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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Iodide Iodate N/40, 16 ozSKU: R-0633-40-E-EAManufacturer: Taylor TechnologiesIodide Iodate N/40, 16 oz (1 per EA)Learn Morewas $21.02 Special Price $16.06 -
Thymolphthalein Indicator, 0.05% w/v in Denatured Ethanol, 120 mLSKU: T1007-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 8.8 (colorless) - pH 10.5 (blue) (1 per EA)Learn More$19.95 -
Murexide Indicator 0.15%, 125ML, Amber GlassSKU: LC175007-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $72.70 Special Price $54.53 -
Glycine 10% W/V, 500ML, Poly BottleSKU: LC148801-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $61.10 Special Price $45.82 -
Buffer Solution pH 7.0, galSKU: R-1099-07-G-EAManufacturer: Taylor TechnologiesBuffer Solution pH 7.0, gal (1 per EA)Learn Morewas $56.36 Special Price $43.06 -
Titanium Trichloride-Sulfuric Acid TS - 500mLSKU: TS14297-500ml-EAManufacturer: Dawn ScientificTitanium Trichloride-Sulfuric Acid TS - 500mL (1 per EA )Learn Morewas $439.62 Special Price $428.63 -
Mercuric Nitrate, 0.01 N Aqueous Solution, CAS# 10045-94-0SKU: M-174-500ML-EAManufacturer: Spectrum ChemicalMercuric Nitrate, 0.01 N Aqueous Solution, also known as mercury(II) nitrate solution, acts as an oxidizer in analytical chemistry applications. 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 $103.65 Special Price $85.37 - Silver Nitrate, 15% w/v Solution, 100 mL, Amber GlassSKU: S1224-100mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSilver Nitrate, 15% w/v Solution, 100 mL, Amber Glass (1 per EA )Learn More$157.85
- Sodium Thiosulfate, 1.0N (1.0M), 500ML, Poly BottleSKU: LC251001-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $38.30 Special Price $29.46
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Copper Reagent #1, 2 ozSKU: R-0860-C-EAManufacturer: Taylor TechnologiesCopper Reagent #1, 2 oz (1 per EA)Learn Morewas $18.11 Special Price $13.83 -
Ethylene Glycol, 40% v/v, 200.00 L DrumSKU: CE246000-200E-EAManufacturer: Reagents IncEthylene Glycol, 40% v/v, 200.00 L Drum (1 per EA )Learn Morewas $2,180.00 Special Price $1,635.12 - Barker's Reagent, 500.00 mL Poly naturalSKU: CB000300-500A-EAManufacturer: Reagents IncBarker's Reagent, 500.00 mL Poly natural (1 per EA )Learn Morewas $98.00 Special Price $73.44
- Starch Iodide Paste TS - 100mLSKU: TS14275-100ml-EAManufacturer: Dawn ScientificStarch Iodide Paste TS - 100mL (1 per EA )Learn Morewas $49.62 Special Price $48.38
- Manganous Sulfate Solution, 500ML, Poly BottleSKU: LC165701-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $72.60 Special Price $54.45
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Nitric Acid 20% V/V, 500ML, Amber GlassSKU: LC177501-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2031 (1 per EA)Learn Morewas $71.90 Special Price $53.92 -
Total Alkalinity Indicator, 2 oz, Dropper BottleSKU: R-0645-C-EAManufacturer: Taylor TechnologiesTotal Alkalinity Indicator, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $9.55 Special Price $7.29 -
Sulfuric Acid N/50, 16 ozSKU: R-0627S-50-E-EAManufacturer: Taylor TechnologiesSulfuric Acid N/50, 16 oz (1 per EA)Learn Morewas $16.17 Special Price $12.35 -
Lead Fluoborate, 50 Percent Solution, 25mL, CAS# 13814-96-5SKU: L1065-25ML-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$114.09 - Citric Acid, 20% w/v, 1.00 L Poly naturalSKU: CC204200-1A-EAManufacturer: Reagents IncCitric Acid, 20% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $28.00 Special Price $20.52
- Silver Diethyldithiocarbamate TS - 500mLSKU: TS14240-500ml-EAManufacturer: Dawn ScientificSilver Diethyldithiocarbamate TS - 500mL (1 per EA )Learn Morewas $219.62 Special Price $214.13
- Alkaline Cupric Tartrate TS - 500mLSKU: TS14019-500ml-EAManufacturer: Dawn ScientificAlkaline Cupric Tartrate TS - 500mL (1 per EA )Learn Morewas $129.62 Special Price $126.38
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Isopropyl Alcohol, 70% - 500ml w/Trigger SpraySKU: 151009TS-500-EAManufacturer: CorechemIsopropyl Alcohol, 70% - 500ml w/Trigger SprayLearn Morewas $28.00 Special Price $19.17 - Potassium Fluoride, 20% w/v Solution, 500 mL, PolySKU: P1064-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Monofluoride, Dihydrate (1 per EA)Learn More$46.65
- Iodine, 0.04728 N ASTM D1510, 4.00 L Glass amberSKU: CI101700-4C-EAManufacturer: Reagents IncIodine, 0.04728 N ASTM D1510, 4.00 L Glass amber (1 per EA )Learn Morewas $184.00 Special Price $138.24
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