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 Fluoride, 1 Normal, 1 L, PolySKU: P1187-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Fluoride, 1 Normal, 1 L, Poly (1 per EA )Learn More$44.20 - Sodium Thiosulfate, 0.02 Normal, 3.8 L, Amber PolySKU: S1038-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/50 (0.02 M) (1 per EA)Learn More$36.15
- Sulfuric Acid, 0.02 Normal, 1 L, PolySKU: S1058-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/50 (0.01 M) (1 per EA)Learn More$20.20
- Sulfuric Acid, 0.1 Normal, 3.8 L, Poly GallonSKU: S1059-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/10 (0.05 M) (1 per EA)Learn More$34.75
- Sodium Hydroxide, 0.05 Normal, 1 L, PolySKU: S1082-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/20 (0.05 M) (1 per EA)Learn More$20.45
- Sulfo Orange Indicator, 0.1% w/v Aqueous, 1 LSKU: S1100-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSulfo Orange Indicator, 0.1% w/v Aqueous, 1 L (1 per EA)Learn More$38.00
- Sodium Thiosulfate, 0.01 Normal, 3.8 L, Amber PolySKU: S1112-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/100 (0.01 M) (1 per EA)Learn More$35.95
- Starch Indicator, 1% w/w Aqueous, 120 mL, PolySKU: S1228-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsStarch Indicator, 1% w/w Aqueous, 120 mL, Poly (1 per EA )Learn More$17.65
- Toluidine Blue, 1% w/v with 1% v/v Acetic Acid in 20% v/v Denatured Ethanol, 60 mLSKU: T1009-60mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsToluidine Blue, 1% w/v with 1% v/v Acetic Acid in 20% v/v Denatured Ethanol, 60 mL (1 per EA)Learn More$19.60
- Ammonium Hydroxide, 50% v/v Solution, 3.8 LSKU: A1032-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAqueous Ammonia (1 per EA)Learn More$71.75
- Potassium Permanganate, 0.042 Normal, 1 L, Amber PolySKU: CF1200-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Permanganate, 0.042 Normal, 1 L, Amber Poly (1 per EA )Learn More$57.15
- Ferric Nitrate, 50% w/v Solution, 500 mL, PolySKU: F1007-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsFerric Nitrate, 50% w/v Solution, 500 mL, Poly (1 per EA)Learn More$96.90
- Potassium Iodide, 10% w/w Solution, 3.8 L, PolySKU: P1208-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Iodide, 10% w/w Solution, 3.8 L, Poly (1 per EA )Learn More$107.40
- Bromocresol Green-Methyl Red Indicator, 1% w/v in Denatured Ethanol, 20 L, CubitainerSKU: B1079-20L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsBromocresol Green-Methyl Red Indicator, 1% w/v in Denatured Ethanol, 20 L, Cubitainer (1 per EA )Learn More$1,168.75
- Methyl Orange/Xylene Cyanol, 0.4% w/v Solution, 3.8 LSKU: M1013-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 2.9 (purple) - pH 4.6 (green) (1 per EA)Learn More$346.70
- Phenol Red, 1% w/v Solution, 3.8 LSKU: P1008-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 6.8 (yellow) - pH 8.2 (red) (1 per EA)Learn More$428.70
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Glutaraldehyde, 24 Percent Aqueous Solution, 20L, CAS# 111-30-8SKU: GL140-20LTBL-EAManufacturer: Spectrum ChemicalGlutaraldehyde, 24 Percent Aqueous Solution - Ungraded products supplied by Spectrum are indicative of a grade suitable for general industrial use or research purposes and typically are not suitable for human consumption or therapeutic use. (1 per EA )Learn More$2,119.80 -
Pd 250 Reagent Refill, Vario Total Chlorine 2 X 250 Tests, Ea/1SKU: 530155-EAManufacturer: Lovibond Tintometer Group530155, PD 250 Reagent Refill, VARIO Total Chlorine 500 pcs Suitable for colorimetric and photometric determination of Total Chlorine with powder dispenser PD 250 The PD250 is designed for easy and controlled dosage of DPD powder reagents. One click giv (1 per EA )Learn More$123.20 - Acetic Acid-Chloroform, 60:40 (v/v) Solution, 500mLSKU: A1003-500MLGL-EAManufacturer: Spectrum ChemicalAcetic Acid-Chloroform, 60:40 (v/v) Solution is a pre-mixed solvent used in the determination of peroxide value (POV) in fats and oils. Ungraded products supplied by Spectrum are indicative of a grade suitable for general industrial use or research purposes and typically are not suitable for human consumption or therapeutic use. (1 per EA )Learn Morewas $111.70 Special Price $90.88
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Ferric Alum Indicator Volhard, 500.00 mL Poly naturalSKU: CF128200-500A-EAManufacturer: Reagents IncFerric Alum Indicator Volhard, 500.00 mL Poly natural (1 per EA )Learn Morewas $90.00 Special Price $68.04 -
Acid Solution, 2 ozSKU: R-0942-C-EAManufacturer: Taylor TechnologiesAcid Solution, 2 oz (1 per EA)Learn Morewas $34.42 Special Price $26.29 - Sodium Chloride, Sat'd Aqueous, 4.00 L Poly naturalSKU: CS152700-4A-EAManufacturer: Reagents IncSodium Chloride, Sat'd Aqueous, 4.00 L Poly natural (1 per EA )Learn Morewas $100.00 Special Price $74.52
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Acetic Acid-Ammonium Actate Buffer TS - 500mLSKU: TS14004-500ml-EAManufacturer: Dawn ScientificAcetic Acid-Ammonium Actate Buffer TS - 500mL (1 per EA )Learn Morewas $59.62 Special Price $58.13 - Phosphoric Acid, 75% w/w, 55.00 gal DrumSKU: CP209200-55E-EAManufacturer: Reagents IncPhosphoric Acid, 75% w/w, 55.00 gal Drum (1 per EA )Learn Morewas $10,000.00 Special Price $7,499.52
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