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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pH Soaker Solution, 16 ozSKU: R-0834-E-EAManufacturer: Taylor TechnologiespH Soaker Solution, 16 oz (1 per EA)Learn Morewas $79.56 Special Price $60.78 -
Iodide Iodate Reagent (25 mL sample, 1 drop = 10 ppm SO₃), 2 oz, Dropper BottleSKU: R-0817-C-EAManufacturer: Taylor TechnologiesIodide Iodate Reagent (25 mL sample, 1 drop = 10 ppm SO₃), 2 oz, Dropper Bottle (1 per EA )Learn Morewas $17.84 Special Price $15.96 -
Sulfuric Acid N, 32 ozSKU: R-0686-F-EAManufacturer: Taylor TechnologiesSulfuric Acid N, 32 oz (1 per EA)Learn Morewas $44.31 Special Price $33.85 -
Bleach Reagent #1, 2 ozSKU: R-0664-C-EAManufacturer: Taylor TechnologiesBleach Reagent #1, 2 oz (1 per EA)Learn Morewas $27.27 Special Price $20.83 -
Iodide Iodate Reagent (25 mL sample, 1 drop = 10 ppm SO₃), 16 ozSKU: R-0817-E-EAManufacturer: Taylor TechnologiesIodide Iodate Reagent (25 mL sample, 1 drop = 10 ppm SO₃), 16 oz (1 per EA )Learn Morewas $37.88 Special Price $33.89 -
DPD Reagent #3, 2 oz, Dropper BottleSKU: R-0003-C-EAManufacturer: Taylor TechnologiesDPD Reagent #3, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $15.03 Special Price $11.49 -
Free Polymer Reagent #2, 16 ozSKU: R-0831-E-EAManufacturer: Taylor TechnologiesFree Polymer Reagent #2, 16 oz (1 per EA)Learn Morewas $108.47 Special Price $82.86 -
Starch Indicator Solution, galSKU: R-0636-G-EAManufacturer: Taylor TechnologiesStarch Indicator Solution, gal (1 per EA)Learn Morewas $178.86 Special Price $136.63 -
Total Chelant Titrating Solution, 2 oz, Dropper BottleSKU: R-0912-C-EAManufacturer: Taylor TechnologiesTotal Chelant Titrating Solution, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $37.86 Special Price $28.92 -
Long Range Indicator, 2 oz, Dropper BottleSKU: R-1003U-C-DB-EAManufacturer: Taylor TechnologiesLong Range Indicator, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $15.34 Special Price $11.72 -
Hardness Reagent A (odorless buffer), 2 oz w/ blue cap, Dropper BottleSKU: R-0614-C-EAManufacturer: Taylor TechnologiesHardness Reagent A (odorless buffer), 2 oz w/ blue cap, Dropper Bottle (1 per EA)Learn Morewas $24.28 Special Price $18.54 -
Iron Reagent #2, 2 ozSKU: R-0852-C-EAManufacturer: Taylor TechnologiesIron Reagent #2, 2 oz (1 per EA)Learn Morewas $14.93 Special Price $11.40 -
Molybdate Reagent, gal, 4-packSKU: R-0601-G-4-PKManufacturer: Taylor TechnologiesMolybdate Reagent, gal, 4-pack (4 per PK )Learn Morewas $374.40 Special Price $334.95 -
NTA Buffer Solution 2ozSKU: R-0878-C-EAManufacturer: Taylor TechnologiesNTA Buffer Solution 2oz (1 per EA)Learn Morewas $24.27 Special Price $18.54 -
Hardness Reagent .01M, galSKU: R-0618-G-EAManufacturer: Taylor TechnologiesHardness Reagent .01M, gal (1 per EA)Learn Morewas $51.90 Special Price $39.65 -
Copper Reagent #1, .75 ozSKU: R-0860-A-EAManufacturer: Taylor TechnologiesCopper Reagent #1, .75 oz (1 per EA)Learn Morewas $9.38 Special Price $7.17 -
Sulfuric Acid .12N, 2 oz w/ green cap, Dropper BottleSKU: R-0687G-C-EAManufacturer: Taylor TechnologiesSulfuric Acid .12N, 2 oz w/ green cap, Dropper Bottle (1 per EA)Learn Morewas $9.07 Special Price $6.93 -
DPD Reagent #3, .75 oz, Dropper BottleSKU: R-0003-A-EAManufacturer: Taylor TechnologiesDPD Reagent #3, .75 oz, Dropper Bottle (1 per EA)Learn Morewas $7.04 Special Price $0.09 -
Silver Nitrate Reagent (25 mL sample, 1 drop = 10 ppm Clˉ), 16 ozSKU: R-0706-E-EAManufacturer: Taylor TechnologiesSilver Nitrate Reagent (25 mL sample, 1 drop = 10 ppm Clˉ), 16 oz (1 per EA)Learn Morewas $115.76 Special Price $88.43 -
Chromate Indicator, 16 ozSKU: R-0630-E-EAManufacturer: Taylor TechnologiesChromate Indicator, 16 oz (1 per EA)Learn Morewas $25.02 Special Price $19.11 -
Mercuric Nitrate Titrating Solution, 2 oz, Dropper BottleSKU: R-0845-C-EAManufacturer: Taylor TechnologiesMercuric Nitrate Titrating Solution, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $30.74 Special Price $23.49 -
Copper Reagent #2, .75 ozSKU: R-0861-A-EAManufacturer: Taylor TechnologiesCopper Reagent #2, .75 oz (1 per EA)Learn Morewas $9.83 Special Price $7.51 -
Iodide Iodate Reagent (25 mL sample, 1 drop = 2 ppm Na₂SO₃), 2 oz, Dropper BottleSKU: R-0808-C-EAManufacturer: Taylor TechnologiesIodide Iodate Reagent (25 mL sample, 1 drop = 2 ppm Na₂SO₃), 2 oz, Dropper Bottle (1 per EA)Learn Morewas $10.39 Special Price $7.93 -
Sulfuric Acid Reagent, 16 ozSKU: R-0691-E-EAManufacturer: Taylor TechnologiesSulfuric Acid Reagent, 16 oz (1 per EA)Learn Morewas $65.73 Special Price $50.21
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