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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Buffer Solution, pH 13.0, Reference Standard Solution, pH 10.0 +/- 0.1, For Water Hardness, APHA, 4SKU: B-378-4LTPL-EAManufacturer: Spectrum ChemicalBuffer Solution, pH 13.0, Reference Standard (1 per EA )Learn Morewas $200.60 Special Price $163.23 -
EDTA Titrant, 0.02 M, 500.00 mL Poly naturalSKU: CE105000-500A-EAManufacturer: Reagents IncEDTA Titrant, 0.02 M, 500.00 mL Poly natural (1 per EA )Learn Morewas $36.00 Special Price $27.00 -
Borate Buffer, 4L, Poly BottleSKU: LC117004-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $145.90 Special Price $109.43 - Acetic Acid, 0.2N (0.2M), 4L, Poly BottleSKU: LC103604-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $101.40 Special Price $76.05
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Potassium Biiodate, 0.1N (0.0085M), 1L, Poly BottleSKU: LC187402-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $108.90 Special Price $81.68 - Fehlings Solution inBin, 4L, Poly BottleSKU: LC142104-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1824 (1 per EA)Learn Morewas $165.90 Special Price $124.43
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Silica Reagent #1, 2 ozSKU: R-1306T-C-EAManufacturer: Taylor TechnologiesSilica Reagent #1, 2 oz (1 per EA)Learn Morewas $10.39 Special Price $7.93 -
Potassium Pyroantimonate TS, Solution, 1L, CAS# 12208-13-8SKU: P-198-1LT-EAManufacturer: Spectrum ChemicalPotassium Pyroantimonate TS, 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 $178.40 Special Price $171.56 -
Sodium Hydroxide, 10% w/v Solution, 100 mLSKU: S1009-100mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsCaustic Soda (1 per EA)Learn More$17.85 -
tert-Butyl Hydroperoxide, 70 Percent Solution in Water, 100mL, CAS# 75-91-2SKU: B2499-100ML-EAManufacturer: Spectrum Chemicaltert-Butyl Hydroperoxide, 70 Percent Solution in Water, with a systematic name of tert-Butyl hydroperoxide, is used in a variety of oxidation processes. 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$135.20 -
Sodium Thiosulfate, 0.1N (0.1M), 10L, Cubitainer®SKU: LC250606-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $146.70 Special Price $110.03 - Ferric Chloride 40% W/V, 4L, Poly BottleSKU: LC143704-EAManufacturer: LabChemShelf Life (months): 36, Traceable to NIST, UN Number: UN3264 (1 per EA)Learn Morewas $572.30 Special Price $429.22
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Potassium Hydroxide, 1.0N (1.0M), 500ML, Poly BottleSKU: LC193501-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1814 (1 per EA)Learn Morewas $43.90 Special Price $32.93 - Sulfuric Acid, 93% (66° Baume), 2.50 L Glass scSKU: C5102700-2.5D-EAManufacturer: Reagents IncSulfuric Acid, 93% (66° Baume), 2.50 L Glass sc (1 per EA )Learn Morewas $71.00 Special Price $52.92
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Mercuric Nitrate, 0.0171N (0.0086M), 4L, Amber GlassSKU: LC166554-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $202.20 Special Price $151.65 - Hydrochloric Acid, 3.0N (3.0M), 4L, Poly BottleSKU: LC153304-EAManufacturer: LabChemShelf Life (months): 36, Traceable to NIST, UN Number: UN1789 (1 per EA)Learn Morewas $146.20 Special Price $109.65
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Molybdate Reagent, 2 oz, Dropper BottleSKU: R-0601-C-DB-EAManufacturer: Taylor TechnologiesMolybdate Reagent, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $12.95 Special Price $9.89 -
Glutaric Dialdehyde, 50 Percent in Water, 100mL, CAS# 658-79-7SKU: G3060-100ML-EAManufacturer: Spectrum ChemicalGlutaric Dialdehyde, 50 Percent in Water is also referred to as Glutaraldehyde. It is a colorless and oily liquid with a pungent smell. Most commonly used to disinfect medical equipment, it is also used as a preservative and in industrial water treatment and is also a component of fracking fluid. (1 per EA )Learn Morewas $152.70 Special Price $135.55 - Edta Titrant, 0.01M (0.02N), 1L, Poly BottleSKU: LC138502-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $37.60 Special Price $28.20
- Sodium Chloride 0.85% W/V, 1L, Poly BottleSKU: LC234502-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $39.80 Special Price $29.85
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Thiosulfate N/10, 16 ozSKU: R-0697-E-EAManufacturer: Taylor TechnologiesThiosulfate N/10, 16 oz (1 per EA)Learn Morewas $15.44 Special Price $11.79 - Phosphoric Acid, 0.085% w/w Solution, 4 L, Amber GlassSKU: P1152-4L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPhosphoric Acid, 0.085% w/w Solution, 4 L, Amber Glass (1 per EA )Learn More$66.90
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Potassium Permanganate TS - 500mLSKU: TS14225-500ml-EAManufacturer: Dawn ScientificPotassium Permanganate TS - 500mL (1 per EA )Learn Morewas $109.62 Special Price $106.88 - Potassium Hydroxide, 0.01N (0.01M), 4L, Poly BottleSKU: LC192754-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $156.00 Special Price $117.00
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