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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Isopropanol, 25% w/w, 1.00 L Poly naturalSKU: CI000900-1A-EAManufacturer: Reagents IncIsopropanol, 25% w/w, 1.00 L Poly natural (1 per EA )Learn Morewas $32.00 Special Price $23.76 -
Vario Manganese Citrate Buffer Pp, F10 100 Pack, Ea/1SKU: 530650-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2107669. (1 per EA )Learn More$51.79 - Silver Nitrate, 0.001 N, 500.00 mL Glass amberSKU: CS015000-500C-EAManufacturer: Reagents IncSilver Nitrate, 0.001 N, 500.00 mL Glass amber (1 per EA )Learn Morewas $59.00 Special Price $44.28
- Hydrochloric Acid, 5% w/v, 1.00 L Poly naturalSKU: CH112500-1A-EAManufacturer: Reagents IncHydrochloric Acid, 5% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $54.50 Special Price $41.04
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Silver Nitrate N/58.4, 16 ozSKU: R-0629-58-E-EAManufacturer: Taylor TechnologiesSilver Nitrate N/58.4, 16 oz (1 per EA)Learn Morewas $47.30 Special Price $36.14 - TISAB I, for Fluoride ISE, 1.00 L Poly naturalSKU: C7340200-1A-EAManufacturer: Reagents IncTISAB I, for Fluoride ISE, 1.00 L Poly natural (1 per EA )Learn Morewas $50.00 Special Price $37.80
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Potassium Chromate TS - 100mLSKU: TS14215-100ml-EAManufacturer: Dawn ScientificPotassium Chromate TS - 100mL (1 per EA )Learn Morewas $34.62 Special Price $33.75 - Acetone, Buffer, TS - 100mLSKU: TS14005-100ml-EAManufacturer: Dawn ScientificAcetone, Buffer, TS - 100mL (1 per EA )Learn Morewas $34.62 Special Price $33.75
- Sulfuric Acid-Formaldehyde TS - 100mLSKU: TS14286-100ml-EAManufacturer: Dawn ScientificSulfuric Acid-Formaldehyde TS - 100mL (1 per EA )Learn Morewas $45.62 Special Price $44.47
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Potassium Fluoride, 40 Percent (w/v) Aqueous Solution, 4L, CAS# 7789-23-3SKU: P-335-4LT-EAManufacturer: Spectrum ChemicalPotassium Fluoride, 40 Percent (w/v) Aqueous Solution - 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 $478.65 Special Price $389.48 - Copper Sulfate, 20%/10% HCl, 4.00 L Poly naturalSKU: CC100500-4A-EAManufacturer: Reagents IncCopper Sulfate, 20%/10% HCl, 4.00 L Poly natural (1 per EA )Learn Morewas $197.00 Special Price $147.96
- Mixed Reagent Solution for Al, 1.00 L Poly naturalSKU: CM010000-1A-EAManufacturer: Reagents IncMixed Reagent Solution for Al, 1.00 L Poly natural (1 per EA )Learn Morewas $281.00 Special Price $210.60
- Ammonium Molybdate Reagent, 4.00 L Poly naturalSKU: CA219800-4A-EAManufacturer: Reagents IncAmmonium Molybdate Reagent, 4.00 L Poly natural (1 per EA )Learn Morewas $176.00 Special Price $131.76
- Sulfuric Acid, SVS Concentrate, To Prepare 0.5 N Solution, 1UNIT, CAS# 7664-93-9SKU: SV290-1UNIT-EAManufacturer: Spectrum ChemicalSulfuric Acid, SVS Concentrate, To Prepare 0.5 N Solution - Spectrum's Standard Volumetric Solution (SVS) concentrate when diluted to 1 liter will yield a 0.5 N solution. Simply dilute the desired Standard Volumetric Solution concentrate to the specified volume (carefully following instructions provided with the package) and the resulting solution will have an exact Normality within 0.1%. Spectrum Standard Volumetric Solution concentrates are relied upon for fast, accurate results in life sciences and pharmaceutical quality control applications. (1 per EA )Learn More$109.45
- Ammonium Hydroxide, 20% v/v, 500.00 mL Poly naturalSKU: CA015300-500A-EAManufacturer: Reagents IncAmmonium Hydroxide, 20% v/v, 500.00 mL Poly natural (1 per EA )Learn Morewas $60.00 Special Price $45.36
- Citric Acid Anhydrous Purified, 1.00 K EachSKU: C2104550-1KG-EAManufacturer: Reagents IncCitric Acid Anhydrous Purified, 1.00 K Each (1 per EA )Learn Morewas $71.50 Special Price $54.00
- Chloroplatinate Solution, 1.00 L Glass amberSKU: CC115700-1C-EAManufacturer: Reagents IncChloroplatinate Solution, 1.00 L Glass amber (1 per EA )Learn Morewas $3,430.00 Special Price $2,572.56
- Sudan III TS - 500mLSKU: TS14278-500ml-EAManufacturer: Dawn ScientificSudan III TS - 500mL (1 per EA )Learn Morewas $129.62 Special Price $126.38
- Thioacetamide TS - 500mLSKU: TS14291-500ml-EAManufacturer: Dawn ScientificThioacetamide TS - 500mL (1 per EA )Learn Morewas $72.62 Special Price $70.80
- IPA/Hexane, 46:54 w/w, 4.00 L Glass amberSKU: CI171400-4C-EAManufacturer: Reagents IncIPA/Hexane, 46:54 w/w, 4.00 L Glass amber (1 per EA )Learn Morewas $104.00 Special Price $77.76
- Sulfuric Acid, 1.1 N, 1.00 L Poly naturalSKU: CS103600-1A-EAManufacturer: Reagents IncSulfuric Acid, 1.1 N, 1.00 L Poly natural (1 per EA )Learn Morewas $46.50 Special Price $34.56
- Phenolphthalein, 0.0074% /IPA, 4.00 L Poly naturalSKU: C7270190-4A-EAManufacturer: Reagents IncPhenolphthalein, 0.0074% /IPA, 4.00 L Poly natural (1 per EA )Learn Morewas $119.00 Special Price $89.64
- Sodium Thiosulfate, 0.008N, 500.00 mL Poly naturalSKU: CS002600-500A-EAManufacturer: Reagents IncSodium Thiosulfate, 0.008N, 500.00 mL Poly natural (1 per EA )Learn Morewas $32.50 Special Price $24.84
- Ferric Chloride, 25% w/v, 10.00 L CubitainerSKU: CF001700-10F-EAManufacturer: Reagents IncFerric Chloride, 25% w/v, 10.00 L Cubitainer (1 per EA )Learn Morewas $275.00 Special Price $206.28
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