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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Methyl Red-Methylene Blue TS - 1LSKU: TS14172-1L-EAManufacturer: Dawn ScientificMethyl Red-Methylene Blue TS - 1L (1 per EA )Learn Morewas $169.62 Special Price $165.38 - Methylene Blue TS - 1LSKU: TS14177-1L-EAManufacturer: Dawn ScientificMethylene Blue TS - 1L (1 per EA )Learn Morewas $154.62 Special Price $150.76
- Neutral Red TS - 1LSKU: TS14187-1L-EAManufacturer: Dawn ScientificNeutral Red TS - 1L (1 per EA )Learn Morewas $104.62 Special Price $102.01
- Oxalic Acid TS - 1LSKU: TS14194-1L-EAManufacturer: Dawn ScientificOxalic Acid TS - 1L (1 per EA )Learn Morewas $89.62 Special Price $87.38
- Phenolphthalein TS - 1LSKU: TS14201-1L-EAManufacturer: Dawn ScientificPhenolphthalein TS - 1L (1 per EA )Learn Morewas $92.62 Special Price $90.31
- Phenylhydrazine-Sulfuric Acid TS - 1LSKU: TS14203-1L-EAManufacturer: Dawn ScientificPhenylhydrazine-Sulfuric Acid TS - 1L (1 per EA )Learn Morewas $124.62 Special Price $121.50
- Phosphotungstic Acid TS - 1LSKU: TS14207-1L-EAManufacturer: Dawn ScientificPhosphotungstic Acid TS - 1L (1 per EA )Learn Morewas $184.62 Special Price $180.00
- Potassium Carbonate TS - 1LSKU: TS14214-1L-EAManufacturer: Dawn ScientificPotassium Carbonate TS - 1L (1 per EA )Learn Morewas $179.62 Special Price $175.13
- Potassium Dichromate TS - 1LSKU: TS14216-1L-EAManufacturer: Dawn ScientificPotassium Dichromate TS - 1L (1 per EA )Learn Morewas $169.62 Special Price $165.38
- Potassium Ferricyanide TS - 1LSKU: TS14217-1L-EAManufacturer: Dawn ScientificPotassium Ferricyanide TS - 1L (1 per EA )Learn Morewas $159.62 Special Price $155.63
- Potassium Ferrocyanide TS - 1LSKU: TS14218-1L-EAManufacturer: Dawn ScientificPotassium Ferrocyanide TS - 1L (1 per EA )Learn Morewas $164.62 Special Price $160.51
- Potassium Hydroxide TS - 1LSKU: TS14219-1L-EAManufacturer: Dawn ScientificPotassium Hydroxide TS - 1L (1 per EA )Learn Morewas $84.62 Special Price $82.50
- Potassium Hydroxide TS, Alcoholic - 1LSKU: TS14220-1L-EAManufacturer: Dawn ScientificPotassium Hydroxide TS, Alcoholic - 1L (1 per EA )Learn Morewas $135.62 Special Price $132.22
- Sodium Alizarinsulfonate TS - 1LSKU: TS14245-1L-EAManufacturer: Dawn ScientificSodium Alizarinsulfonate TS - 1L (1 per EA )Learn Morewas $194.62 Special Price $189.76
- Sodium Carbonate TS - 1LSKU: TS14249-1L-EAManufacturer: Dawn ScientificSodium Carbonate TS - 1L (1 per EA )Learn Morewas $104.62 Special Price $102.01
- Sodium Chloride TS, Alkaline - 1LSKU: TS14250-1L-EAManufacturer: Dawn ScientificSodium Chloride TS, Alkaline - 1L (1 per EA )Learn Morewas $82.62 Special Price $80.56
- Sodium Citrate TS - 1LSKU: TS14251-1L-EAManufacturer: Dawn ScientificSodium Citrate TS - 1L (1 per EA )Learn Morewas $169.62 Special Price $165.38
- Sodium Citrate TS, Alkaline - 1LSKU: TS14252-1L-EAManufacturer: Dawn ScientificSodium Citrate TS, Alkaline - 1L (1 per EA )Learn Morewas $185.62 Special Price $180.98
- Sodium Hydroxide TS 2 - 1LSKU: TS14257-1L-EAManufacturer: Dawn ScientificSodium Hydroxide TS 2 - 1L (1 per EA )Learn Morewas $154.62 Special Price $150.76
- Sodium Hydroxide TS 3 - 1LSKU: TS14258-1L-EAManufacturer: Dawn ScientificSodium Hydroxide TS 3 - 1L (1 per EA )Learn Morewas $179.62 Special Price $175.13
- Dibasic Sodium Phosphate TS - 1LSKU: TS14263-1L-EAManufacturer: Dawn ScientificDibasic Sodium Phosphate TS - 1L (1 per EA )Learn Morewas $144.62 Special Price $141.00
- Sodium Tartrate TS - 1LSKU: TS14266-1L-EAManufacturer: Dawn ScientificSodium Tartrate TS - 1L (1 per EA )Learn Morewas $194.62 Special Price $189.76
- Sodium Tetraphenylboron TS - 1LSKU: TS14267-1L-EAManufacturer: Dawn ScientificSodium Tetraphenylboron TS - 1L (1 per EA )Learn Morewas $165.62 Special Price $161.48
- Sodium Thiosulfate TS - 1LSKU: TS14269-1L-EAManufacturer: Dawn ScientificSodium Thiosulfate TS - 1L (1 per EA )Learn Morewas $189.62 Special Price $184.87
- Manufacturer Dawn Scientific Remove This Item
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