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 Potassium Persulfate 50 Pack, Ea/1SKU: 531560-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2084766. (1 per EA )Learn More$23.82 -
Hydrochloric Acid, 15% v/v, 4.00 L Poly naturalSKU: CH121100-4A-EAManufacturer: Reagents IncHydrochloric Acid, 15% v/v, 4.00 L Poly natural (1 per EA )Learn Morewas $246.00 Special Price $184.68 - Acetate Buffer pH 6.0 EP, 1.00 L Poly naturalSKU: CA015500-1A-EAManufacturer: Reagents IncAcetate Buffer pH 6.0 EP, 1.00 L Poly natural (1 per EA )Learn Morewas $67.50 Special Price $50.76
- Potassium Permanganate, 5% w/v, 500.00 mL Glass amberSKU: C7288570-500C-EAManufacturer: Reagents IncPotassium Permanganate, 5% w/v, 500.00 mL Glass amber (1 per EA )Learn Morewas $46.00 Special Price $34.56
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Iodine (Iodate-Iodide), SVS Concentrate, To Prepare 0.1 N SolutionSKU: SV090-1UNIT-EAManufacturer: Spectrum ChemicalIodine (Iodate-Iodide), SVS Concentrate, To Prepare 0.1 N Solution (1 per EA )Learn More$127.60 - Buffer, pH 6.00, 20.00 L CubitainerSKU: C2155550-20F-EAManufacturer: Reagents IncBuffer, pH 6.00, 20.00 L Cubitainer (1 per EA )Learn Morewas $187.00 Special Price $140.40
- Starch Indicator for Sulfite, 1.00 L Poly naturalSKU: CS001000-1A-EAManufacturer: Reagents IncStarch Indicator for Sulfite, 1.00 L Poly natural (1 per EA )Learn Morewas $67.00 Special Price $50.76
- HPLC Eluent, 10.00 L CubitainerSKU: CH100400-10F-EAManufacturer: Reagents IncHPLC Eluent, 10.00 L Cubitainer (1 per EA )Learn Morewas $216.00 Special Price $162.00
- Potassium Dichromate, 0.200 N, 1L, CAS# 7778-50-9SKU: P-344-1LT-EAManufacturer: Spectrum ChemicalPotassium Dichromate, 0.200 N (1 per EA )Learn Morewas $82.90 Special Price $67.45
- Fast Green Dye Indicator, 500.00 mL Poly naturalSKU: CF128000-500A-EAManufacturer: Reagents IncFast Green Dye Indicator, 500.00 mL Poly natural (1 per EA )Learn Morewas $439.00 Special Price $329.40
- Nitric Acid, 60% v/v, 1.00 L Glass amberSKU: CN207400-1C-EAManufacturer: Reagents IncNitric Acid, 60% v/v, 1.00 L Glass amber (1 per EA )Learn Morewas $117.00 Special Price $87.48
- Hydroxylamine HCl, 10% w/v, 1.00 L Poly naturalSKU: CH145000-1A-EAManufacturer: Reagents IncHydroxylamine HCl, 10% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $166.00 Special Price $124.20
- Triton X-100™ Wetting Agent, 500.00 mL Poly naturalSKU: C2342800-500A-EAManufacturer: Reagents IncTriton X-100™ Wetting Agent, 500.00 mL Poly natural (1 per EA )Learn Morewas $190.00 Special Price $142.56
- Potassium Hydroxide, 45% w/w, 1.00 L Poly naturalSKU: C7285000-1A-EAManufacturer: Reagents IncPotassium Hydroxide, 45% w/w, 1.00 L Poly natural (1 per EA )Learn Morewas $72.00 Special Price $54.00
