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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Oxalic Acid, 0.1 N (0.05 M), 4.00 L Poly naturalSKU: CO100000-4A-EAManufacturer: Reagents IncOxalic Acid, 0.1 N (0.05 M), 4.00 L Poly natural (1 per EA )Learn Morewas $257.00 Special Price $192.24 -
Cupric Citrate TS 2, Alkaline - 500mLSKU: TS14086-500ml-EAManufacturer: Dawn ScientificCupric Citrate TS 2, Alkaline - 500mL (1 per EA )Learn Morewas $149.62 Special Price $145.88 -
Sodium Hydroxide, 40 Percent (w/v) Solution, 500mL, CAS# 1310-73-2SKU: S-427-500MLPL-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 40 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 $108.65 Special Price $88.41 - Aluminum Sulfate, 0.05 M, 4.00 L Poly naturalSKU: CA011800-4A-EAManufacturer: Reagents IncAluminum Sulfate, 0.05 M, 4.00 L Poly natural (1 per EA )Learn Morewas $91.00 Special Price $68.04
- 1,10-Phenanthroline, 0.3% w/v, 20.00 L CubitainerSKU: CP121800-20F-EAManufacturer: Reagents Inc1,10-Phenanthroline, 0.3% w/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $563.00 Special Price $422.28
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Sodium Hydroxide, 0.5 N Aqueous Solution, 500mL, CAS# 1310-73-2SKU: S-360-500ML-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 0.5 N Aqueous Solution - Spectrum solutions utilize the highest quality raw materials appropriate to your product. Most raw materials meet or exceed the specifications established by the American Chemical Society. Where appropriate, many finished products are traceable to NIST Standard Reference Materials. Manufacturing, quality control testing, and packaging are all performed in Spectrum’s own facilities. Record keeping and sample retention of all produced lots ensure product consistency and complete traceability. (1 per EA )Learn Morewas $63.55 Special Price $51.71 - Hydrochloric Acid, 10% w/w, 1.00 L Poly naturalSKU: CH101000-1A-EAManufacturer: Reagents IncHydrochloric Acid, 10% w/w, 1.00 L Poly natural (1 per EA )Learn Morewas $45.50 Special Price $34.56
- Ammonium Hydroxide, 10% v/v, 1.00 L Poly naturalSKU: CA011500-1A-EAManufacturer: Reagents IncAmmonium Hydroxide, 10% v/v, 1.00 L Poly natural (1 per EA )Learn Morewas $77.00 Special Price $57.24
- Phenolphthalein, 0.7% /MeOH, 4.00 L Poly naturalSKU: CP260600-4A-EAManufacturer: Reagents IncPhenolphthalein, 0.7% /MeOH, 4.00 L Poly natural (1 per EA )Learn Morewas $160.00 Special Price $119.88
- Potassium Iodide, 50% w/v, 1.00 L Glass amberSKU: CP003800-1C-EAManufacturer: Reagents IncPotassium Iodide, 50% w/v, 1.00 L Glass amber (1 per EA )Learn Morewas $216.00 Special Price $162.00
- Acid Stannous Chloride TS - 100mLSKU: TS14008-100ml-EAManufacturer: Dawn ScientificAcid Stannous Chloride TS - 100mL (1 per EA )Learn Morewas $44.62 Special Price $43.50
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Total Alkalinity Indicator, galSKU: R-0645-G-EAManufacturer: Taylor TechnologiesTotal Alkalinity Indicator, gal (1 per EA)Learn Morewas $128.93 Special Price $98.49 -
Long Range Indicator, .75 oz, Dropper BottleSKU: R-1003U-A-DB-EAManufacturer: Taylor TechnologiesLong Range Indicator, .75 oz, Dropper Bottle (1 per EA)Learn Morewas $10.99 Special Price $8.39 -
Acriflavine Hydrochloride, 100g, CAS# 8063-24-9SKU: AC175-100GM-EAManufacturer: Spectrum ChemicalAcriflavine Hydrochloride, a topical antiseptic, is a dye and can be used to treat fungal infections. 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$322.20 -
Ammonium Carbonate TS, (U.S.P. Test Solution), 100mL, CAS# 506-87-6SKU: A-302-100ML-EAManufacturer: Spectrum ChemicalAmmonium Carbonate 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 $332.45 Special Price $319.69 -
Ammonia-Cyanide TS, (U.S.P. Test Solution), 100mL, CAS# 7784-24-9SKU: A-274-100ML-EAManufacturer: Spectrum ChemicalAmmonia-Cyanide 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 $383.90 Special Price $369.17 -
NTA Cosolvent Solution, 2 ozSKU: R-0879-C-EAManufacturer: Taylor TechnologiesNTA Cosolvent Solution, 2 oz (1 per EA)Learn Morewas $13.69 Special Price $10.46 - Potassium Chromate, 1% w/v, 1.00 L Poly naturalSKU: CP091600-1A-EAManufacturer: Reagents IncPotassium Chromate, 1% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $59.50 Special Price $44.28
- Sodium Hydroxide, 20% w/v, 500.00 mL Poly naturalSKU: CS101000-500A-EAManufacturer: Reagents IncSodium Hydroxide, 20% w/v, 500.00 mL Poly natural (1 per EA )Learn Morewas $43.50 Special Price $32.40
- Acid Ferric Chloride TS - 100mLSKU: TS14006-100ml-EAManufacturer: Dawn ScientificAcid Ferric Chloride TS - 100mL (1 per EA )Learn Morewas $39.62 Special Price $38.63
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Sodium Hydroxide, SVS Concentrate, To Prepare 0.2 N Solution, 1UNIT, CAS# 1310-73-2SKU: SV240-1UNIT-CSManufacturer: Spectrum ChemicalSodium Hydroxide, SVS Concentrate, To Prepare 0.2 N Solution (6 per CS )Learn More$371.40 - ACF Buffer, 4.00 L Poly naturalSKU: CA106000-4A-EAManufacturer: Reagents IncACF Buffer, 4.00 L Poly natural (1 per EA )Learn Morewas $1,090.00 Special Price $817.56
- Potassium Iodate, 0.125 N, 1.00 L Glass amberSKU: CP105500-1C-EAManufacturer: Reagents IncPotassium Iodate, 0.125 N, 1.00 L Glass amber (1 per EA )Learn Morewas $67.00 Special Price $50.76
- Sodium Hydroxide, 0.1667 N, 20.00 L CubitainerSKU: CS101900-20F-EAManufacturer: Reagents IncSodium Hydroxide, 0.1667 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $199.00 Special Price $149.04
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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
4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
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