerSKU: CA015200-20F-EAManufacturer: Reagents IncAmmonium Hydroxide, 16.7% v/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $382.00 Special Price $286.20
- ORP Buffer 4 (246 mV), 1.00 L Poly naturalSKU: CO005100-1A-EAManufacturer: Reagents IncORP Buffer 4 (246 mV), 1.00 L Poly natural (1 per EA )Learn Morewas $113.00 Special Price $84.24
- Phosphate Vanadomolybdate, 1.00 L Poly naturalSKU: CP005400-1A-EAManufacturer: Reagents IncPhosphate Vanadomolybdate, 1.00 L Poly natural (1 per EA )Learn Morewas $75.00 Special Price $56.16
- Sodium Chloride, 0.9% w/w, 200.00 L DrumSKU: CS140200-200E-EAManufacturer: Reagents IncSodium Chloride, 0.9% w/w, 200.00 L Drum (1 per EA )Learn Morewas $510.00 Special Price $382.32
- Boric Acid Purified, 50.00 K Drum, FiberSKU: C2104300-50F4-EAManufacturer: Reagents IncBoric Acid Purified, 50.00 K Drum, Fiber (1 per EA )Learn Morewas $1,400.00 Special Price $1,049.76
- Isopropanol, 20% v/v, 1.00 L Poly naturalSKU: CI000800-1A-EAManufacturer: Reagents IncIsopropanol, 20% v/v, 1.00 L Poly natural (1 per EA )Learn Morewas $81.00 Special Price $60.48
- Hydrochloric Acid, 31.5% w/w, 2.50 L Glass clearSKU: CH111000-2.5D1-EAManufacturer: Reagents IncHydrochloric Acid, 31.5% w/w, 2.50 L Glass clear (1 per EA )Learn Morewas $117.00 Special Price $87.48
- EDTA Titrant, 0.01 M, 500.00 mL Poly naturalSKU: CE250400-500A-EAManufacturer: Reagents IncEDTA Titrant, 0.01 M, 500.00 mL Poly natural (1 per EA )Learn Morewas $33.50 Special Price $24.84
- Hydrogen Peroxide, 35% w/w, 200.00 L DrumSKU: CH302000-200E-EAManufacturer: Reagents IncHydrogen Peroxide, 35% w/w, 200.00 L Drum (1 per EA )Learn Morewas $2,490.00 Special Price $1,867.32
- Phosphate Buffer,0.05 M,pH 7.4, 4.00 L Poly naturalSKU: CP209500-4A-EAManufacturer: Reagents IncPhosphate Buffer,0.05 M,pH 7.4, 4.00 L Poly natural (1 per EA )Learn Morewas $105.00 Special Price $80.78
- Potassium Iodide, 15% w/v, 1.00 L Glass amberSKU: C7286150-1C-EAManufacturer: Reagents IncPotassium Iodide, 15% w/v, 1.00 L Glass amber (1 per EA )Learn Morewas $88.50 Special Price $65.88
- Ammonium Oxalate, Saturated, 1.00 L Poly naturalSKU: CA103100-1A-EAManufacturer: Reagents IncAmmonium Oxalate, Saturated, 1.00 L Poly natural (1 per EA )Learn Morewas $125.00 Special Price $93.96
- Formaldehyde, 37% purified, 1.00 L Poly naturalSKU: C2208500-1A-EAManufacturer: Reagents IncFormaldehyde, 37% purified, 1.00 L Poly natural (1 per EA )Learn Morewas $64.50 Special Price $48.60
- Potassium Chloride, 6% w/v, 20.00 L CubitainerSKU: CP113200-20F-EAManufacturer: Reagents IncPotassium Chloride, 6% w/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $239.00 Special Price $179.28
- Lead Nitrate Stock, 100 ppm Pb, 1.00 L Glass amberSKU: CL170000-1C-EAManufacturer: Reagents IncLead Nitrate Stock, 100 ppm Pb, 1.00 L Glass amber (1 per EA )Learn Morewas $119.00 Special Price $89.64
- Sodium Thiosulfate 0.1 N, 1.00 L Poly naturalSKU: C7328100-1A-EAManufacturer: Reagents IncSodium Thiosulfate 0.1 N, 1.00 L Poly natural (1 per EA )Learn Morewas $32.50 Special Price $24.84
- Citric Acid, 10% w/v, 1.00 L Poly naturalSKU: CC204100-1A-EAManufacturer: Reagents IncCitric Acid, 10% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $89.00 Special Price $66.96
- Ammonium Thiocyanate, 0.5 N, 1.00 L Poly naturalSKU: CA014900-1A-EAManufacturer: Reagents IncAmmonium Thiocyanate, 0.5 N, 1.00 L Poly natural (1 per EA )Learn Morewas $54.00 Special Price $41.04
- Oxalic Acid Dihydrate Purified, 50.00 K Drum, FiberSKU: C2110500-50F4-EAManufacturer: Reagents IncOxalic Acid Dihydrate Purified, 50.00 K Drum, Fiber (1 per EA )Learn Morewas $882.00 Special Price $662.04
- Acetic Acid Glacial, Purified, 20.00 L Winpak blueSKU: C5100500-20E7-EAManufacturer: Reagents IncAcetic Acid Glacial, Purified, 20.00 L Winpak blue (1 per EA )Learn Morewas $480.00 Special Price $359.64
- Manufacturer Reagents Inc Remove This Item
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