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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Sodium Bicarbonate, Saturated, 500ML, Poly BottleSKU: LC229471-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $40.00 Special Price $30.00 -
Starch Iodide Paste TS - 500mLSKU: TS14275-500ml-EAManufacturer: Dawn ScientificStarch Iodide Paste TS - 500mL (1 per EA )Learn Morewas $139.62 Special Price $136.13 -
DPD Reagent #2, .75 oz, Dropper BottleSKU: R-0002-A-EAManufacturer: Taylor TechnologiesDPD Reagent #2, .75 oz, Dropper Bottle (1 per EA)Learn Morewas $6.76 Special Price $5.17 -
Acetic Acid, 1% v/v Solution, 120 mLSKU: A1003-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAcetic Acid, 1% v/v Solution, 120 mL (1 per EA)Learn More$14.40 - Lead Acetate 10% W/V, 500ML, Poly BottleSKU: LC161001-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $93.50 Special Price $70.12
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PBS 1X Solution, Phosphate Buffered Saline 1X Sterile Solution, 500 mLSKU: P10400-500.0-EAManufacturer: Research Products InternationalDimensions: 7.00 x 3.50 x 3.50 Weight: 0.25 - Research or further manufacturing use only, not for food or drug use. (1 per EA )Learn More$30.65 - Sodium Cyanide, 10% w/v Solution, 1 LSKU: S1026-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsADD DOT POISON PACK !! (1 per EA)Learn More$107.95
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Buffer Solution pH 7.0, 16 ozSKU: R-1099-07-E-EAManufacturer: Taylor TechnologiesBuffer Solution pH 7.0, 16 oz (1 per EA)Learn Morewas $16.56 Special Price $12.65 -
Grams Iodine Solution25gSKU: G-446-500ML-EAManufacturer: Spectrum ChemicalGrams Iodine Solution acts as a mordant for Gram staining technique. It forms an insoluble crystal violet-iodine complex, which imparts purple color to the cells. (1 per EA )Learn Morewas $54.65 Special Price $44.47 -
Ferroin Indicator, 2 oz, Dropper BottleSKU: R-0819-C-EAManufacturer: Taylor TechnologiesFerroin Indicator, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $30.34 Special Price $23.18 -
Sulfuric Acid N/10, galSKU: R-0627S-10-G-EAManufacturer: Taylor TechnologiesSulfuric Acid N/10, gal (1 per EA )Learn Morewas $49.14 Special Price $43.96 -
Toluidine Blue O Indicator, 16 ozSKU: R-0881-E-EAManufacturer: Taylor TechnologiesToluidine Blue O Indicator, 16 oz (1 per EA)Learn Morewas $87.06 Special Price $66.50 -
Calcium Buffer, 16 oz (glass)SKU: R-0653-2-E-EAManufacturer: Taylor TechnologiesCalcium Buffer, 16 oz (glass) (1 per EA)Learn Morewas $52.63 Special Price $40.21 -
DPD Reagent #3, .75 oz, Dropper Bottle, 24-packSKU: R-0003-A-24-PKManufacturer: Taylor TechnologiesDPD Reagent #3, .75 oz, Dropper Bottle, 24-pack (24 per PK)Learn Morewas $156.58 Special Price $119.61 -
Hydroquinone, 500G, Amber GlassSKU: LC154901-EAManufacturer: LabChemShelf Life (months): , , UN Number: UN3077 (1 per EA)Learn Morewas $135.10 Special Price $101.33 - Diphenylamine TS - 100mLSKU: TS14101-100ml-EAManufacturer: Dawn ScientificDiphenylamine TS - 100mL (1 per EA )Learn Morewas $69.62 Special Price $67.88
- Hydrochloric Acid, 50% v/v Solution, 500 mLSKU: H1016-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsHydrochloric Acid, 50% v/v Solution, 500 mL (1 per EA)Learn More$26.95
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Sulfuric Acid 10% W/W, 200L, Poly DrumSKU: LC25590200-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $1,569.60 Special Price $1,207.52 - Ferric Nitrate, 50% w/v Solution, 100 mL, Glass w/ DropperSKU: F1007-100mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsFerric Nitrate, 50% w/v Solution, 100 mL, Glass w/ Dropper (1 per EA)Learn More$27.30
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Diluting Fluid For Sperm, 125ML, Poly BottleSKU: LC135877-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $43.00 Special Price $32.25 -
Sulfuric Acid N, 2 oz w/ orange cap, Dropper BottleSKU: R-0686O-C-EAManufacturer: Taylor TechnologiesSulfuric Acid N, 2 oz w/ orange cap, Dropper Bottle (1 per EA)Learn Morewas $10.99 Special Price $8.39 -
Carnoy's Solution (Fixative), 500mL, CAS# 1322-14-1SKU: C-475-500ML-EAManufacturer: Spectrum ChemicalCarnoy's Solution (Fixative), a fixative composed of ethanol, chloroform and glacial acetic acid, can be used to enhance lymph node detection while dissecting cadavers and as a fixative for pap smear samples. 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 $281.10 Special Price $228.72 -
Iodide Iodate N/126, 32 ozSKU: R-0633-126-F-EAManufacturer: Taylor TechnologiesIodide Iodate N/126, 32 oz (1 per EA)Learn Morewas $32.11 Special Price $24.53 -
Hardness Buffer, 2 oz w/ blue cap, Dropper BottleSKU: R-0619B-C-EAManufacturer: Taylor TechnologiesHardness Buffer, 2 oz w/ blue cap, Dropper Bottle (1 per EA)Learn Morewas $13.35 Special Price $10.19
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