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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Silver Nitrate, 0.02 N, 1.00 L Glass amberSKU: C7303010-1C-EAManufacturer: Reagents IncSilver Nitrate, 0.02 N, 1.00 L Glass amber (1 per EA )Learn Morewas $87.00 Special Price $64.80 -
Potassium Dichromate, 0.025N (0.0042M), 500ML, Poly BottleSKU: LC189501-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $39.00 Special Price $29.25 -
Sulfuric Acid 20% V/V, 4L, Poly BottleSKU: LC256074-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $132.50 Special Price $101.93 -
Pyridine-Barbituric Acid, 500ML, Amber GlassSKU: LC221901-EAManufacturer: LabChemShelf Life (months): 2, , UN Number: (1 per EA)Learn Morewas $88.60 Special Price $66.45 -
Magnesium Chloride 51% W/V, 1L, Poly BottleSKU: LC163902-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $161.60 Special Price $121.20 - Hydrochloric Acid 20% V/V (1+4), 4L, Poly BottleSKU: LC150904-EAManufacturer: LabChemShelf Life (months): 36, Traceable to NIST, UN Number: UN1789 (1 per EA)Learn Morewas $98.70 Special Price $74.02
- Hydrochloric Acid 1% V/V (1+99), 4L, Poly BottleSKU: LC150004-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $88.60 Special Price $66.45
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Barium Chloride 20% W/V, 1L, Poly BottleSKU: LC116052-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $83.10 Special Price $62.33 -
Glucose-Glutamic Acid, 1L, Amber GlassSKU: LC148452-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $95.70 Special Price $71.78 - Ferric Chloride, 0.03 M, 1.00 L Poly naturalSKU: CF002000-1A-EAManufacturer: Reagents IncFerric Chloride, 0.03 M, 1.00 L Poly natural (1 per EA )Learn Morewas $95.00 Special Price $71.28
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Ammonium Molybdate 4% W/V, 500ML, Poly BottleSKU: LC112101-EAManufacturer: LabChemShelf Life (months): 6, , UN Number: (1 per EA)Learn Morewas $82.30 Special Price $61.72 - Mercuric Nitrate, 0.141N (0.071M), 500ML, Amber GlassSKU: LC166601-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $93.90 Special Price $70.43
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Vario Hr Cod Reagent 0-15000 Mg/L; 25 Vials, Ea/1SKU: 2420722-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2415925. Lovibond COD HR Vario Vials 0-15000 mg/l, 16mm diameter (pack of 25) (1 per EA)Learn More$54.70 -
Iodide Iodate N/80, 32 ozSKU: R-0633-80-F-EAManufacturer: Taylor TechnologiesIodide Iodate N/80, 32 oz (1 per EA)Learn Morewas $32.16 Special Price $24.57 - Sulfuric Acid, 0.2N (0.1M), 4L, Poly BottleSKU: LC257004-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $86.10 Special Price $64.57
- Copper Sulfate for Chrome Test, 4.00 L Poly naturalSKU: CC003800-4A-EAManufacturer: Reagents IncCopper Sulfate for Chrome Test, 4.00 L Poly natural (1 per EA )Learn Morewas $84.00 Special Price $62.64
- Sodium Borate Buffer Solution, 1L, Poly BottleSKU: LC229622-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $75.10 Special Price $56.32
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Buffer Solution pH 10.0 Blue, 1L, Poly BottleSKU: LC125052-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $43.20 Special Price $32.40 - Glycerin, 500ML, Poly BottleSKU: LC148501-EAManufacturer: LabChemShelf Life (months): , , UN Number: (1 per EA)Learn Morewas $71.70 Special Price $53.77
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Conductivity Neutralizing Solution, galSKU: R-7022-G-EAManufacturer: Taylor TechnologiesConductivity Neutralizing Solution, gal (1 per EA )Learn Morewas $90.50 Special Price $80.96 -
Murexide Indicator Dry In NaCl, 100G, Poly BottleSKU: LC175109-EAManufacturer: LabChemShelf Life (months): 36, , UN Number: (1 per EA)Learn Morewas $79.90 Special Price $59.93 - Bromocresol Green 0.04% (Aq), 500ML, Poly BottleSKU: LC118301-EAManufacturer: LabChemShelf Life (months): 36, , UN Number: (1 per EA)Learn Morewas $39.80 Special Price $29.85
- Boric Acid 2% W/V With Indicator, 500ML, Poly BottleSKU: LC117701-EAManufacturer: LabChemShelf Life (months): 1, , UN Number: (1 per EA)Learn Morewas $82.50 Special Price $61.87
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Mercuric-Ammonium Thiocyanate TS - 100mLSKU: TS14156-100ml-EAManufacturer: Dawn ScientificMercuric-Ammonium Thiocyanate TS - 100mL (1 per EA )Learn Morewas $94.62 Special Price $92.25
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