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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Electrode Filling Solution, 500.00 mL Poly naturalSKU: CE001700-500A-EAManufacturer: Reagents IncElectrode Filling Solution, 500.00 mL Poly natural (1 per EA )Learn Morewas $52.00 Special Price $37.80 - Tropaeolin O Indicator, 500.00 mL Glass amberSKU: CT001700-500C-EAManufacturer: Reagents IncTropaeolin O Indicator, 500.00 mL Glass amber (1 per EA )Learn Morewas $185.00 Special Price $142.32
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Dragendorff's TS - 100mLSKU: TS14104-100ml-EAManufacturer: Dawn ScientificDragendorff's TS - 100mL (1 per EA )Learn Morewas $129.62 Special Price $126.38 -
Ammonium Acetate Buffer-Iron, 1L, Poly BottleSKU: LC109702-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN2790 (1 per EA)Learn Morewas $97.50 Special Price $73.13 -
Potassium Iodide 20% W/V, 4L, Amber PolySKU: LC198004-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $571.80 Special Price $428.85 - Edta Decontaminating Solution, 1L, Poly BottleSKU: LC138002-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $74.80 Special Price $56.10
- Bromothymol Blue 0.04% (Aq), 1L, Poly BottleSKU: LC120502-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $67.90 Special Price $50.92
- Doctor Solution, 1L, Poly BottleSKU: LC136902-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $70.60 Special Price $52.95
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Potassium Fluoride 50% W/V, 10L, Cubitainer®SKU: LC191106-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $1,105.40 Special Price $829.05 - Fehlings Solution inAin, 1L, Poly BottleSKU: LC142002-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $40.80 Special Price $30.60
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Sodium Hydroxide, 6 N Aqueous Solution, APHA, 500mL, CAS# 1310-73-2SKU: S-392-500ML-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 6 N Aqueous Solution, APHA (1 per EA )Learn Morewas $47.05 Special Price $38.29 -
Potassium Iodide, 5 Percent (w/v) Aqueous Solution, For Residual Chlorine, APHA, 1L, CAS# 7681-11-0SKU: P-520-1LT-EAManufacturer: Spectrum ChemicalPotassium Iodide, 5 Percent (w/v) Aqueous Solution, For Residual Chlorine, APHA - As an APHA certified solution, this item is meets the ASTM D1209 standards and can be used in water and waste water treatment facilities to determine the concentration of dissolved and particulate materials. Spectrum Chemical manufactured APHA grade products meet the toughest regulatory standards for quality and purity. (1 per EA )Learn Morewas $71.40 Special Price $58.09 -
Buffer Solution, pH 13.0, Reference Standard, 1L, CAS# 8001-54-5SKU: B-378-1LT-EAManufacturer: Spectrum ChemicalBuffer Solution, pH 13.0, Reference Standard (1 per EA )Learn Morewas $99.95 Special Price $81.32 -
Ferrous Ammonium Sulfate, 0.1N, Standardized SolutionSKU: F-162-4LTGL-EAManufacturer: Spectrum ChemicalFerrous Ammonium Sulfate, 0.1N, Standardized Solution is a Spectrum solution concentrate that allows the preparation of fresh, reliable standard volumetric solutions quickly and accurately. Simply dilute the desired USP test solution concentrate to the specified volume (carefully following instructions provided with the package) and the resulting solution will have an exact concentration within 0.1%. Spectrum USP test solution concentrates are relied upon for fast, accurate results in life sciences and pharmaceutical quality control applications. (1 per EA )Learn Morewas $331.10 Special Price $269.41 -
Buffer Solution, pH 2.00 +/- 0.02 @ 25 DEG C, Reference StandardSKU: B-225-20LT-EAManufacturer: Spectrum ChemicalBuffer Solution, pH 2.00 +/- 0.02 @ 25 DEG C, Reference Standard is a mixture of weak acid and its conjugate base in order to prevent changes in the pH of a solution. Buffer solutions let you calibrate any pH tester to ensure accurate readings when measuring pH in water samples and process liquids. (1 per EA )Learn Morewas $518.15 Special Price $421.61 -
Ammonium Bifluoride, 10% w/v Solution, 3.8 L, Poly GallonSKU: A1025-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAmmnonium Hydrogendifluoride (1 per EA)Learn More$41.85 - Acetic Acid, 6% v/v Solution, 1 LSKU: A1060-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAcetic Acid, 6% v/v Solution, 1 L (1 per EA)Learn More$20.45
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Bromocresol Green, 0.04% w/v Solution, 120 mLSKU: B1006-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 3.8 (yellow) - pH 5.4 (blue) (1 per EA)Learn More$15.15 - Bromocresol Green, 0.04% w/v Solution, 3.8 LSKU: B1006-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 3.8 (yellow) - pH 5.4 (blue) (1 per EA)Learn More$46.55
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EDTA, 5% w/v Solution, 4 oz, PolySKU: CF1037-4oz-EAManufacturer: 710 Spirits Rocky Mtn ReagentsEDTA, 5% w/v Solution, 4 oz, Poly (1 per EA )Learn More$18.90 -
EDTA, 0.1 Molar, 1 L, PolySKU: E1008-1L-EAManufacturer: 710 Spirits Rocky Mtn Reagents0.2 N; Ethylenediaminetetraacetic Acid, Disodium Salt, Dihydrate (1 per EA)Learn More$25.00 - Hydrochloric Acid, 0.1 Normal, 1 L, PolySKU: H1008-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/10 (0.1 M) (1 per EA)Learn More$23.40
- Hydrochloric Acid, 3 Normal, PolySKU: H2008-1L-EAManufacturer: 710 Spirits Rocky Mtn Reagents3.00 ± 0.02 N (1 per EA)Learn More$29.90
- Phenol Red, 0.04% w/v Solution, 120 mLSKU: P1007-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 6.8 (yellow) - pH 8.2 (red) (1 per EA)Learn More$15.35
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