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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Ferric Subsulfate Solution, USP, 500mL, CAS# 1310-45-8SKU: F1305-500ML-CSManufacturer: Spectrum ChemicalFerric Subsulfate Solution, USP. All Spectrum Chemical USP grade products are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP). (6 per CS )Learn Morewas $1,789.40 Special Price $1,323.67 -
Perchloric Acid, 0.1 N/Dioxane, 4.00 L Glass amberSKU: CP120200-4C-EAManufacturer: Reagents IncPerchloric Acid, 0.1 N/Dioxane, 4.00 L Glass amber (1 per EA )Learn Morewas $768.00 Special Price $575.64 - Ammonium Oxalate TS (0.5 N), 500.00 mL Poly naturalSKU: CA103200-500A-EAManufacturer: Reagents IncAmmonium Oxalate TS (0.5 N), 500.00 mL Poly natural (1 per EA )Learn Morewas $26.00 Special Price $19.44
- Brine Solution, Filtered, 4.00 L Poly naturalSKU: CB004400-4A-EAManufacturer: Reagents IncBrine Solution, Filtered, 4.00 L Poly natural (1 per EA )Learn Morewas $230.00 Special Price $172.80
- Reagent 2 Lucite Formulation, 1.00 L Amber polySKU: CR056100-1B-EAManufacturer: Reagents IncReagent 2 Lucite Formulation, 1.00 L Amber poly (1 per EA )Learn Morewas $83.00 Special Price $62.64
- Sodium Dodecyl Sulfate, 10%w/v, 1.00 L Poly naturalSKU: CS123000-1A-EAManufacturer: Reagents IncSodium Dodecyl Sulfate, 10%w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $746.00 Special Price $559.44
- Sodium Thiosulfate, 0.02 N, 1.00 L Glass amberSKU: CS002700-1C-EAManufacturer: Reagents IncSodium Thiosulfate, 0.02 N, 1.00 L Glass amber (1 per EA )Learn Morewas $40.00 Special Price $30.24
- Potassium Permanganate, 0.001M, 1.00 L Glass amberSKU: CP280500-1C-EAManufacturer: Reagents IncPotassium Permanganate, 0.001M, 1.00 L Glass amber (1 per EA )Learn Morewas $44.00 Special Price $33.48
- Formaldehyde, 10% v/v, pH 7.0, 1.00 L Poly naturalSKU: C2208510-1A-EAManufacturer: Reagents IncFormaldehyde, 10% v/v, pH 7.0, 1.00 L Poly natural (1 per EA )Learn Morewas $44.50 Special Price $33.48
- Boric Acid Test Solution, 100.00 mL Poly naturalSKU: CB112200-100A-EAManufacturer: Reagents IncBoric Acid Test Solution, 100.00 mL Poly natural (1 per EA )Learn Morewas $42.00 Special Price $31.32
- Ferric Chloride, 2% Alcoholic, 500.00 mL Glass amberSKU: CF134200-500C-EAManufacturer: Reagents IncFerric Chloride, 2% Alcoholic, 500.00 mL Glass amber (1 per EA )Learn Morewas $108.00 Special Price $81.00
- Buffer, pH 4.00, Red, 1.00 L Poly naturalSKU: C2155500-1A-EAManufacturer: Reagents IncBuffer, pH 4.00, Red, 1.00 L Poly natural (1 per EA )Learn Morewas $43.00 Special Price $32.40
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Af 326, Hazen Set-Up 0-500 Pt. Co. Units , Ea/1SKU: 433260-EAManufacturer: Lovibond Tintometer GroupLovibond AF326 Hazen/Pt-Co (Platinum-Cobalt)/ALPHA, 0 - 500 mg/l units The scale can be referred to by different names depending on the industry: “Color of Water”, Hazen, Platinum Cobalt, APHA or ASTM D 1209. (1 per EA)Learn More$7,949.40 -
Magnesium Edta 0.02% W/V, 1L, Poly BottleSKU: LC164502-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $84.70 Special Price $63.53 -
Boric Acid 4% W/V, 500ML, Poly BottleSKU: LC117401-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $43.80 Special Price $32.85 -
Periodic Acid, 50 Percent, Solution, 500mL, CAS# 10450-60-9SKU: P1708-500ML-EAManufacturer: Spectrum ChemicalPeriodic Acid, 50 Percent, Solution - Ungraded products supplied by Spectrum are indicative of a grade suitable for general industrial use or research purposes and typically are not suitable for human consumption or therapeutic use. (1 per EA )Learn More$463.50 -
Phosphomolybdic Acid TS - 100mLSKU: TS14206-100ml-EAManufacturer: Dawn ScientificPhosphomolybdic Acid TS - 100mL (1 per EA )Learn Morewas $229.62 Special Price $223.88 -
Dpd Solution, 500ML, Amber GlassSKU: LC137001-EAManufacturer: LabChemShelf Life (months): 4, , UN Number: (1 per EA)Learn Morewas $99.20 Special Price $74.40 -
Iodide Iodate Reagent (25 mL sample, 1 drop = 2 ppm Na₂SO₃), galSKU: R-0808-G-EAManufacturer: Taylor TechnologiesIodide Iodate Reagent (25 mL sample, 1 drop = 2 ppm Na₂SO₃), gal (1 per EA )Learn Morewas $74.65 Special Price $66.78 -
Bromocresol Green, 0.1 Percent (w/v) Aqueous Indicator Solution, 500mL, CAS# 76-60-8SKU: B-163-500MLPL-EAManufacturer: Spectrum ChemicalBromocresol Green, 0.1 Percent (w/v) Aqueous Indicator Solution is used as a pH indicator and as a tracking dye for DNA agarose gel electrophoresis. Ungraded products supplied by Spectrum are indicative of a grade suitable for general industrial use or research purposes and typically are not suitable for human consumption or therapeutic use. (1 per EA )Learn Morewas $192.65 Special Price $171.01 - Iodine, 0.05 N, 500.00 mL Glass amberSKU: CI200600-500C-EAManufacturer: Reagents IncIodine, 0.05 N, 500.00 mL Glass amber (1 per EA )Learn Morewas $88.00 Special Price $65.88
- Barium Chloride, 30% w/w, 10.00 L CubitainerSKU: CB111800-10F-EAManufacturer: Reagents IncBarium Chloride, 30% w/w, 10.00 L Cubitainer (1 per EA )Learn Morewas $300.00 Special Price $224.64
- Buffer Solution, pHospHate-Cyanide, 500ML, Poly BottleSKU: LC185501-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $82.50 Special Price $61.87
- Hydrochloric Acid 5% V/V (1+19), 1L, Poly BottleSKU: LC150502-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1789 (1 per EA)Learn Morewas $47.90 Special Price $35.92
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