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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SSC Buffer 20X Powder, 263.56 Grams of Powder, Makes 1 Liter of 20X Solution CAS# 7647-14-5, 6132-04-3SKU: S24020-1.0-EAManufacturer: Research Products InternationalDimensions: 3.50 x 3.75 x 3.50, Weight: 0.68, Cas#: 7647-14-5, 6132-04-3 Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$38.35 -
Hydrochloric Acid 25% V/V (1+3), 1L, Poly BottleSKU: LC151002-EAManufacturer: LabChemShelf Life (months): 36, Traceable to NIST, UN Number: UN1789 (1 per EA)Learn Morewas $79.80 Special Price $59.85 -
Nitric Acid, 2.0N (2.0M), 2.5L, Clear GlassSKU: LC178503-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2031 (1 per EA)Learn Morewas $144.50 Special Price $108.38 -
Cupriethylenediamine, 1.0M, 1L, Amber GlassSKU: LC135432-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: UN1761 (1 per EA)Learn Morewas $154.20 Special Price $115.65 -
Potassium Fluoride, 50 Percent (w/v) Solution, 4L, CAS# 7789-23-3SKU: P-459-4LTPL-EAManufacturer: Spectrum ChemicalPotassium Fluoride, 50 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 $515.10 Special Price $419.13 -
Potassium Fluoride, 50% w/v, 20.00 L CubitainerSKU: CP005100-20F-EAManufacturer: Reagents IncPotassium Fluoride, 50% w/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $2,130.00 Special Price $1,597.32 -
Sodium DL-Lactate Solution, 60 Percent (w/w), USP, CAS# 72-17-3SKU: SO179-500MLGL-EAManufacturer: Spectrum ChemicalSodium DL-Lactate Solution, 60 Percent (w/w), USP is used for the restoration of extracellular fluid and electrolytes balances. All Spectrum Chemical USP products 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 $297.10 Special Price $222.47 -
Acetate Buffer pH 4.5, For Cyanide, 500ML, Poly BottleSKU: LC100401-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $56.60 Special Price $42.45 -
pH 7.00 Calibration Buffer Solution 8 ozSKU: AI1101-EAManufacturer: Apera InstrumentspH 7.00 Calibration Buffer Solution 8 oz, 0.01 pH Accuracy at 25°C (77°F) High Accuracy (±0.01 pH): standardized against NIST certified pH references within 0.01 pH at 25°C (77°F). Ideal for the calibration of all kinds of pH meters/testers Color-coded, D (1 per EA )Learn Morewas $11.00 Special Price $9.50 -
Sulfanilamide 1% W/V, 500ML, Amber PolySKU: LC254501-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1789 (1 per EA)Learn Morewas $77.70 Special Price $59.78 - Sodium Carbonate, 0.0455N (0.02275M), 500ML, Poly BottleSKU: LC230201-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $42.70 Special Price $32.02
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Iodide Iodate N/80, galSKU: R-0633-80-G-EAManufacturer: Taylor TechnologiesIodide Iodate N/80, gal (1 per EA)Learn Morewas $78.81 Special Price $60.21 -
Glyoxal, 40 Percent in Water500gSKU: G1022-100GM-EAManufacturer: Spectrum ChemicalGlyoxal, 40 Percent in Water is used as a crosslinker for starch-based products in the coated paper and textile industry, as well as, being used as a solubilizer and crosslinker in polymer chemistry. (1 per EA )Learn More$86.30 - Sodium Cyanide, 10% w/v, 4.00 L Poly naturalSKU: CS150000-4A-EAManufacturer: Reagents IncSodium Cyanide, 10% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $975.00 Special Price $731.16
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Stannous Chloride, Acid, Stronger, TS - 500mLSKU: TS14272-500ml-EAManufacturer: Dawn ScientificStannous Chloride, Acid, Stronger, TS - 500mL (1 per EA )Learn Morewas $164.62 Special Price $160.51 -
Silver Nitrate, 0.74% w/v Solution, 3.8 L, Amber PolySKU: S1097-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSilver Nitrate, 0.74% w/v Solution, 3.8 L, Amber Poly (1 per EA)Learn More$169.95 - Free Lime Reagent, 20.00 L Winpak blueSKU: CF158000-20E7-EAManufacturer: Reagents IncFree Lime Reagent, 20.00 L Winpak blue (1 per EA )Learn Morewas $1,740.00 Special Price $1,304.64
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Potassium Fluoride 50% W/V, 20L, Cubitainer®SKU: LC191105-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $1,795.50 Special Price $1,346.63 -
Cresol Red Indicator, .75 ozSKU: R-1003K-A-EAManufacturer: Taylor TechnologiesCresol Red Indicator, .75 oz (1 per EA)Learn Morewas $15.92 Special Price $12.17 - pH 7.00 Calibration Buffer, Yellow, 20 LSKU: P1002-20L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsNIST Traceable; pH = 7.00 ? 0.01 @ 25 ?C (1 per EA)Learn More$79.00
- Potassium Thiocyanate 10% W/V, 500ML, Poly BottleSKU: LC221401-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $73.50 Special Price $55.12
- Ammonium Chloride, 0.1M (0.1N), 500ML, Poly BottleSKU: LC109751-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $56.50 Special Price $42.38
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Sulfuric Acid, 0.2 N Solution, 1L, CAS# 7664-93-9SKU: S-620-1LT-EAManufacturer: Spectrum ChemicalSulfuric Acid, 0.2 N Solution - Spectrum utilizes 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 $73.80 Special Price $60.05 -
Copper Sulfate 10% W/V, 4L, Poly BottleSKU: LC134404-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $122.00 Special Price $91.50
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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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