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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Triethanolamine, 20% w/v, 500.00 mL Glass amberSKU: CT001800-500C-EAManufacturer: Reagents IncTriethanolamine, 20% w/v, 500.00 mL Glass amber (1 per EA )Learn Morewas $160.00 Special Price $123.09 - Zincon Color Reagent, 1.00 L Amber polySKU: CZ001000-1B-EAManufacturer: Reagents IncZincon Color Reagent, 1.00 L Amber poly (1 per EA )Learn Morewas $139.00 Special Price $106.94
- Titanium Indicator, 500.00 mL Amber polySKU: CT136000-500B-EAManufacturer: Reagents IncTitanium Indicator, 500.00 mL Amber poly (1 per EA )Learn Morewas $74.00 Special Price $56.92
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Ammonia Solution, FCC, 200L, CAS# 1336-21-6SKU: A1293-200LTBL-EAManufacturer: Spectrum ChemicalAmmonia Solution, FCC is a solution of Ammonia in water. It has many uses, but in food production it is used primarily as a leavening agent. Spectrum Chemical offers over 300 Food Grade (FCC) chemical ingredients packaged in laboratory size bottles to production drum quantities and are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP) per 21CFR part 211 in FDA registered and inspected facilities. (1 per EA )Learn More$2,559.90 - Phosphoric Acid, 55% v/v, 10.00 L CubitainerSKU: CP003400-10F-EAManufacturer: Reagents IncPhosphoric Acid, 55% v/v, 10.00 L Cubitainer (1 per EA )Learn Morewas $446.00 Special Price $334.80
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Vario Molybdate Hr Reagent Set, F25 100 Tests, Ea/1SKU: 535400-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2243400. Lovibond VARIO Molybdate HR Reagent Set, F25, 100 Tests The fast and easy use of VARIO Powder Packs has made them extremely popular for water testing applications in many countries throughout the world. The Lovib (1 per EA)Learn More$193.20 - Water Hardness Buffer Odorless, 1.00 L Poly naturalSKU: CW000800-1A-EAManufacturer: Reagents IncWater Hardness Buffer Odorless, 1.00 L Poly natural (1 per EA )Learn Morewas $80.00 Special Price $61.54
- Ferric Chloride, 0.025% w/v, 20.00 L CubitainerSKU: C7204000-20F-EAManufacturer: Reagents IncFerric Chloride, 0.025% w/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $280.00 Special Price $215.41
- Villella's Reagent, 1.9% /EtOH, 500.00 mL Glass amberSKU: CV000200-500C-EAManufacturer: Reagents IncVillella's Reagent, 1.9% /EtOH, 500.00 mL Glass amber (1 per EA )Learn Morewas $144.00 Special Price $110.78
- Water Hardness Titrating Soln, 4.00 L Poly naturalSKU: CW000900-4A-EAManufacturer: Reagents IncWater Hardness Titrating Soln, 4.00 L Poly natural (1 per EA )Learn Morewas $58.50 Special Price $45.01
- Water Hardness Titrating Soln, 10.00 L CubitainerSKU: CW000900-10F-EAManufacturer: Reagents IncWater Hardness Titrating Soln, 10.00 L Cubitainer (1 per EA )Learn Morewas $125.00 Special Price $96.17
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TE Buffer 20X Solution pH 8.0, 500 MillilitersSKU: T32200-500.0-EAManufacturer: Research Products InternationalDimensions: 2.75 x 6.75 x 2.75 Weight: 0.27 - Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$83.45 - Tetrabutylamm Hydroxide, 0.1 N, 500.00 mL Glass amberSKU: CT006000-500C-EAManufacturer: Reagents IncTetrabutylamm Hydroxide, 0.1 N, 500.00 mL Glass amber (1 per EA )Learn Morewas $359.00 Special Price $276.18
- Zero Oxygen Solution, 500.00 mL Poly naturalSKU: CZ129700-500A-EAManufacturer: Reagents IncZero Oxygen Solution, 500.00 mL Poly natural (1 per EA )Learn Morewas $97.00 Special Price $74.63
- Tartaric Acid Reagent 2, 20.00 L CubitainerSKU: CT101300-20F-EAManufacturer: Reagents IncTartaric Acid Reagent 2, 20.00 L Cubitainer (1 per EA )Learn Morewas $3,760.00 Special Price $2,892.62
- Titanium Indicator, 1.00 L Amber polySKU: CT136000-1B-EAManufacturer: Reagents IncTitanium Indicator, 1.00 L Amber poly (1 per EA )Learn Morewas $113.00 Special Price $86.94
- Triethanolamine, 20% v/v, 20.00 L CubitainerSKU: CT001600-20F-EAManufacturer: Reagents IncTriethanolamine, 20% v/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $609.00 Special Price $468.51
- Zinc Sulfate, 10% w/v, 1.00 L Poly naturalSKU: CZ132000-1A-EAManufacturer: Reagents IncZinc Sulfate, 10% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $103.00 Special Price $79.24
- Zinc Sulfate, 1 M, 500.00 mL Poly naturalSKU: CZ000700-500A-EAManufacturer: Reagents IncZinc Sulfate, 1 M, 500.00 mL Poly natural (1 per EA )Learn Morewas $87.00 Special Price $66.93
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Sodium Methoxide, 25 Percent (w/w) Solution in Methanol, 200L, CAS# 124-41-4SKU: S1531-200LTBL-EAManufacturer: Spectrum ChemicalSodium Methoxide, 25 Percent (w/w) Solution in Methanol is a chemical solution that is commonly used as a reagent in industry and laboratory uses. It is also used as an initiator of anionic addition polymerization with ethylene oxide as well as being used as a routine base in organic chemistry. (1 per EA )Learn More$2,659.30 - Potassium Fluoride, 50% pH 8.3, 4.00 L Poly naturalSKU: CP201800-4A-EAManufacturer: Reagents IncPotassium Fluoride, 50% pH 8.3, 4.00 L Poly natural (1 per EA )Learn Morewas $368.00 Special Price $276.48
- Sodium Acetate, 1 M (1 N), 10.00 L CubitainerSKU: CS150500-10F-EAManufacturer: Reagents IncSodium Acetate, 1 M (1 N), 10.00 L Cubitainer (1 per EA )Learn Morewas $171.00 Special Price $131.55
- Zinc Sulfate, 0.05 M, 4.00 L Poly naturalSKU: CZ000600-4A-EAManufacturer: Reagents IncZinc Sulfate, 0.05 M, 4.00 L Poly natural (1 per EA )Learn Morewas $244.00 Special Price $187.71
- Congo Red Indicator, 0.1% Aq, 1.00 L Glass amberSKU: CC019000-1C-EAManufacturer: Reagents IncCongo Red Indicator, 0.1% Aq, 1.00 L Glass amber (1 per EA )Learn Morewas $73.50 Special Price $56.54
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