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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Sodium Hypochlorite 12.5-15% - 1Gal, CAS#7681-52-9SKU: CH8056-1Gal-EAManufacturer: Dawn ScientificSodium Hypochlorite 12.5-15% - 1Gal, CAS#7681-52-9 (1 per EA )Learn Morewas $119.62 Special Price $116.63 - Sodium Hypochlorite 5% ACS - ACS, 1L, CAS#7681-52-9SKU: CH8057-1L-EAManufacturer: Dawn ScientificSodium Hypochlorite 5% ACS - ACS, 1L, CAS#7681-52-9 (1 per EA )Learn Morewas $52.62 Special Price $51.30
- Phloroglucinal TS - 500mLSKU: TS14204-500ml-EAManufacturer: Dawn ScientificPhloroglucinal TS - 500mL (1 per EA )Learn Morewas $65.62 Special Price $63.98
- Xylenol Orange TS - 100mLSKU: TS14302-100ml-EAManufacturer: Dawn ScientificXylenol Orange TS - 100mL (1 per EA )Learn Morewas $59.62 Special Price $58.13
- Thymol Blue TS - 100mLSKU: TS14294-100ml-EAManufacturer: Dawn ScientificThymol Blue TS - 100mL (1 per EA )Learn Morewas $61.62 Special Price $60.08
- Potassium Iodide TS - 500mLSKU: TS14222-500ml-EAManufacturer: Dawn ScientificPotassium Iodide TS - 500mL (1 per EA )Learn Morewas $94.62 Special Price $92.25
- Ammonium Phosphate, Dibasic, TS - 500mLSKU: TS14040-500ml-EAManufacturer: Dawn ScientificAmmonium Phosphate, Dibasic, TS - 500mL (1 per EA )Learn Morewas $84.62 Special Price $82.50
- Diluted Lead Subacetate TS - 500mLSKU: TS14098-500ml-EAManufacturer: Dawn ScientificDiluted Lead Subacetate TS - 500mL (1 per EA )Learn Morewas $129.62 Special Price $126.38
- Ammonium Thiocyanate TS - 500mLSKU: TS14045-500ml-EAManufacturer: Dawn ScientificAmmonium Thiocyanate TS - 500mL (1 per EA )Learn Morewas $55.62 Special Price $54.23
- Sodium Fluoride TS - 500mLSKU: TS14254-500ml-EAManufacturer: Dawn ScientificSodium Fluoride TS - 500mL (1 per EA )Learn Morewas $119.62 Special Price $116.63
- Sulfanilic Acid TS - 100mLSKU: TS14280-100ml-EAManufacturer: Dawn ScientificSulfanilic Acid TS - 100mL (1 per EA )Learn Morewas $42.62 Special Price $41.56
- Ammonium Oxalate TS - 500mLSKU: TS14039-500ml-EAManufacturer: Dawn ScientificAmmonium Oxalate TS - 500mL (1 per EA )Learn Morewas $57.62 Special Price $56.18
- Diiodofluorescein TS - 100mLSKU: TS14097-100ml-EAManufacturer: Dawn ScientificDiiodofluorescein TS - 100mL (1 per EA )Learn Morewas $69.62 Special Price $67.88
- Diluted Lead Subacetate TS - 1LSKU: TS14098-1L-EAManufacturer: Dawn ScientificDiluted Lead Subacetate TS - 1L (1 per EA )Learn Morewas $244.62 Special Price $238.51
- Sodium Hypochlorite 5% ACS - ACS, 1Gal, CAS#7681-52-9SKU: CH8057-1Gal-EAManufacturer: Dawn ScientificSodium Hypochlorite 5% ACS - ACS, 1Gal, CAS#7681-52-9 (1 per EA )Learn Morewas $109.62 Special Price $106.88
- Acetone, Buffer, TS - 1LSKU: TS14005-1L-EAManufacturer: Dawn ScientificAcetone, Buffer, TS - 1L (1 per EA )Learn Morewas $129.62 Special Price $126.38
- Starch-Potasssium Iodide TS - 500mLSKU: TS14276-500ml-EAManufacturer: Dawn ScientificStarch-Potasssium Iodide TS - 500mL (1 per EA )Learn Morewas $139.62 Special Price $136.13
- Potassium Acetate TS - 500mLSKU: TS14212-500ml-EAManufacturer: Dawn ScientificPotassium Acetate TS - 500mL (1 per EA )Learn Morewas $119.62 Special Price $116.63
- Phenolphthalein TS - 500mLSKU: TS14201-500ml-EAManufacturer: Dawn ScientificPhenolphthalein TS - 500mL (1 per EA )Learn Morewas $48.62 Special Price $47.40
- Bromocresol Green TS - 100mLSKU: TS14061-100ml-EAManufacturer: Dawn ScientificBromocresol Green TS - 100mL (1 per EA )Learn Morewas $29.62 Special Price $28.88
- Potassium Carbonate TS - 500mLSKU: TS14214-500ml-EAManufacturer: Dawn ScientificPotassium Carbonate TS - 500mL (1 per EA )Learn Morewas $99.62 Special Price $97.12
- Bromocresol Green TS - 500mLSKU: TS14061-500ml-EAManufacturer: Dawn ScientificBromocresol Green TS - 500mL (1 per EA )Learn Morewas $45.62 Special Price $44.47
- Acetic Acid, strong, TS - 500mLSKU: TS14003-500ml-EAManufacturer: Dawn ScientificAcetic Acid, strong, TS - 500mL (1 per EA )Learn Morewas $69.62 Special Price $67.88
- Quinone TS - 500mLSKU: TS14232-500ml-EAManufacturer: Dawn ScientificQuinone TS - 500mL (1 per EA )Learn Morewas $144.62 Special Price $141.00
- Manufacturer Dawn Scientific Remove This Item
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