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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Silver Nitrate, 0.025N (0.025M), 500ML, Amber GlassSKU: LC226401-EAManufacturer: LabChemShelf Life (months): 18, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $77.00 Special Price $57.75 -
Mbth Indicator 0.05%, 125ML, Poly BottleSKU: LC163307-EAManufacturer: LabChemShelf Life (months): 6, , UN Number: (1 per EA)Learn Morewas $55.00 Special Price $41.25 - Mercuric Nitrate 0.35G/L, 500ML, Amber GlassSKU: LC166801-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $64.80 Special Price $48.60
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Sodium Hydroxide 24% W/V, 1L, Poly BottleSKU: LC241002-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $87.20 Special Price $65.40 -
Potassium Iodide 5% W/V, 1L, Amber PolySKU: LC197402-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $72.60 Special Price $54.45 -
Ammonium Hydroxide 5% V/V (1+19), 500ML, Poly BottleSKU: LC111901-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $54.50 Special Price $40.88 -
Iodide Iodate Reagent (25 mL sample, 1 drop = 2 ppm Na₂SO₃), 16 ozSKU: R-0808-E-EAManufacturer: Taylor TechnologiesIodide Iodate Reagent (25 mL sample, 1 drop = 2 ppm Na₂SO₃), 16 oz (1 per EA)Learn Morewas $28.65 Special Price $21.89 -
Chloride Reagent, 2 oz, Dropper BottleSKU: R-0682-C-EAManufacturer: Taylor TechnologiesChloride Reagent, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $33.20 Special Price $25.36 - Glycine 7% W/V, 125ML, Poly BottleSKU: LC148787-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $70.00 Special Price $52.50
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Potassium Permanganate, 0.588N (0.1176M), 4L, Amber GlassSKU: LC200404-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $144.90 Special Price $108.68 -
Boric Acid, 2% w/v Solution, 1 LSKU: B1026-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsBoric Acid, 2% w/v Solution, 1 L (1 per EA)Learn More$19.10 -
Silica Reagent #4, .25 lbSKU: R-1305Q-J-EAManufacturer: Taylor TechnologiesSilica Reagent #4, .25 lb (1 per EA)Learn Morewas $32.77 Special Price $25.03 -
Hydrogen Peroxide, 35 Percent Solution, Technical, 500mL, CAS# 7722-84-1SKU: H1075-500MLPL-CSManufacturer: Spectrum ChemicalHydrogen Peroxide, 35 Percent Solution, Technical - 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. (6 per CS )Learn Morewas $591.60 Special Price $481.39 - Hydroxylamine Hydrochloride 3% W/V, 500ML, Poly BottleSKU: LC155201-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $76.20 Special Price $57.15
- Acetate Buffer pH 4.0, For Chlorine, Iodine, 500ML, Poly BottleSKU: LC100301-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $56.30 Special Price $42.23
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Villella's Etch, 1% / Ethanol, 500.00 mL Glass amberSKU: CV200200-500C-EAManufacturer: Reagents IncVillella's Etch, 1% / Ethanol, 500.00 mL Glass amber (1 per EA )Learn Morewas $128.00 Special Price $98.47 - Sodium Hydroxide, 12.0N (12.0M), 1L, Poly BottleSKU: LC245232-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $112.70 Special Price $86.70
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Buffer Solution, pH 4.01 +/- 0.01 @ 25 DEG C, Reference StandardSKU: B1160-1LTPL-EAManufacturer: Spectrum ChemicalBuffer Solution, pH 4.01 +/- 0.01 @ 25 DEG C, Reference Standard (1 per EA )Learn Morewas $76.45 Special Price $62.21 - Sodium Hydroxide, 0.1N (0.1M) In Meoh, 1L, Poly BottleSKU: LC245502-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: UN1993 (1 per EA)Learn Morewas $98.60 Special Price $75.85
- ZoBell's Solution, ORP Std, 1.00 L Amber polySKU: CZ000100-1B-EAManufacturer: Reagents IncZoBell's Solution, ORP Std, 1.00 L Amber poly (1 per EA )Learn Morewas $105.00 Special Price $80.78
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Silver Nitrate, 0.0171N (0.0171M), 20L, Cubitainer®SKU: LC226205-EAManufacturer: LabChemShelf Life (months): 18, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $794.50 Special Price $595.88 - Acetic Acid, 6% v/v Solution, 3.8 LSKU: A1060-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAcetic Acid, 6% v/v Solution, 3.8 L (1 per EA)Learn More$40.75
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Potassium Iodate-Iodide, 0.0125N (0.002083M), 500ML, Amber PolySKU: LC196601-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $52.40 Special Price $39.30 -
Sulfuric Acid, 50 Percent (v/v) Solution, APHA, 500mL, CAS# 7664-93-9SKU: S-675-500MLGL-EAManufacturer: Spectrum ChemicalSulfuric Acid, 50 Percent (v/v) Solution, APHA is an extremely corrosive acid with dehydrating and oxidizing properties. 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. (1 per EA )Learn Morewas $71.35 Special Price $58.05
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