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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Thymol Blue 0.08% In Methanol, 500ML, Poly BottleSKU: LC260501-EAManufacturer: LabChemShelf Life (months): 6, , UN Number: UN1993 (1 per EA)Learn Morewas $58.50 Special Price $45.01 -
3,5-Dinitrosalicylic Acid Soln, 1.00 L Glass amberSKU: C7196830-1C-EAManufacturer: Reagents Inc3,5-Dinitrosalicylic Acid Soln, 1.00 L Glass amber (1 per EA )Learn Morewas $138.00 Special Price $103.68 -
Ferric Chloride TS - 100mLSKU: TS14111-100ml-EAManufacturer: Dawn ScientificFerric Chloride TS - 100mL (1 per EA )Learn Morewas $39.62 Special Price $38.63 -
Edta 50% W/V, 1L, Poly BottleSKU: LC139502-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $190.50 Special Price $142.87 -
Iodine, 0.01N (0.005M), 500ML, Amber GlassSKU: LC156001-EAManufacturer: LabChemShelf Life (months): 18, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $52.10 Special Price $39.07 -
Glucono delta-Lactone, FCC, 100g, CAS# 90-80-2SKU: GL107-100GM-EAManufacturer: Spectrum ChemicalGlucono delta-Lactone, FCC is used as a sequestrant, a leavening agent, and an acidifier. The FCC grade meets the requirements of the Food Chemical Codex indicates and is suitable for all food, beverage and nutritional supplement applications. Spectrum Chemical offers over 300 Food grade 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$91.85 - Potassium Hydroxide, 0.5N (0.5M) In Isopropanol, 1L, Poly BottleSKU: LC195302-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: UN2924 (1 per EA)Learn Morewas $95.70 Special Price $71.78
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Ferroin Indicator, 125ML, Amber GlassSKU: LC144507-EAManufacturer: LabChemShelf Life (months): 36, , UN Number: (1 per EA)Learn Morewas $62.90 Special Price $47.17 -
Acid Digestion-Nitrogen, 4L, Poly BottleSKU: LC105504-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN2796 (1 per EA)Learn Morewas $343.50 Special Price $257.62 - Hydroxylamine HCl, 0.5 N Blue, 1.00 L Poly naturalSKU: CH144100-1A-EAManufacturer: Reagents IncHydroxylamine HCl, 0.5 N Blue, 1.00 L Poly natural (1 per EA )Learn Morewas $194.00 Special Price $145.80
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Hydrogen Peroxide, 15% w/w Solution, 5 gal, CAS# 7722-84-1SKU: H1022-5gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsHydrogen Peroxide, 15% w/w Solution, 5 gal, CAS# 7722-84-1 (1 per EA)Learn More$255.15 -
Bromothymol Blue, Sodium Salt, ACS, 10G, Amber GlassSKU: LC120407-EAManufacturer: LabChemShelf Life (months): , , UN Number: (1 per EA)Learn Morewas $134.50 Special Price $100.87 - Lead Acetate 10% W/V, 1L, Poly BottleSKU: LC161002-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $119.70 Special Price $89.78
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L-Alanine, FCC, 100g, CAS# 56-41-7SKU: A1252-100GM-EAManufacturer: Spectrum ChemicalL-Alanine, FCC is included in the 20 amino acids encoded by the genetic code and often used in cases of hypoglycemia. The FCC grade meets the requirements of the Food Chemical Codex indicates and is suitable for all food, beverage and nutritional supplement applications. Spectrum Chemical offers over 300 Food grade 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 Morewas $237.30 Special Price $175.53 - Sodium Hypochlorite, 5%, 1.00 L Poly naturalSKU: C2319000-1A-EAManufacturer: Reagents IncSodium Hypochlorite, 5%, 1.00 L Poly natural (1 per EA )Learn Morewas $24.50 Special Price $18.36
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Mercuric Nitrate, 0.1N (0.05M), 4L, Amber GlassSKU: LC166584-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $255.10 Special Price $191.32 - Buffer Solution, pHospHate-Cyanide, 1L, Poly BottleSKU: LC185502-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $118.50 Special Price $88.87
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Barium Chloride Solution 10%, 16 ozSKU: R-0646-E-EAManufacturer: Taylor TechnologiesBarium Chloride Solution 10%, 16 oz (1 per EA)Learn Morewas $20.17 Special Price $15.40 - Sodium Arsenite, 0.05 N, 1.00 L Glass amberSKU: CS126000-1C-EAManufacturer: Reagents IncSodium Arsenite, 0.05 N, 1.00 L Glass amber (1 per EA )Learn Morewas $105.00 Special Price $78.84
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Acetic Acid, 50% v/v Solution, 1 LSKU: A1009-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAcetic Acid, 50% v/v Solution, 1 L (1 per EA)Learn More$38.35 -
Potassium Chromate, 20% w/v Solution, 100 mL, Glass w/ DropperSKU: P1003-100mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Chromate, 20% w/v Solution, 100 mL, Glass w/ Dropper (1 per EA)Learn More$28.05 - Sodium pHenate Solution, 1L, Poly BottleSKU: LC247702-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1760 (1 per EA)Learn Morewas $112.50 Special Price $86.54
- NaCl-Hydroxylamine Sulfate 12%, 1.00 L Poly naturalSKU: CS112300-1A-EAManufacturer: Reagents IncNaCl-Hydroxylamine Sulfate 12%, 1.00 L Poly natural (1 per EA )Learn Morewas $219.00 Special Price $164.16
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TRIS BUFFERED SALINE, 10X SOLUTION, 4 LITER CAS# 77-86-1; 7647-14-5; 7447-40-7SKU: T60075-4000.0-EAManufacturer: Research Products InternationalMol. Wt: Common Name: TRIS Buffered Saline 10X Solution Formula: Dimensions: 7.00 x 10.50 x 4.25, Weight: 10, Cas#: 77-86-1; 7647-14-5; 7447-40-7 Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$132.80
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4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
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
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