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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Vario Hexamine Reagent, F20 100 Pack, Ea/1SKU: 531650-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2603999. (1 per EA )Learn More$86.63 -
Alcoholic Mercuric Bromide TS - 500mLSKU: TS14014-500ml-EAManufacturer: Dawn ScientificAlcoholic Mercuric Bromide TS - 500mL (1 per EA )Learn Morewas $119.62 Special Price $116.63 -
Ammonium Hydroxide, 50% v/v Solution, 1 LSKU: A1032-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAqueous Ammonia (1 per EA)Learn More$29.05 -
Isopropyl Alcohol, 70% v/v Technical, 55 gal, Metal Drum CAS# 67-63-0SKU: I1001-55gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsIsopropanol; 2-propanol **DRUM CLEANOUT FEE** **DRUM DEPOSIT** (1 per EA)Learn More$601.05 - Zinc Sulfate, 0.1 Molar, 1 L, PolySKU: Z1017-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsZinc Sulfate, 0.1 Molar, 1 L, Poly (1 per EA )Learn More$39.90
- Iodobromide TS - 100mLSKU: TS14137-100ml-EAManufacturer: Dawn ScientificIodobromide TS - 100mL (1 per EA )Learn Morewas $119.62 Special Price $116.63
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Silver Nitrate N/35.5, 32 ozSKU: R-0629-35-F-EAManufacturer: Taylor TechnologiesSilver Nitrate N/35.5, 32 oz (1 per EA)Learn Morewas $53.81 Special Price $41.11 - Biuret Reagent, 500 mLSKU: B1033-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsQualitative for Detection of Protein (1 per EA)Learn More$19.75
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Ammonium Molybdate Reagent 2, 500ML, Poly BottleSKU: LC112401-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: UN2796 (1 per EA)Learn Morewas $105.90 Special Price $79.42 -
Af 329, Hazen Set-Up 0-250 Pt. Co. Units , Ea/1SKU: 433290-EAManufacturer: Lovibond Tintometer GroupLovibond® AF 329, Hazen Set-up, 0-250 Pt. Co. Units The Lovibond® AF329 is a special kit for visual colour grading using Platinum-Cobalt/Hazen/APHA Colour over the range 0 - 250 mg Pt/l. It is typically used for light yellow liquids such as water, oils a (1 per EA)Learn More$4,853.40 -
Sodium Carbonate .24N, 2 oz, Dropper BottleSKU: R-0810-C-EAManufacturer: Taylor TechnologiesSodium Carbonate .24N, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $13.92 Special Price $10.64 - Hydrogen Peroxide, 34% w/w, TechnicalSKU: H1027-50gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAssay: ˜34% w/w (1 per EA)Learn More$452.45
- Sulfuric Acid, 5% v/v Solution, 3.8 LSKU: S1116-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSulfuric Acid, 5% v/v Solution, 3.8 L (1 per EA)Learn More$34.75
- Potassium Iodide, 50% w/v Solution, 1 L, Amber PolySKU: P1090-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotide (1 per EA)Learn More$163.40
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Sulfuric Acid N/50, gal, 4-packSKU: R-0627S-50-G-4-PKManufacturer: Taylor TechnologiesSulfuric Acid N/50, gal, 4-pack (4 per PK)Learn Morewas $178.63 Special Price $136.46 -
TISAB II, for Fluoride ISE, 1.00 L Poly naturalSKU: C7340210-1A-EAManufacturer: Reagents IncTISAB II, for Fluoride ISE, 1.00 L Poly natural (1 per EA )Learn Morewas $67.00 Special Price $50.76 - Villella's Etch Super /EtOH, 2.50 L Glass scSKU: CV200300-2.5D-EAManufacturer: Reagents IncVillella's Etch Super /EtOH, 2.50 L Glass sc (1 per EA )Learn Morewas $363.00 Special Price $279.26
- Tannic Acid, 100.00 g Glass amb wmSKU: C2116000-100C2-EAManufacturer: Reagents IncTannic Acid, 100.00 g Glass amb wm (1 per EA )Learn Morewas $74.50 Special Price $56.16
- Adler's Reagent (Etchant), 500.00 mL Amber polySKU: CA009700-500B-EAManufacturer: Reagents IncAdler's Reagent (Etchant), 500.00 mL Amber poly (1 per EA )Learn Morewas $358.00 Special Price $268.92
- Sodium Hydroxide 1% W/V, 500ML, Poly BottleSKU: LC240001-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $29.00 Special Price $22.31
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Potassium Chloride, 0.01 N Solution, For Conductivity, APHA, 1L, CAS# 7447-40-7SKU: P-240-1LT-EAManufacturer: Spectrum ChemicalPotassium Chloride, 0.01 N Solution, For Conductivity, APHA - As an APHA certified solution, this item meets the ASTM D1209 standards for use in water and waste water treatment facilities to determine the concentration of dissolved and particulate materials. Spectrum Chemical manufactured APHA grade products meet the toughest regulatory standards for quality and purity. (1 per EA )Learn Morewas $136.95 Special Price $111.43 -
Formaldehyde, 37 Percent, USP, 500mL, CAS# 50-00-0SKU: FO110-500MLGL-EAManufacturer: Spectrum ChemicalFormaldehyde, 37 Percent, USP. All Spectrum Chemical USP grade products are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP). (1 per EA )Learn Morewas $113.40 Special Price $83.88 -
Demineralizer Bottle, 8 ozSKU: R-0804-DD-EAManufacturer: Taylor TechnologiesDemineralizer Bottle, 8 oz (1 per EA)Learn Morewas $46.33 Special Price $35.39 -
FAS-DPD Titrating Reagent (for bromine), 2 oz, Dropper BottleSKU: R-0872-C-EAManufacturer: Taylor TechnologiesFAS-DPD Titrating Reagent (for bromine), 2 oz, Dropper Bottle (1 per EA)Learn Morewas $22.59 Special Price $17.25
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