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
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Buffers and Solutions
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Ammonium Chloride-Ammonium Hydroxide TS - 1LSKU: TS14037-1L-EAManufacturer: Dawn ScientificAmmonium Chloride-Ammonium Hydroxide TS - 1L (1 per EA )Learn Morewas $189.62 Special Price $184.87 - Ammonium Vanadate TS - 1LSKU: TS14046-1L-EAManufacturer: Dawn ScientificAmmonium Vanadate TS - 1L (1 per EA )Learn Morewas $149.62 Special Price $145.88
- Calcium Hydroxide TS - 1LSKU: TS14068-1L-EAManufacturer: Dawn ScientificCalcium Hydroxide TS - 1L (1 per EA )Learn Morewas $149.62 Special Price $145.88
- Cupric Citrate TS (Barfoed's Reagent) - 1LSKU: TS14084-1L-EAManufacturer: Dawn ScientificCupric Citrate TS (Barfoed's Reagent) - 1L (1 per EA )Learn Morewas $189.62 Special Price $184.87
- Ferrous Sulfate TS - 1LSKU: TS14113-1L-EAManufacturer: Dawn ScientificFerrous Sulfate TS - 1L (1 per EA )Learn Morewas $179.62 Special Price $175.13
- HCl, Diluted - 100mLSKU: TS14416-100ml-EAManufacturer: Dawn ScientificHCl, Diluted - 100mL (1 per EA )Learn Morewas $59.62 Special Price $58.13
- Methyl Violet TS - 100mLSKU: TS14173-100ml-EAManufacturer: Dawn ScientificMethyl Violet TS - 100mL (1 per EA )Learn Morewas $54.62 Special Price $53.25
- Magnsium Sulfate TS - 100mLSKU: TS14151-100ml-EAManufacturer: Dawn ScientificMagnsium Sulfate TS - 100mL (1 per EA )Learn Morewas $37.62 Special Price $36.68
- Bromomethyl Blue TS - 100mLSKU: TS14410-100ml-EAManufacturer: Dawn ScientificBromomethyl Blue TS - 100mL (1 per EA )Learn Morewas $34.62 Special Price $33.75
- Diphenylarbazone TS - 100mLSKU: TS14102-100ml-EAManufacturer: Dawn ScientificDiphenylarbazone TS - 100mL (1 per EA )Learn Morewas $54.62 Special Price $53.25
- Methyl Purple TS - 500mLSKU: TS14168-500ml-EAManufacturer: Dawn ScientificMethyl Purple TS - 500mL (1 per EA )Learn Morewas $114.62 Special Price $111.76
- Methoxyphenylacetic TS - 100mLSKU: TS14166-100ml-EAManufacturer: Dawn ScientificMethoxyphenylacetic TS - 100mL (1 per EA )Learn Morewas $69.62 Special Price $67.88
- Methyl Red TS 2 - 500mLSKU: TS14170-500ml-EAManufacturer: Dawn ScientificMethyl Red TS 2 - 500mL (1 per EA )Learn Morewas $134.62 Special Price $131.25
- Methyl Yellow-Methylene Blue TS - 100mLSKU: TS14175-100ml-EAManufacturer: Dawn ScientificMethyl Yellow-Methylene Blue TS - 100mL (1 per EA )Learn Morewas $59.62 Special Price $58.13
- Erichrome Cyanine TS - 100mLSKU: TS14108-100ml-EAManufacturer: Dawn ScientificErichrome Cyanine TS - 100mL (1 per EA )Learn Morewas $45.62 Special Price $44.47
- Formaldehyde TS - 500mLSKU: TS14116-500ml-EAManufacturer: Dawn ScientificFormaldehyde TS - 500mL (1 per EA )Learn Morewas $99.62 Special Price $97.12
- Methyl Violet TS - 500mLSKU: TS14173-500ml-EAManufacturer: Dawn ScientificMethyl Violet TS - 500mL (1 per EA )Learn Morewas $139.62 Special Price $136.13
- Bromocresol Gren-Methyl Red TS - 100mLSKU: TS14062-100ml-EAManufacturer: Dawn ScientificBromocresol Gren-Methyl Red TS - 100mL (1 per EA )Learn Morewas $34.62 Special Price $33.75
- Sodium Hydroxide TS 2 - 500mLSKU: TS14257-500ml-EAManufacturer: Dawn ScientificSodium Hydroxide TS 2 - 500mL (1 per EA )Learn Morewas $89.62 Special Price $87.38
- Bromocresol Gren-Methyl Red TS - 500mLSKU: TS14062-500ml-EAManufacturer: Dawn ScientificBromocresol Gren-Methyl Red TS - 500mL (1 per EA )Learn Morewas $99.62 Special Price $97.12
- Sodium Alizarinsulfonate TS - 500mLSKU: TS14245-500ml-EAManufacturer: Dawn ScientificSodium Alizarinsulfonate TS - 500mL (1 per EA )Learn Morewas $114.62 Special Price $111.76
- Methyl Red TS 2 - 100mLSKU: TS14170-100ml-EAManufacturer: Dawn ScientificMethyl Red TS 2 - 100mL (1 per EA )Learn Morewas $54.62 Special Price $53.25
- Acetonitrile (with 0.1% TFA) HPLC - 4X4LSKU: LC9893-4x4L-CSManufacturer: Dawn ScientificAcetonitrile (with 0.1% TFA) HPLC - 4X4L (4 per CS )Learn Morewas $629.62 Special Price $613.88
- Acetonitrile : Water 50:50 Ratio HPLC - 4X4LSKU: LC9896-4x4L-CSManufacturer: Dawn ScientificAcetonitrile : Water 50:50 Ratio HPLC - 4X4L (4 per CS )Learn Morewas $499.62 Special Price $487.13
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