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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Nitric Acid, 2.0N (2.0M), 1L, Amber GlassSKU: LC178502-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2031 (1 per EA)Learn Morewas $63.60 Special Price $47.70 -
Sodium Hydroxide, 25% w/w, Technical, 5 gal, CubitainerSKU: S1172-5gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSodium Hydroxide, 25% w/w, Technical, 5 gal, Cubitainer (1 per EA )Learn More$75.15 -
Sodium Hydroxide, 50% w/w RGT, 300.00 gal ToteSKU: C1318600-300E3-EAManufacturer: Reagents IncSodium Hydroxide, 50% w/w RGT, 300.00 gal Tote (1 per EA )Learn Morewas $5,780.00 Special Price $4,335.12 -
Grams Iodine Solution100gSKU: G-446-1LTGL-EAManufacturer: Spectrum ChemicalGrams Iodine Solution acts as a mordant for Gram staining technique. It forms an insoluble crystal violet-iodine complex, which imparts purple color to the cells. (1 per EA )Learn Morewas $83.50 Special Price $67.93 - Marble's Reagent (Etch), 1.00 L Glass amberSKU: CM115000-1C-EAManufacturer: Reagents IncMarble's Reagent (Etch), 1.00 L Glass amber (1 per EA )Learn Morewas $112.00 Special Price $84.24
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Hardness Reagent (25 mL sample, 1 drop = 2 ppm hardness as CaCO₃), 16 ozSKU: R-0806-E-EAManufacturer: Taylor TechnologiesHardness Reagent (25 mL sample, 1 drop = 2 ppm hardness as CaCO₃), 16 oz (1 per EA)Learn Morewas $26.66 Special Price $20.36 - Trivalent Chromium 1.00 oz/gal, 100.00 mL Glass clearSKU: CT031300-100D1-EAManufacturer: Reagents IncTrivalent Chromium 1.00 oz/gal, 100.00 mL Glass clear (1 per EA )Learn Morewas $132.00 Special Price $101.55
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Buffer Solution pH 9.0, 16 ozSKU: R-1099-09-E-EAManufacturer: Taylor TechnologiesBuffer Solution pH 9.0, 16 oz (1 per EA)Learn Morewas $27.54 Special Price $21.04 -
Triketohydrindene Hydrate TS (Ninhydrin TS) - 500mLSKU: TS14299-500ml-EAManufacturer: Dawn ScientificTriketohydrindene Hydrate TS (Ninhydrin TS) - 500mL (1 per EA )Learn Morewas $109.62 Special Price $106.88 -
Hydrochloric Acid .12N, 2 oz, Dropper BottleSKU: R-0724-C-EAManufacturer: Taylor TechnologiesHydrochloric Acid .12N, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $11.54 Special Price $8.82 -
ChloropHenol Red 0.04% (Aq), 125ML, Amber GlassSKU: LC130807-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $30.50 Special Price $22.87 -
Buffer Solution pH 4.0, galSKU: R-1099-04-G-EAManufacturer: Taylor TechnologiesBuffer Solution pH 4.0, gal (1 per EA)Learn Morewas $68.04 Special Price $51.97 -
CAN Solution (5 mL sample, 1 drop = 40 ppm NaNO₂), 16 ozSKU: R-0820-E-EAManufacturer: Taylor TechnologiesCAN Solution (5 mL sample, 1 drop = 40 ppm NaNO₂), 16 oz (1 per EA)Learn Morewas $59.53 Special Price $45.47 -
Sodium Hydroxide, 0.2N (0.2M), 500ML, Poly BottleSKU: LC242801-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $32.60 Special Price $25.08 -
Hydroxylamine Reagent, 2 ozSKU: R-1306E-C-EAManufacturer: Taylor TechnologiesHydroxylamine Reagent, 2 oz (1 per EA)Learn Morewas $33.88 Special Price $25.88 - Saline TS, Pyrogen-Free - 100mLSKU: TS14236-100ml-EAManufacturer: Dawn ScientificSaline TS, Pyrogen-Free - 100mL (1 per EA )Learn Morewas $39.62 Special Price $38.63
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Vario Alkaline-Cyanide Reagent Solution 100 ML, Ea/1SKU: 530621-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2122332. Lovibond Vario Alkaline-Cyanide Reagent Solution, 100 ml (1 per EA)Learn More$38.20 - Ammonium Hydroxide, 1.0N (1.0M), 500ML, Poly BottleSKU: LC110801-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $56.50 Special Price $42.38
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Potassium Iodide, 20 Percent (w/v) Aqueous Solution, 500mL, CAS# 7681-11-0SKU: P-433-500MLGL-EAManufacturer: Spectrum ChemicalPotassium Iodide, 20 Percent (w/v) 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 Morewas $102.75 Special Price $83.60 -
Sodium Sulfate 22.2% W/V, 1L, Poly BottleSKU: LC249002-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $64.10 Special Price $49.31 -
Hydrochloric Acid Concentrated, 16 oz (GL)SKU: R-0616-E-EAManufacturer: Taylor TechnologiesHydrochloric Acid Concentrated, 16 oz (GL) (1 per EA )Learn Morewas $65.97 Special Price $59.02 -
Toluidine Blue O Indicator, .75 oz, Dropper BottleSKU: R-0881-A-EAManufacturer: Taylor TechnologiesToluidine Blue O Indicator, .75 oz, Dropper Bottle (1 per EA)Learn Morewas $20.30 Special Price $15.51 - Hydrogen Peroxide, 50 Percent, Solution, Reagent, 100mL, CAS# 7722-84-1SKU: H1077-100ML-EAManufacturer: Spectrum ChemicalHydrogen Peroxide, 50 Percent, Solution, Reagent - 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 $156.30 Special Price $127.17
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Perchloric Acid, 0.1 N Solution in Glacial Acetic Acid, (USP Volumetric Solution)SKU: P-107-1LT-EAManufacturer: Spectrum ChemicalPerchloric Acid, 0.1 N Solution in Glacial Acetic Acid, (USP Volumetric Solution) is an inorganic acid dissolved in an organic solvent. It's main characteristic is that it is stronger than both sulfuric and nitric acid. It is also used for its super acid properties and also as an etchant for certain metals. (1 per EA )Learn Morewas $194.40 Special Price $158.19
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