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Phenylhydrazine-Sulfuric Acid TS - 100mLSKU: TS14203-100ml-EAManufacturer: Dawn ScientificPhenylhydrazine-Sulfuric Acid TS - 100mL (1 per EA )Learn Morewas $39.62 Special Price $38.63 - Nitric Acid, SVS Concentrate, To Prepare 0.1 N Solution, 1UNIT, CAS# 7697-37-2SKU: SV120-1UNIT-CSManufacturer: Spectrum ChemicalNitric Acid, SVS Concentrate, To Prepare 0.1 N Solution - Spectrum's Standard Volumetric Solution (SVS) concentrate when diluted to 1 liter will yield a 0.1 N solution. Simply dilute the desired Standard Volumetric Solution concentrate to the specified volume (carefully following instructions provided with the package) and the resulting solution will have an exact Normality within 0.1%. Spectrum Standard Volumetric Solution concentrates are relied upon for fast, accurate results in life sciences and pharmaceutical quality control applications. (6 per CS )Learn More$607.75
- Buffer Solution Concentrate, pH 10.00SKU: B1167-500ML-EAManufacturer: Spectrum ChemicalBuffer Solution Concentrate, pH 10.00 - Spectrum's Buffer Solution Concentrates when diluted as directed will yield a pH 10.00 SOLUTION. Spectrum Buffer Solution Concentrates are relied upon for cost effective, fast, accurate results in life sciences and pharmaceutical quality control applications. (1 per EA )Learn Morewas $221.95 Special Price $180.60
- Mercuric-Potassium Iodide TS (Mayer's Reagent) - 500mLSKU: TS14161-500ml-EAManufacturer: Dawn ScientificMercuric-Potassium Iodide TS (Mayer's Reagent) - 500mL (1 per EA )Learn Morewas $65.62 Special Price $63.98
- Hydrogen Peroxide, 3 Percent Solution, Reagent, 4L, CAS# 7722-84-1SKU: H1060-4LT-CSManufacturer: Spectrum ChemicalHydrogen Peroxide, 3 Percent Solution, Reagent, is the simplest peroxide, a strong oxidizer that appears as a clear and slightly viscous liquid. Its oxidizing properties are so strong that it is considered a highly reactive oxygen species. Due to it being a weak acid it can form hydroperoxide or peroxide salts. One of its biggest uses is in the treatment of drinking water, removing odors, organic materials and the amount of Hydrogen sulfides and Iron. Its reagent grade means it is used as the standard against which other compounds are graded in analytical testing labs. (4 per CS )Learn Morewas $783.35 Special Price $753.31
- Sodium Silicate, 41° Baume, 4.00 L Poly naturalSKU: C2324900-4A-EAManufacturer: Reagents IncSodium Silicate, 41° Baume, 4.00 L Poly natural (1 per EA )Learn Morewas $78.00 Special Price $58.32
- Ammoniacal Buffer, pH 10, 1.00 L Poly naturalSKU: CA014500-1A-EAManufacturer: Reagents IncAmmoniacal Buffer, pH 10, 1.00 L Poly natural (1 per EA )Learn Morewas $125.00 Special Price $93.96
- Buffer, pH 7.00, Yellow, 1.00 L Poly naturalSKU: C2156000-1A-EAManufacturer: Reagents IncBuffer, pH 7.00, Yellow, 1.00 L Poly natural (1 per EA )Learn Morewas $43.00 Special Price $32.40
- Borate Buffer, pH 9.5, 4.00 L Poly naturalSKU: CB009500-4A-EAManufacturer: Reagents IncBorate Buffer, pH 9.5, 4.00 L Poly natural (1 per EA )Learn Morewas $194.00 Special Price $145.80
- Formic Acid, 25% v/v, 500.00 mL Poly naturalSKU: CF148100-500A-EAManufacturer: Reagents IncFormic Acid, 25% v/v, 500.00 mL Poly natural (1 per EA )Learn Morewas $51.00 Special Price $37.80
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BEAD BATH 20 L, 120 V, TYPE B PLUG, Liters/EA: 20
was $1,794.65 Special Price $1,714.78
LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
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