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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Hardness Reagent (25 mL sample, 1 drop = 2 ppm hardness as CaCO₃), 2 oz, Dropper BottleSKU: R-0806-C-EAManufacturer: Taylor TechnologiesHardness Reagent (25 mL sample, 1 drop = 2 ppm hardness as CaCO₃), 2 oz, Dropper Bottle (1 per EA)Learn Morewas $12.53 Special Price $0.09 -
High Iron Reagent #1, 2 ozSKU: R-0673-C-EAManufacturer: Taylor TechnologiesHigh Iron Reagent #1, 2 oz (1 per EA)Learn Morewas $31.26 Special Price $23.88 -
Thiocarbamate Reagent, .75 oz, Dropper BottleSKU: R-0643-A-EAManufacturer: Taylor TechnologiesThiocarbamate Reagent, .75 oz, Dropper Bottle (1 per EA)Learn Morewas $12.31 Special Price $9.40 -
Permanganate Reagent (25 mL sample, 1 drop = 50 ppm NaNO₂), 16 ozSKU: R-0733-E-EAManufacturer: Taylor TechnologiesPermanganate Reagent (25 mL sample, 1 drop = 50 ppm NaNO₂), 16 oz (1 per EA)Learn Morewas $51.10 Special Price $39.04 -
Permanganate Reagent (25 mL sample, 1 drop = 50 ppm NaNO₂), 32 ozSKU: R-0733-F-EAManufacturer: Taylor TechnologiesPermanganate Reagent (25 mL sample, 1 drop = 50 ppm NaNO₂), 32 oz (1 per EA)Learn Morewas $84.95 Special Price $64.89 -
Permanganate Reagent (25 mL sample, 1 drop = 50 ppm NaNO₂), 2 ozSKU: R-0733-C-EAManufacturer: Taylor TechnologiesPermanganate Reagent (25 mL sample, 1 drop = 50 ppm NaNO₂), 2 oz (1 per EA)Learn Morewas $11.83 Special Price $9.04 -
Midget, Iron, 0-2.0 ppmSKU: 5112-EAManufacturer: Taylor TechnologiesMidget, Iron, 0-2.0 ppm (1 per EA )Learn Morewas $0.91 Special Price $0.82 - Slide, Ozone DPD, 0-0.66 or 0-2.0 ppmSKU: 5570-EAManufacturer: Taylor TechnologiesSlide, Ozone DPD, 0-0.66 or 0-2.0 ppm (1 per EA )Learn Morewas $1.04 Special Price $0.93
- Midget, Chlorine OT, 5-250 ppmSKU: 5521-EAManufacturer: Taylor TechnologiesMidget, Chlorine OT, 5-250 ppm (1 per EA )Learn Morewas $1.04 Special Price $0.93
- Slide, Bromine DPD, 2.0-10 ppmSKU: 5517-EAManufacturer: Taylor TechnologiesSlide, Bromine DPD, 2.0-10 ppm (1 per EA )Learn Morewas $1.04 Special Price $0.93
- Thiosulfate Reagent .75oz DBSKU: R-0774-A-EAManufacturer: Taylor TechnologiesThiosulfate Reagent .75oz DB (1 per EA)Learn Morewas $15.71 Special Price $12.00
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Hardness Reagent .001M, galSKU: R-0920-G-EAManufacturer: Taylor TechnologiesHardness Reagent .001M, gal (1 per EA)Learn Morewas $100.73 Special Price $0.10 -
- Caustic Solution, 2 ozSKU: R-0940-C-EAManufacturer: Taylor TechnologiesCaustic Solution, 2 oz (1 per EA)Learn Morewas $32.70 Special Price $24.99
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Silver Nitrate N/58.4, 16 ozSKU: R-0629-58-E-EAManufacturer: Taylor TechnologiesSilver Nitrate N/58.4, 16 oz (1 per EA)Learn Morewas $47.30 Special Price $36.14 - Slide, Chlorine OT, 0-50 ppmSKU: 5154-EAManufacturer: Taylor TechnologiesSlide, Chlorine OT, 0-50 ppm (1 per EA )Learn Morewas $0.91 Special Price $0.82
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Iodide Iodate N/40, 32 ozSKU: R-0633-40-F-EAManufacturer: Taylor TechnologiesIodide Iodate N/40, 32 oz (1 per EA)Learn Morewas $34.31 Special Price $26.21 -
Free Polymer Reagent #2, 2 ozSKU: R-0831-C-EAManufacturer: Taylor TechnologiesFree Polymer Reagent #2, 2 oz (1 per EA)Learn Morewas $45.12 Special Price $34.47 -
Iron #1, 10 gSKU: R-0965-I-EAManufacturer: Taylor TechnologiesIron #1, 10 g (1 per EA)Learn Morewas $49.02 Special Price $37.44 - Acid Solution, 2 ozSKU: R-0942-C-EAManufacturer: Taylor TechnologiesAcid Solution, 2 oz (1 per EA)Learn Morewas $34.42 Special Price $26.29
- Midget, Copper, 0.2-3.0 ppmSKU: 5119-EAManufacturer: Taylor TechnologiesMidget, Copper, 0.2-3.0 ppm (1 per EA )Learn Morewas $0.67 Special Price $0.59
- Slide, Nitrate, 0-10 ppmSKU: 5758-EAManufacturer: Taylor TechnologiesSlide, Nitrate, 0-10 ppm (1 per EA )Learn Morewas $0.91 Special Price $0.37
- Slide, Copper, 0-3.0 ppmSKU: 5144-EAManufacturer: Taylor TechnologiesSlide, Copper, 0-3.0 ppm (1 per EA )Learn Morewas $0.91 Special Price $0.82
- Slide, Chlorine DPD-free, combined, totalSKU: 5157-EAManufacturer: Taylor TechnologiesSlide, Chlorine DPD-free, combined, total (1 per EA )Learn Morewas $1.04 Special Price $0.93
- Manufacturer Taylor Technologies Remove This Item
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