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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Bromocresol Purple TS - 100mLSKU: TS14063-100ml-EAManufacturer: Dawn ScientificBromocresol Purple TS - 100mL (1 per EA )Learn Morewas $35.62 Special Price $34.73 - Potassium Chromate TS - 500mLSKU: TS14215-500ml-EAManufacturer: Dawn ScientificPotassium Chromate TS - 500mL (1 per EA )Learn Morewas $73.62 Special Price $71.78
- Magnsia Mixture TS - 500mLSKU: TS14150-500ml-EAManufacturer: Dawn ScientificMagnsia Mixture TS - 500mL (1 per EA )Learn Morewas $129.62 Special Price $126.38
- Ammonium Chloride-Ammonium Hydroxide TS - 500mLSKU: TS14037-500ml-EAManufacturer: Dawn ScientificAmmonium Chloride-Ammonium Hydroxide TS - 500mL (1 per EA )Learn Morewas $99.62 Special Price $97.12
- Ninhydrin TS - 500mLSKU: TS14189-500ml-EAManufacturer: Dawn ScientificNinhydrin TS - 500mL (1 per EA )Learn Morewas $199.62 Special Price $194.63
- Phenylhydrazine Acetate TS - 100mLSKU: TS14202-100ml-EAManufacturer: Dawn ScientificPhenylhydrazine Acetate TS - 100mL (1 per EA )Learn Morewas $49.62 Special Price $48.38
- Potassium Pyroantimonate TS - 1LSKU: TS14226-1L-EAManufacturer: Dawn ScientificPotassium Pyroantimonate TS - 1L (1 per EA )Learn Morewas $169.62 Special Price $165.38
- Mercuric Acetate TS - 100mLSKU: TS14155-100ml-EAManufacturer: Dawn ScientificMercuric Acetate TS - 100mL (1 per EA )Learn Morewas $109.62 Special Price $106.88
- Sodium Chloride TS, Alkaline - 100mLSKU: TS14250-100ml-EAManufacturer: Dawn ScientificSodium Chloride TS, Alkaline - 100mL (1 per EA )Learn Morewas $29.62 Special Price $28.88
- Acid Ferrous Sulfate TS - 500mLSKU: TS14007-500ml-EAManufacturer: Dawn ScientificAcid Ferrous Sulfate TS - 500mL (1 per EA )Learn Morewas $79.62 Special Price $77.63
- Sodium Hypochlorite 5% ACS - ACS, 500mL, CAS#7681-52-9SKU: CH8057-500mL-EAManufacturer: Dawn ScientificSodium Hypochlorite 5% ACS - ACS, 500mL, CAS#7681-52-9 (1 per EA )Learn Morewas $47.62 Special Price $46.43
- Sodium Hydroxide TS 3 - 500mLSKU: TS14258-500ml-EAManufacturer: Dawn ScientificSodium Hydroxide TS 3 - 500mL (1 per EA )Learn Morewas $95.62 Special Price $93.23
- Sudan IV TS - 500mLSKU: TS14279-500ml-EAManufacturer: Dawn ScientificSudan IV TS - 500mL (1 per EA )Learn Morewas $164.62 Special Price $160.51
- Cupric Acetate TS - 500mLSKU: TS14081-500ml-EAManufacturer: Dawn ScientificCupric Acetate TS - 500mL (1 per EA )Learn Morewas $159.62 Special Price $155.63
- Locke-Ringer's TS - 500mLSKU: TS14149-500ml-EAManufacturer: Dawn ScientificLocke-Ringer's TS - 500mL (1 per EA )Learn Morewas $164.62 Special Price $160.51
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- Sodium Carbonate TS - 500mLSKU: TS14249-500ml-EAManufacturer: Dawn ScientificSodium Carbonate TS - 500mL (1 per EA )Learn Morewas $65.62 Special Price $63.98
- Starch-Potasssium Iodide TS - 100mLSKU: TS14276-100ml-EAManufacturer: Dawn ScientificStarch-Potasssium Iodide TS - 100mL (1 per EA )Learn Morewas $49.62 Special Price $48.38
- Lanthanum Nitrate TS - 100mLSKU: TS14142-100ml-EAManufacturer: Dawn ScientificLanthanum Nitrate TS - 100mL (1 per EA )Learn Morewas $79.62 Special Price $77.63
- Potassium Hydroxide TS 2, Alcoholic - 100mLSKU: TS14221-100ml-EAManufacturer: Dawn ScientificPotassium Hydroxide TS 2, Alcoholic - 100mL (1 per EA )Learn Morewas $50.62 Special Price $49.36
- Phosphotungstic Acid TS - 500mLSKU: TS14207-500ml-EAManufacturer: Dawn ScientificPhosphotungstic Acid TS - 500mL (1 per EA )Learn Morewas $95.62 Special Price $93.23
- Neutral Red TS - 100mLSKU: TS14187-100ml-EAManufacturer: Dawn ScientificNeutral Red TS - 100mL (1 per EA )Learn Morewas $34.62 Special Price $33.75
- Thymolphthalein TS - 500mLSKU: TS14295-500ml-EAManufacturer: Dawn ScientificThymolphthalein TS - 500mL (1 per EA )Learn Morewas $104.62 Special Price $102.01
- Ferric Ammonium Sulfate TS - 500mLSKU: TS14110-500ml-EAManufacturer: Dawn ScientificFerric Ammonium Sulfate TS - 500mL (1 per EA )Learn Morewas $72.62 Special Price $70.80
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