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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Phosphate Buffer, pH 7.60, 20.00 L CubitainerSKU: CP211200-20F-EAManufacturer: Reagents IncPhosphate Buffer, pH 7.60, 20.00 L Cubitainer (1 per EA )Learn Morewas $327.00 Special Price $245.16 - Sulfuric Acid, 2+5 by volume, 1.00 L Glass amberSKU: CS146700-1C-EAManufacturer: Reagents IncSulfuric Acid, 2+5 by volume, 1.00 L Glass amber (1 per EA )Learn Morewas $197.00 Special Price $147.96
- TISAB I, for Fluoride ISE, 20.00 L CubitainerSKU: C7340200-20F-EAManufacturer: Reagents IncTISAB I, for Fluoride ISE, 20.00 L Cubitainer (1 per EA )Learn Morewas $708.00 Special Price $531.36
- Ferrous Amm Sulfate, 22 g/L Fe, 1.00 L Amber polySKU: CF131300-1B-EAManufacturer: Reagents IncFerrous Amm Sulfate, 22 g/L Fe, 1.00 L Amber poly (1 per EA )Learn Morewas $56.00 Special Price $42.12
- Buffer, pH 5.00, 20.00 L CubitainerSKU: C2155250-20F-EAManufacturer: Reagents IncBuffer, pH 5.00, 20.00 L Cubitainer (1 per EA )Learn Morewas $187.00 Special Price $140.40
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Ammonium Chloride TS - 100mLSKU: TS14036-100ml-EAManufacturer: Dawn ScientificAmmonium Chloride TS - 100mL (1 per EA )Learn Morewas $44.62 Special Price $43.50 - Barium Nitrate TS - 500mLSKU: TS14051-500ml-EAManufacturer: Dawn ScientificBarium Nitrate TS - 500mL (1 per EA )Learn Morewas $89.62 Special Price $87.38
- Buffered Acetone TS - 100mLSKU: TS14066-100ml-EAManufacturer: Dawn ScientificBuffered Acetone TS - 100mL (1 per EA )Learn Morewas $34.62 Special Price $33.75
- Barium Chloride TS - 100mLSKU: TS14049-100ml-EAManufacturer: Dawn ScientificBarium Chloride TS - 100mL (1 per EA )Learn Morewas $26.62 Special Price $25.95
- Potassium Hydroxide TS - 500mLSKU: TS14219-500ml-EAManufacturer: Dawn ScientificPotassium Hydroxide TS - 500mL (1 per EA )Learn Morewas $46.62 Special Price $45.46
- Stannous Chloride, Acid, TS - 100mLSKU: TS14271-100ml-EAManufacturer: Dawn ScientificStannous Chloride, Acid, TS - 100mL (1 per EA )Learn Morewas $59.62 Special Price $58.13
- Acetic Acid / Isooctane 60:40, 2.50 L Glass scSKU: CA100700-2.5D-EAManufacturer: Reagents IncAcetic Acid / Isooctane 60:40, 2.50 L Glass sc (1 per EA )Learn Morewas $253.00 Special Price $190.08
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Sodium Carbonate, SVS Concentrate, To Prepare 0.1 N Solution, 1UNIT, CAS# 497-19-8SKU: SV215-1UNIT-EAManufacturer: Spectrum ChemicalSodium Carbonate, SVS Concentrate, To Prepare 0.1 N Solution (1 per EA )Learn More$161.90 -
Sodium Hydroxide, 20% w/v Solution, 500 mLSKU: S1126-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsCaustic Soda (1 per EA)Learn More$21.25 - Acetic Acid / Periodic Acid, 2.50 L Glass clearSKU: CA009800-2.5D1-EAManufacturer: Reagents IncAcetic Acid / Periodic Acid, 2.50 L Glass clear (1 per EA )Learn Morewas $170.00 Special Price $127.44
- Potassium Dichromate, 0.395 N, 4.00 L Poly naturalSKU: CP201900-4A-EAManufacturer: Reagents IncPotassium Dichromate, 0.395 N, 4.00 L Poly natural (1 per EA )Learn Morewas $118.00 Special Price $88.56
- Sulfuric Acid, 1 N, 20.00 L CubitainerSKU: C7305560-20F-EAManufacturer: Reagents IncSulfuric Acid, 1 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $230.00 Special Price $172.80
- Sulfuric Acid, 50% v/v, 4.00 L Poly naturalSKU: C7306200-4A-EAManufacturer: Reagents IncSulfuric Acid, 50% v/v, 4.00 L Poly natural (1 per EA )Learn Morewas $143.00 Special Price $106.92
- EDTA Titrant, 0.025 M, 0.05 N, 10.00 L CubitainerSKU: CE250510-10F-EAManufacturer: Reagents IncEDTA Titrant, 0.025 M, 0.05 N, 10.00 L Cubitainer (1 per EA )Learn Morewas $216.00 Special Price $162.00
- Pot Hydroxide, 0.1 N / Rgt Alc, 1.00 L Glass amberSKU: CP116800-1C-EAManufacturer: Reagents IncPot Hydroxide, 0.1 N / Rgt Alc, 1.00 L Glass amber (1 per EA )Learn Morewas $87.00 Special Price $64.80
- Extraction Solvent, 15.00 gal DrumSKU: CE261100-15E-EAManufacturer: Reagents IncExtraction Solvent, 15.00 gal Drum (1 per EA )Learn Morewas $3,240.00 Special Price $2,430.00
- Barium Chloride, 0.387 N, 1.00 L Poly naturalSKU: CB113700-1A-EAManufacturer: Reagents IncBarium Chloride, 0.387 N, 1.00 L Poly natural (1 per EA )Learn Morewas $134.00 Special Price $100.44
- EDTA Titrant, 0.05 M, 250.00 mL Poly naturalSKU: CE253000-250A-EAManufacturer: Reagents IncEDTA Titrant, 0.05 M, 250.00 mL Poly natural (1 per EA )Learn Morewas $32.00 Special Price $23.76
- Sodium Acetate, 20% w/w, 500.00 mL Poly naturalSKU: CS123200-500A-EAManufacturer: Reagents IncSodium Acetate, 20% w/w, 500.00 mL Poly natural (1 per EA )Learn Morewas $56.00 Special Price $42.12
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