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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Nitric Acid, 65% w/w, 2.50 L Glass clearSKU: CN200600-2.5D1-EAManufacturer: Reagents IncNitric Acid, 65% w/w, 2.50 L Glass clear (1 per EA )Learn Morewas $230.00 Special Price $172.80 - Lactic Acid 85% Purified, 100.00 mL Poly naturalSKU: C2108000-100A-EAManufacturer: Reagents IncLactic Acid 85% Purified, 100.00 mL Poly natural (1 per EA )Learn Morewas $43.50 Special Price $32.40
- Potassium Chromate, 5% w/v, 500.00 mL Poly naturalSKU: CP101500-500A-EAManufacturer: Reagents IncPotassium Chromate, 5% w/v, 500.00 mL Poly natural (1 per EA )Learn Morewas $43.00 Special Price $32.40
- Potassium Fluoride, 50% w/v, 20.00 L CubitainerSKU: CP005100-20F-EAManufacturer: Reagents IncPotassium Fluoride, 50% w/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $2,130.00 Special Price $1,597.32
- Sodium Cyanide, 10% w/v, 4.00 L Poly naturalSKU: CS150000-4A-EAManufacturer: Reagents IncSodium Cyanide, 10% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $975.00 Special Price $731.16
- Free Lime Reagent, 20.00 L Winpak blueSKU: CF158000-20E7-EAManufacturer: Reagents IncFree Lime Reagent, 20.00 L Winpak blue (1 per EA )Learn Morewas $1,740.00 Special Price $1,304.64
- Sodium Bicarbonate, 5% w/v, 4.00 L Poly naturalSKU: CS004400-4A-EAManufacturer: Reagents IncSodium Bicarbonate, 5% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $102.00 Special Price $76.68
- Perchloric Acid, 0.1% v/v HPLC, 1.00 L Glass amberSKU: CP121400-1C-EAManufacturer: Reagents IncPerchloric Acid, 0.1% v/v HPLC, 1.00 L Glass amber (1 per EA )Learn Morewas $90.00 Special Price $68.04
- Acetic Acid Glacial, Purified, 500.00 mL Glass amberSKU: C5100500-500C-EAManufacturer: Reagents IncAcetic Acid Glacial, Purified, 500.00 mL Glass amber (1 per EA )Learn Morewas $50.00 Special Price $38.47
- Sodium Sulfite, 0.5 M Alkaline, 4.00 L Poly naturalSKU: CS149200-4A-EAManufacturer: Reagents IncSodium Sulfite, 0.5 M Alkaline, 4.00 L Poly natural (1 per EA )Learn Morewas $105.00 Special Price $78.84
- Sodium Nitroprusside, 0.05%, 500.00 mL Glass amberSKU: CS008400-500C-EAManufacturer: Reagents IncSodium Nitroprusside, 0.05%, 500.00 mL Glass amber (1 per EA )Learn Morewas $55.00 Special Price $41.04
- Ascorbic Acid, 1% w/v, 500.00 mL Glass amberSKU: C8305500-500C-EAManufacturer: Reagents IncAscorbic Acid, 1% w/v, 500.00 mL Glass amber (1 per EA )Learn Morewas $72.50 Special Price $54.00
- Toluene/MEK/Butanol, 50:40:10, 4.00 L Glass amberSKU: CT144300-4C-EAManufacturer: Reagents IncToluene/MEK/Butanol, 50:40:10, 4.00 L Glass amber (1 per EA )Learn Morewas $182.00 Special Price $140.02
- Potassium Hydroxide, 0.5 N, 1.00 L Poly naturalSKU: CP119300-1A-EAManufacturer: Reagents IncPotassium Hydroxide, 0.5 N, 1.00 L Poly natural (1 per EA )Learn Morewas $43.50 Special Price $32.40
- Titanium Alloy Etchant GE B, 500.00 mL Poly naturalSKU: CT145000-500A-EAManufacturer: Reagents IncTitanium Alloy Etchant GE B, 500.00 mL Poly natural (1 per EA )Learn Morewas $138.00 Special Price $106.16
- Sodium Acetate Buffer, pH 6.0, 10.00 L CubitainerSKU: CS123500-10F-EAManufacturer: Reagents IncSodium Acetate Buffer, pH 6.0, 10.00 L Cubitainer (1 per EA )Learn Morewas $381.00 Special Price $286.20
- Nitric Acid, 2.70 N, 500.00 mL Glass amberSKU: CN095000-500C-EAManufacturer: Reagents IncNitric Acid, 2.70 N, 500.00 mL Glass amber (1 per EA )Learn Morewas $50.00 Special Price $37.80
- Sodium Chloride, 5% w/v ASTM, 200.00 L DrumSKU: CS124500-200E-EAManufacturer: Reagents IncSodium Chloride, 5% w/v ASTM, 200.00 L Drum (1 per EA )Learn Morewas $866.00 Special Price $649.08
- Iodine, 0.002 N, 4.00 L Glass amberSKU: CI212000-4C-EAManufacturer: Reagents IncIodine, 0.002 N, 4.00 L Glass amber (1 per EA )Learn Morewas $260.00 Special Price $200.02
- Adler's Reagent (Etchant), 1.00 L Amber polySKU: CA009700-1B-EAManufacturer: Reagents IncAdler's Reagent (Etchant), 1.00 L Amber poly (1 per EA )Learn Morewas $571.00 Special Price $428.76
- Hydrofluoric Acid, 5% v/v, 4.00 L Poly naturalSKU: CH130000-4A-EAManufacturer: Reagents IncHydrofluoric Acid, 5% v/v, 4.00 L Poly natural (1 per EA )Learn Morewas $144.00 Special Price $108.00
- Potassium Fluoride, 50% w/v, 500.00 mL Poly naturalSKU: CP005100-500A-EAManufacturer: Reagents IncPotassium Fluoride, 50% w/v, 500.00 mL Poly natural (1 per EA )Learn Morewas $118.00 Special Price $88.56
- Phosphate Buffer, APHA (DPD), 500.00 mL Poly naturalSKU: CP210900-500A-EAManufacturer: Reagents IncPhosphate Buffer, APHA (DPD), 500.00 mL Poly natural (1 per EA )Learn Morewas $68.00 Special Price $50.76
- TISAB IV, for Fluoride ISE, 10.00 L CubitainerSKU: CT130000-10F-EAManufacturer: Reagents IncTISAB IV, for Fluoride ISE, 10.00 L Cubitainer (1 per EA )Learn Morewas $1,470.00 Special Price $1,130.89
- Manufacturer Reagents Inc Remove This Item
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