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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Boron Trifluoride 50 Percent in Methanol, 1L, CAS# 373-57-9SKU: B2634-1LT-EAManufacturer: Spectrum ChemicalBoron Trifluoride 50 Percent in Methanol, also known as Trifluoroborane, is an inorganic compound used as a reagent in organic chemistry and considered a versatile building block. 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 More$3,181.20 - Sodium Carboxymethylcellulose, (Viscosity of 2 Percent Aqueous Solution @ 25 DEG C: 34.0-50.0 cP), USP4-32-4SKU: C4622-500GM-EAManufacturer: Spectrum ChemicalSodium Carboxymethylcellulose, (Viscosity of 2 Percent Aqueous Solution @ 25 DEG C: 34.0-50.0 cP), USP4-32-4 (1 per EA )Learn Morewas $163.45 Special Price $120.91
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500mL Red Buffer Solution pH 4.0 @ 25°C, Poly BottleSKU: B2283-500ML-EAManufacturer: Midland Scientific500mL Red Buffer Solution pH 4.0 @ 25°C, Poly Bottle (1 per EA )Learn Morewas $9.80 Special Price $7.94 - 4L Blue Buffer Solution pH 10.0 @ 25°C, Poly BottleSKU: MSIB2281-4L-EAManufacturer: Midland Scientific4L Blue Buffer Solution pH 10.0 @ 25°C, Poly Bottle (1 per EA )Learn Morewas $29.79 Special Price $24.75
- 1L Yellow Buffer Solution pH 7.0 @ 25°C, Poly BottleSKU: MSIB2287-1L-EAManufacturer: Midland Scientific1L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle (1 per EA )Learn Morewas $21.78 Special Price $18.28
- 250mL Yellow Buffer Solution pH 7.0 @ 25°C, Poly BottleSKU: MSIB2287-250ML-EAManufacturer: Midland Scientific250mL Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle (1 per EA )Learn Morewas $9.32 Special Price $7.59
- 4L Yellow Buffer Solution pH 7.0 @ 25°C, CubitainerSKU: MSIB2287-4CT-EAManufacturer: Midland Scientific4L Yellow Buffer Solution pH 7.0 @ 25°C, Cubitainer (1 per EA )Learn Morewas $76.88 Special Price $70.58
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Acetonitrile (with 0.1% TFA) HPLC - 4X4LSKU: LC9893-4x4L-CSManufacturer: Dawn ScientificAcetonitrile (with 0.1% TFA) HPLC - 4X4L (4 per CS )Learn Morewas $629.62 Special Price $613.88 - Acetonitrile : Water 50:50 Ratio HPLC - 4X4LSKU: LC9896-4x4L-CSManufacturer: Dawn ScientificAcetonitrile : Water 50:50 Ratio HPLC - 4X4L (4 per CS )Learn Morewas $499.62 Special Price $487.13
- Alkaline Cupric Citrate TS 2 - 1LSKU: TS14017-1L-EAManufacturer: Dawn ScientificAlkaline Cupric Citrate TS 2 - 1L (1 per EA )Learn Morewas $469.62 Special Price $457.88
- Alkaline Cupric Iodide TS - 1LSKU: TS14018-1L-EAManufacturer: Dawn ScientificAlkaline Cupric Iodide TS - 1L (1 per EA )Learn Morewas $359.62 Special Price $350.63
- Alkaline Picrate TS - 1LSKU: TS14021-1L-EAManufacturer: Dawn ScientificAlkaline Picrate TS - 1L (1 per EA )Learn Morewas $249.62 Special Price $243.38
- Ammonium Carbonate TS 2 - 1LSKU: TS14035-1L-EAManufacturer: Dawn ScientificAmmonium Carbonate TS 2 - 1L (1 per EA )Learn Morewas $214.62 Special Price $209.25
- Antimony Trichloride TS - 1LSKU: TS14048-1L-EAManufacturer: Dawn ScientificAntimony Trichloride TS - 1L (1 per EA )Learn Morewas $255.62 Special Price $249.23
- Bromophenol Blue TS - 1LSKU: TS14064-1L-EAManufacturer: Dawn ScientificBromophenol Blue TS - 1L (1 per EA )Learn Morewas $234.62 Special Price $228.75
- Bromothymol Blue TS - 1LSKU: TS14065-1L-EAManufacturer: Dawn ScientificBromothymol Blue TS - 1L (1 per EA )Learn Morewas $269.62 Special Price $262.88
- Calcium sulfate TS - 1LSKU: TS14069-1L-EAManufacturer: Dawn ScientificCalcium sulfate TS - 1L (1 per EA )Learn Morewas $349.62 Special Price $340.88
- Chromotropic Acid TS - 1LSKU: TS14073-1L-EAManufacturer: Dawn ScientificChromotropic Acid TS - 1L (1 per EA )Learn Morewas $369.62 Special Price $360.37
- Crystal Violet TS - 1LSKU: TS14080-1L-EAManufacturer: Dawn ScientificCrystal Violet TS - 1L (1 per EA )Learn Morewas $219.62 Special Price $214.13
- Cupric Acetate TS - 1LSKU: TS14081-1L-EAManufacturer: Dawn ScientificCupric Acetate TS - 1L (1 per EA )Learn Morewas $264.62 Special Price $258.00
- Cupric Iodide TS, Alkaline - 1LSKU: TS14087-1L-EAManufacturer: Dawn ScientificCupric Iodide TS, Alkaline - 1L (1 per EA )Learn Morewas $294.62 Special Price $287.26
- Diphenylamine TS - 1LSKU: TS14101-1L-EAManufacturer: Dawn ScientificDiphenylamine TS - 1L (1 per EA )Learn Morewas $274.62 Special Price $267.75
- Dragendorff's TS - 1LSKU: TS14104-1L-EAManufacturer: Dawn ScientificDragendorff's TS - 1L (1 per EA )Learn Morewas $239.62 Special Price $233.63
- 8-Hydroxyquinoline TS - 1LSKU: TS14127-1L-EAManufacturer: Dawn Scientific8-Hydroxyquinoline TS - 1L (1 per EA )Learn Morewas $254.62 Special Price $248.26
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