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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Acetonitrile, HPLC, with 0.1% v/v Formic Acid, 4 L, Amber GlassSKU: CF1196-4L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsHPLC Mobile Phase [Custom for Origins, Inc.] (1 per EA)Learn More$134.60 -
Ammonium Chloride Hydroxide Buffer, pH 9.5, 1 LSKU: A1031-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAmmonium Chloride Hydroxide Buffer, pH 9.5, 1 L (1 per EA)Learn More$25.30 - Bromothymol Blue, 0.04% w/v Solution, 1 LSKU: B1013-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 6.0 (yellow) - pH 7.6 (blue) (1 per EA)Learn More$18.85
- Sulfuric Acid, 0.95 Normal, 3.8 L, Poly GallonSKU: S1118-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSulfuric Acid, 0.95 Normal, 3.8 L, Poly Gallon (1 per EA)Learn More$37.05
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Hydrogen Peroxide, 15% w/w Solution, Technical, 5 gal, CAS# 7722-84-1SKU: H1024-5gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsHydrogen Peroxide, 15% w/w Solution, Technical, 5 gal, CAS# 7722-84-1 (1 per EA)Learn More$102.30 - Potassium Chlorate, 8% w/v Solution, 1 L, PolySKU: P1004-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSaturated Solution (1 per EA)Learn More$84.30
- Potassium Chromate, 5% w/v Solution, 1 L, PolySKU: P1035-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Chromate, 5% w/v Solution, 1 L, Poly (1 per EA)Learn More$37.30
- Sulfosalicylic Acid, 10% w/v Solution, 1 L, PolySKU: S1056-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSulfosalicylic Acid, 10% w/v Solution, 1 L, Poly (1 per EA )Learn More$43.85
- Sodium Hydroxide, 30% w/w Solution, 3.8 LSKU: S1125-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsCaustic Soda (1 per EA)Learn More$72.10
- Potassium Iodide, 0.1 Normal, 3.8 L, Amber GlassSKU: P1021-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Iodide, 0.1 Normal, 3.8 L, Amber Glass (1 per EA)Learn More$53.20
- Wright's Buffer, pH 6.4, 120 mLSKU: W1002-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsWright's Buffer, pH 6.4, 120 mL (1 per EA)Learn More$15.55
- Phenol Red, 1% w/v Solution, 1 LSKU: P1008-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 6.8 (yellow) - pH 8.2 (red) (1 per EA)Learn More$155.20
- Potassium Hydroxide, 20% w/v Solution, 1 LSKU: P1044-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsCaustic Potash; Potassium Hydrate (1 per EA)Learn More$29.35
- Silver Nitrate, 1% w/v Solution, 1 L, Amber PolySKU: S1007-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSilver Nitrate, 1% w/v Solution, 1 L, Amber Poly (1 per EA)Learn More$86.50
- Starch Indicator, 2% w/v Solution, 120 mLSKU: S1134-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotato Starch; Stabilized with Salicylic Acid (1 per EA)Learn More$15.20
- pH 4.00 Calibration Buffer, Red, 3.8 LSKU: P1001-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsNIST Traceable; pH = 4.00 ? 0.01 @ 25 ?C (1 per EA)Learn More$33.40
- Potassium Hydroxide, 50% w/w Solution, 1 L, PolySKU: P1214-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Hydroxide, 50% w/w Solution, 1 L, Poly (1 per EA )Learn More$162.50
- Sodium Chloride, 10% w/w Solution, 55 gal, Poly DrumSKU: CF1236-55gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSodium Chloride, 10% w/w Solution, 55 gal, Poly Drum (1 per EA )Learn More$518.80
- Benedict's Reagent, 500 mLSKU: B1025-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsQualitative for Detection of Sugar (1 per EA)Learn More$25.00
- Hydrochloric Acid, 0.450 Normal, 3.8 L, Poly GallonSKU: CF1287-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsHydrochloric Acid, 0.450 Normal, 3.8 L, Poly Gallon (1 per EA )Learn More$42.05
- Sodium Chloride, 5% w/w Solution, 1 L, PolySKU: CF1290-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSodium Chloride, 5% w/w Solution, 1 L, Poly (1 per EA )Learn More$19.20
- FAS Indicator, 5% w/v in 1% v/v Nitric Acid, 100 mLSKU: F1014-100mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsFerric Ammonium Sulfate, Dodecahydrate (1 per EA)Learn More$20.15
- pH 7.00 Calibration Buffer, Yellow, 3.8 LSKU: P1002-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsNIST Traceable; pH = 7.00 ? 0.01 @ 25 ?C (1 per EA)Learn More$32.25
- Sulfuric Acid, 50% v/v Solution, 3.8 LSKU: S1067-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSulfuric Acid, 50% v/v Solution, 3.8 L (1 per EA)Learn More$66.30
- Manufacturer 710 Spirits Rocky Mtn Reagents Remove This Item
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