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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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
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Potassium EDTA 0.090M, 1.00 L Poly naturalSKU: CP005500-1A-EAManufacturer: Reagents IncPotassium EDTA 0.090M, 1.00 L Poly natural (1 per EA )Learn Morewas $72.00 Special Price $54.00 -
Potassium Iodide, 5 Percent (w/v) Aqueous Solution, For Residual Chlorine, APHA, 4L, CAS# 7681-11-0SKU: P-520-4LTGL-EAManufacturer: Spectrum ChemicalPotassium Iodide, 5 Percent (w/v) Aqueous Solution, For Residual Chlorine, APHA - As an APHA certified solution, this item is meets the ASTM D1209 standards and can be used in water and waste water treatment facilities to determine the concentration of dissolved and particulate materials. Spectrum Chemical manufactured APHA grade products meet the toughest regulatory standards for quality and purity. (1 per EA )Learn Morewas $135.25 Special Price $110.05 - Ammonium Hydroxide, SVS Concentrate, To Prepare 0.1 N Solution, 1UNIT, CAS# 1336-21-6SKU: SV020-1UNIT-EAManufacturer: Spectrum ChemicalAmmonium Hydroxide, SVS Concentrate, To Prepare 0.1 N Solution, is a solution of ammonia in water. Aqueous ammonia, as it's otherwise known is used as a complexant and base in qualitative inorganic analysis. It becomes a deep blue color with copper solutions. Used to dissolve silver oxide residues, such as the ones formed from Tollens' reagent, it is also commonly used in numerous cleaning agents, such as window cleaning formulas as well as a complexant that is manufactured to parts-per-billion trace impurities and has been used in the semiconductor industry to dissolve heavy or precious metal components. (1 per EA )Learn More$218.85
- Potassium Pyroantimonate TS - 1LSKU: TS14226-1L-EAManufacturer: Dawn ScientificPotassium Pyroantimonate TS - 1L (1 per EA )Learn Morewas $169.62 Special Price $165.38
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Vario Potassium Iodide Reagent 100 Pack, Ea/1SKU: 532180-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 107799. (1 per EA )Learn More$29.54 - Vario Sulfamic Acid Reagent, F10 100 Pack, Ea/1SKU: 532190-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 105599. (1 per EA )Learn More$23.40
- Sodium Cyanide, 10% w/v, 1.00 L Poly naturalSKU: CS150000-1A-EAManufacturer: Reagents IncSodium Cyanide, 10% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $386.00 Special Price $289.44
- Silver Nitrate, 0.0282 N, 1.00 L Glass amberSKU: CS004800-1C-EAManufacturer: Reagents IncSilver Nitrate, 0.0282 N, 1.00 L Glass amber (1 per EA )Learn Morewas $120.00 Special Price $89.64
- Oxalic Acid, 10% w/v, 500.00 mL Poly naturalSKU: C7110150-500A-EAManufacturer: Reagents IncOxalic Acid, 10% w/v, 500.00 mL Poly natural (1 per EA )Learn Morewas $52.00 Special Price $38.88
- Copper Sulfate Sol Can Coating, 4.00 L Poly naturalSKU: CC102100-4A-EAManufacturer: Reagents IncCopper Sulfate Sol Can Coating, 4.00 L Poly natural (1 per EA )Learn Morewas $129.00 Special Price $97.20
- Potassium Dichromate, 0.5 N, 1.00 L Poly naturalSKU: CP202200-1A-EAManufacturer: Reagents IncPotassium Dichromate, 0.5 N, 1.00 L Poly natural (1 per EA )Learn Morewas $63.00 Special Price $47.52
- TISAB II, for Fluoride ISE, 500.00 mL Poly naturalSKU: C7340210-500A-EAManufacturer: Reagents IncTISAB II, for Fluoride ISE, 500.00 mL Poly natural (1 per EA )Learn Morewas $61.00 Special Price $45.36
- Sodium Silicate, 41° Baume, 20.00 L CubitainerSKU: C2324900-20F-EAManufacturer: Reagents IncSodium Silicate, 41° Baume, 20.00 L Cubitainer (1 per EA )Learn Morewas $332.00 Special Price $249.48
- Sodium Cyanide, 25% w/v, 1.00 L Poly naturalSKU: CS151000-1A-EAManufacturer: Reagents IncSodium Cyanide, 25% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $630.00 Special Price $473.04
- Sulfamic Acid Technical, 10.00 K EachSKU: C2114333-10KG-EAManufacturer: Reagents IncSulfamic Acid Technical, 10.00 K Each (1 per EA )Learn Morewas $457.00 Special Price $342.36
- Sodium Hydroxide, 0.111 N, 4.00 L Poly naturalSKU: CS101800-4A-EAManufacturer: Reagents IncSodium Hydroxide, 0.111 N, 4.00 L Poly natural (1 per EA )Learn Morewas $198.00 Special Price $149.04
- p-Naphtholbenzein Indicator, 1.00 L Glass amberSKU: CN002800-1C-EAManufacturer: Reagents Incp-Naphtholbenzein Indicator, 1.00 L Glass amber (1 per EA )Learn Morewas $54.00 Special Price $41.04
- Sulfuric Acid, 70% v/v, 500.00 mL Poly naturalSKU: CS202200-500A-EAManufacturer: Reagents IncSulfuric Acid, 70% v/v, 500.00 mL Poly natural (1 per EA )Learn Morewas $105.00 Special Price $78.84
- Phosphate Buffer, pH 7.2, BOD, 4.00 L Poly naturalSKU: C7271150-4A-EAManufacturer: Reagents IncPhosphate Buffer, pH 7.2, BOD, 4.00 L Poly natural (1 per EA )Learn Morewas $191.00 Special Price $143.64
- Sodium Hydroxide, 0.3333 N, 20.00 L Winpak blueSKU: CS131400-20E7-EAManufacturer: Reagents IncSodium Hydroxide, 0.3333 N, 20.00 L Winpak blue (1 per EA )Learn Morewas $199.00 Special Price $149.04
- Potassium Ferrocyanide 10% w/v, 500.00 mL Poly naturalSKU: CP170000-500A-EAManufacturer: Reagents IncPotassium Ferrocyanide 10% w/v, 500.00 mL Poly natural (1 per EA )Learn Morewas $108.00 Special Price $81.00
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