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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Cupric Sulfate TS, (U.S.P. Test Solution), 1L, CAS# 7758-98-7SKU: C-313-1LT-EAManufacturer: Spectrum ChemicalCupric Sulfate TS, (U.S.P. Test Solution) is a ready-for-use solution for the purpose of conducting USP, National Formulary and assay tests and is prepared according to the specifications of the USP Pharmacopeial Convention. (1 per EA )Learn Morewas $446.75 Special Price $429.61 -
EDTA, 0.05 Molar, 1 L, PolySKU: E1006-1L-EAManufacturer: 710 Spirits Rocky Mtn Reagents0.1 N; Ethylenediaminetetraacetic Acid, Disodium Salt, Dihydrate (1 per EA)Learn More$22.85 -
Acetic Acid Glacial, Purified, 2.50 L Glass clearSKU: C5100500-2.5D1-EAManufacturer: Reagents IncAcetic Acid Glacial, Purified, 2.50 L Glass clear (1 per EA )Learn Morewas $108.00 Special Price $81.00 - Copper Sulfate,22.5%/11.3% HCl, 4.00 L Poly naturalSKU: CC102000-4A-EAManufacturer: Reagents IncCopper Sulfate,22.5%/11.3% HCl, 4.00 L Poly natural (1 per EA )Learn Morewas $355.00 Special Price $266.76
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Lead Fluoborate, 50 Percent Solution, 2.5L, CAS# 13814-96-5SKU: L1065-2.5LT-EAManufacturer: Spectrum ChemicalLead Fluoborate, 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$973.54 - Potassium Chloride, 1 M Unstd, 4.00 L Poly naturalSKU: CP203300-4A-EAManufacturer: Reagents IncPotassium Chloride, 1 M Unstd, 4.00 L Poly natural (1 per EA )Learn Morewas $77.00 Special Price $57.24
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Methylene Blue, 1 Percent (w/v) Aqueous Solution, CAS# 61-73-4SKU: M-204-500MLPL-EAManufacturer: Spectrum ChemicalMethylene Blue, 1 Percent (w/v) Aqueous Solution (1 per EA )Learn Morewas $55.60 Special Price $45.79 -
Acetic Acid, 0.1N (0.1M), 4L, Poly BottleSKU: LC103504-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $93.70 Special Price $70.28 -
Boric Acid 4% W/V With Indicator (Bcg), 10L, Cubitainer®SKU: LC117506-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $172.40 Special Price $129.30 -
Sodium Carbonate 10% W/V, 500ML, Poly BottleSKU: LC229801-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $45.30 Special Price $33.98 -
Iodide Iodate N/40, 32 ozSKU: R-0633-40-F-EAManufacturer: Taylor TechnologiesIodide Iodate N/40, 32 oz (1 per EA)Learn Morewas $34.31 Special Price $26.21 -
Lead Acetate TS, (U.S.P. Test Solution), CAS# 546-67-8SKU: L-102-500ML-EAManufacturer: Spectrum ChemicalLead Acetate TS, (U.S.P. Test Solution) is a ready-for-use solution for the purpose of conducting USP, National Formulary and assay tests and is prepared according to the specifications of the USP Pharmacopeial Convention. (1 per EA )Learn More$358.10 -
Ammonia Solution, FCC, 500mL, CAS# 1336-21-6SKU: A1293-500MLGL-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 Morewas $198.55 Special Price $161.56 - Ferric Ammonium Sulfate, Sat, 4.00 L Poly naturalSKU: CF126400-4A-EAManufacturer: Reagents IncFerric Ammonium Sulfate, Sat, 4.00 L Poly natural (1 per EA )Learn Morewas $479.00 Special Price $359.64
- Sodium Acetate 20% W/W, 500ML, Poly BottleSKU: LC228301-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $82.20 Special Price $61.65
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EDTA, 0.0575 Molar, 3.8 L, Poly GallonSKU: E1007-3.8L-EAManufacturer: 710 Spirits Rocky Mtn Reagents0.115 N; Ethylenediaminetetraacetic Acid, Disodium Salt, Dihydrate (1 per EA)Learn More$46.45 -
Silver Nitrate, 0.01N (0.01M) In Ipa, 4L, Amber PolySKU: LC227454-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: UN1993 (1 per EA)Learn Morewas $395.50 Special Price $296.62 -
Free Polymer Reagent #2, 2 ozSKU: R-0831-C-EAManufacturer: Taylor TechnologiesFree Polymer Reagent #2, 2 oz (1 per EA)Learn Morewas $45.12 Special Price $34.47 -
Potassium Hydroxide, 10 Percent (w/v), Solution, 4L, CAS# 1310-58-3SKU: P-906-4LTPL-EAManufacturer: Spectrum ChemicalPotassium Hydroxide, 10 Percent (w/v), 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 Morewas $352.55 Special Price $286.87 -
Potassium Iodate-Iodide, 0.1N (0.0167M), 500ML, Amber PolySKU: LC196801-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $77.80 Special Price $58.35 -
Neocuproine Reagent, 125ML, Poly BottleSKU: LC176307-EAManufacturer: LabChemShelf Life (months): 1, , UN Number: UN1993 (1 per EA)Learn Morewas $72.60 Special Price $54.45 -
Formaldehyde 10% V/V Unbuffered, 1L, Poly BottleSKU: LC146602-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $59.60 Special Price $44.70 - Morin Solution, 125ML, Poly BottleSKU: LC174207-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: UN1993 (1 per EA)Learn Morewas $235.80 Special Price $176.85
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Sodium Hydroxide, 10% w/w Solution, 1 L, PolySKU: S1213-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSodium Hydroxide, 10% w/w Solution, 1 L, Poly (1 per EA )Learn More$26.15
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4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
BEAD BATH 20 L, 120 V, TYPE B PLUG, Liters/EA: 20
was $1,794.65 Special Price $1,714.78
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