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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Vario Silica Hr Acid Reagent, F25 1000 PackSKU: 531933-PKManufacturer: Lovibond Tintometer GroupLovibond VARIO Silica HR Acid Reagent, F25, 1000 Pack 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 Lovibond Powder Pack programmed provides more exp (1000 per PK)Learn More$649.70 -
Vario Sulfate 4 Reagent, F10 100 Pack, Ea/1SKU: 532160-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2106769. (1 per EA )Learn More$41.08 -
Monochloroacetic Acid Buffer, 1.00 L Glass amberSKU: CM003300-1C-EAManufacturer: Reagents IncMonochloroacetic Acid Buffer, 1.00 L Glass amber (1 per EA )Learn Morewas $557.00 Special Price $417.96 - Sulfuric Acid, 93% (66° Baume), 20.00 L Winpak blueSKU: C5102700-20E7-EAManufacturer: Reagents IncSulfuric Acid, 93% (66° Baume), 20.00 L Winpak blue (1 per EA )Learn Morewas $275.00 Special Price $206.28
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Tube Test Cadmium 25 Tests, Ea/1SKU: 420750-EAManufacturer: Lovibond Tintometer GroupLovibond® Cadmium Tube Test, 100 ct (1 per EA)Learn More$266.70 - TKN Digestion Reagent, 10.00 L CubitainerSKU: CT1007R0-10F-EAManufacturer: Reagents IncTKN Digestion Reagent, 10.00 L Cubitainer (1 per EA )Learn Morewas $575.00 Special Price $442.36
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Vario Fe In Mo Reagent Set 100 Tests, Ea/1SKU: 536010-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2544800. Lovibond VARIO Fe in Mo Reagent Set, 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 Lovibond Powde (1 per EA)Learn More$204.40 - Zinc Sulfate, 0.1 M, 1.00 L Poly naturalSKU: CZ130200-1A-EAManufacturer: Reagents IncZinc Sulfate, 0.1 M, 1.00 L Poly natural (1 per EA )Learn Morewas $115.00 Special Price $88.47
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Phenylhydrazine Acetate TS - 500mLSKU: TS14202-500ml-EAManufacturer: Dawn ScientificPhenylhydrazine Acetate TS - 500mL (1 per EA )Learn Morewas $129.62 Special Price $126.38 - Hydrogen Peroxide, 17.5% w/w, 200.00 L DrumSKU: CH300000-200EV-EAManufacturer: Reagents IncHydrogen Peroxide, 17.5% w/w, 200.00 L Drum (1 per EA )Learn Morewas $1,590.00 Special Price $1,192.32
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Laemmli Buffer Reducing, 4X Solution, 25 MillilitersSKU: L18200-25.0-EAManufacturer: Research Products InternationalDimensions: 2.00 x 4.00 x 2.00 Weight: 0.24 - Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$53.65 - Potassium Acetate, 2.75%/GAA, 250.00 mL Glass amberSKU: CP006700-250C-EAManufacturer: Reagents IncPotassium Acetate, 2.75%/GAA, 250.00 mL Glass amber (1 per EA )Learn Morewas $74.00 Special Price $55.08
- Sodium Hydroxide, 0.1 N, 100.00 mL Poly naturalSKU: C7318000-100A-EAManufacturer: Reagents IncSodium Hydroxide, 0.1 N, 100.00 mL Poly natural (1 per EA )Learn Morewas $17.00 Special Price $12.96
- Pot Iodate-Iodide, 0.0125 N, 1.00 L Glass amberSKU: C7286010-1C-EAManufacturer: Reagents IncPot Iodate-Iodide, 0.0125 N, 1.00 L Glass amber (1 per EA )Learn Morewas $38.50 Special Price $29.16
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Slide, Ozone DPD, 0-0.66 or 0-2.0 ppmSKU: 5570-EAManufacturer: Taylor TechnologiesSlide, Ozone DPD, 0-0.66 or 0-2.0 ppm (1 per EA )Learn Morewas $1.04 Special Price $0.93 - Diiodofluorescein TS - 500mLSKU: TS14097-500ml-EAManufacturer: Dawn ScientificDiiodofluorescein TS - 500mL (1 per EA )Learn Morewas $159.62 Special Price $155.63
- Ammonium Chloride, 0.1 M, 1.00 L Poly naturalSKU: CA014700-1A-EAManufacturer: Reagents IncAmmonium Chloride, 0.1 M, 1.00 L Poly natural (1 per EA )Learn Morewas $66.50 Special Price $51.16
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