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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Cupric Citrate TS (Barfoed's Reagent) - 500mLSKU: TS14084-500ml-EAManufacturer: Dawn ScientificCupric Citrate TS (Barfoed's Reagent) - 500mL (1 per EA )Learn Morewas $99.62 Special Price $97.12 - Bromothymol Blue TS - 100mLSKU: TS14065-100ml-EAManufacturer: Dawn ScientificBromothymol Blue TS - 100mL (1 per EA )Learn Morewas $49.62 Special Price $48.38
- Chromotropic Acid TS - 100mLSKU: TS14073-100ml-EAManufacturer: Dawn ScientificChromotropic Acid TS - 100mL (1 per EA )Learn Morewas $104.62 Special Price $102.01
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- Potassium Iodide and Starch TS - 500mLSKU: TS14223-500ml-EAManufacturer: Dawn ScientificPotassium Iodide and Starch TS - 500mL (1 per EA )Learn Morewas $149.62 Special Price $145.88
- Cupric Acetate TS - 100mLSKU: TS14081-100ml-EAManufacturer: Dawn ScientificCupric Acetate TS - 100mL (1 per EA )Learn Morewas $59.62 Special Price $58.13
- Cresol Red-Thymol blue TS - 100mLSKU: TS14079-100ml-EAManufacturer: Dawn ScientificCresol Red-Thymol blue TS - 100mL (1 per EA )Learn Morewas $34.62 Special Price $33.75
- Mercuric-Potassium Iodide TS (Mayer's Reagent) - 1LSKU: TS14161-1L-EAManufacturer: Dawn ScientificMercuric-Potassium Iodide TS (Mayer's Reagent) - 1L (1 per EA )Learn Morewas $119.62 Special Price $116.63
- Sodium Tartrate TS - 100mLSKU: TS14266-100ml-EAManufacturer: Dawn ScientificSodium Tartrate TS - 100mL (1 per EA )Learn Morewas $44.62 Special Price $43.50
- Alkaline Cupric Iodide TS - 100mLSKU: TS14018-100ml-EAManufacturer: Dawn ScientificAlkaline Cupric Iodide TS - 100mL (1 per EA )Learn Morewas $94.62 Special Price $92.25
- Cresol Red-Thymol blue TS - 500mLSKU: TS14079-500ml-EAManufacturer: Dawn ScientificCresol Red-Thymol blue TS - 500mL (1 per EA )Learn Morewas $89.62 Special Price $87.38
- Cupric-Ammonium Sulfate TS - 500mLSKU: TS14083-500ml-EAManufacturer: Dawn ScientificCupric-Ammonium Sulfate TS - 500mL (1 per EA )Learn Morewas $119.62 Special Price $116.63
- Acid Ferrous Sulfate TS - 100mLSKU: TS14007-100ml-EAManufacturer: Dawn ScientificAcid Ferrous Sulfate TS - 100mL (1 per EA )Learn Morewas $39.62 Special Price $38.63
- Ferric Chloride TS - 500mLSKU: TS14111-500ml-EAManufacturer: Dawn ScientificFerric Chloride TS - 500mL (1 per EA )Learn Morewas $74.62 Special Price $72.76
- Quinaldine Red TS - 1LSKU: TS14231-1L-EAManufacturer: Dawn ScientificQuinaldine Red TS - 1L (1 per EA )Learn Morewas $194.62 Special Price $189.76
- Potassium Acetate TS - 100mLSKU: TS14212-100ml-EAManufacturer: Dawn ScientificPotassium Acetate TS - 100mL (1 per EA )Learn Morewas $59.62 Special Price $58.13
- Alkaline Cupric Iodide TS - 500mLSKU: TS14018-500ml-EAManufacturer: Dawn ScientificAlkaline Cupric Iodide TS - 500mL (1 per EA )Learn Morewas $194.62 Special Price $189.76
- Mercuric Acetate TS - 500mLSKU: TS14155-500ml-EAManufacturer: Dawn ScientificMercuric Acetate TS - 500mL (1 per EA )Learn Morewas $199.62 Special Price $194.63
- Diphenylarbazone TS - 500mLSKU: TS14102-500ml-EAManufacturer: Dawn ScientificDiphenylarbazone TS - 500mL (1 per EA )Learn Morewas $95.62 Special Price $93.23
- Hydroxylamine Hydrochloride TS - 1LSKU: TS14126-1L-EAManufacturer: Dawn ScientificHydroxylamine Hydrochloride TS - 1L (1 per EA )Learn Morewas $234.62 Special Price $228.75
- Cobaltous Chloride TS - 500mLSKU: TS14075-500ml-EAManufacturer: Dawn ScientificCobaltous Chloride TS - 500mL (1 per EA )Learn Morewas $189.62 Special Price $184.87
- Lanthanum Nitrate TS - 1LSKU: TS14142-1L-EAManufacturer: Dawn ScientificLanthanum Nitrate TS - 1L (1 per EA )Learn Morewas $274.62 Special Price $267.75
- Mercuric-Ammonium Thiocyanate TS - 1LSKU: TS14156-1L-EAManufacturer: Dawn ScientificMercuric-Ammonium Thiocyanate TS - 1L (1 per EA )Learn Morewas $294.62 Special Price $287.26
- Mercuric-Potassium Iodide TS, Alkalin (Nessler's Reagent) - 1LSKU: TS14186-1L-EAManufacturer: Dawn ScientificMercuric-Potassium Iodide TS, Alkalin (Nessler's Reagent) - 1L (1 per EA )Learn Morewas $149.62 Special Price $145.88
- Manufacturer Dawn Scientific Remove This Item
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