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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Potassium Permanganate, 1.0N (0.2M), 500ML, Amber GlassSKU: LC200501-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $42.10 Special Price $31.58 -
Nitric Acid, 10 Percent (w/v) Aqueous Solution, 1L, CAS# 6146-52-7SKU: N-165-1LT-EAManufacturer: Spectrum ChemicalNitric Acid, 10 Percent (w/v) Aqueous Solution - 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 $146.75 Special Price $119.40 -
Diethylenetriaminepentaacetic Acid, Pentasodium Salt, 41 Percent Solution in Water, CAS# 140-01-2SKU: D1156-500ML-EAManufacturer: Spectrum ChemicalDiethylenetriaminepentaacetic Acid, Pentasodium Salt, 41 Percent Solution in Water is also known under the abbreviation DETA and is a colorless liquid that is hygroscopic and soluble in both water and polar organic solvents. It is used as a tridentate ligand. 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 More$233.35 -
Sodium Hydroxide 50% W/V, 1L, Poly BottleSKU: LC241402-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $98.40 Special Price $75.70 -
Sulfuric Acid, 12% v/v Solution, 3.8 L, Poly GallonSKU: CF1110-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSulfuric Acid, 12% v/v Solution, 3.8 L, Poly Gallon (1 per EA )Learn More$55.65 -
Diluted Hydrochloric Acid, 10 Percent (w/v), NF, 2.5L, CAS# 7647-01-0SKU: HY105-2.5LTPV-CSManufacturer: Spectrum ChemicalDiluted Hydrochloric Acid, 10 Percent (w/v), NF is a pH acidifier excipient. All Spectrum Chemical NF grade products are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP). (4 per CS )Learn Morewas $1,070.75 Special Price $792.05 -
Ceric Ammonium Sulfate, 0.1N (0.1M), 1L, Amber GlassSKU: LC129302-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $79.10 Special Price $59.32 - Potassium Hydroxide, 10% w/v Solution, 500 mLSKU: P1043-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsCaustic Potash; Potassium Hydrate (1 per EA)Learn More$20.25
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Nessler's Reagent TS - 100mLSKU: TS14411-100ml-EAManufacturer: Dawn ScientificNessler's Reagent TS - 100mL (1 per EA )Learn Morewas $42.62 Special Price $41.56 -
Total pHospHate , Pmb, Tube Test 5,0-6,0/1,5-20 Mg/L, Ea/1SKU: 2420700-EAManufacturer: Lovibond Tintometer GroupLovibond® Phosphate, Total HR Tube Test, 24 Tests Includes: Reaction Tube, HR Phosphate-101 Calibration Tube - 2 ct. Phosphate-102 Solution Phosphate-103 Reagent (1 per EA)Learn More$172.80 -
Bleach Reagent #2 (crystals), 50 gSKU: R-0665S-II-EAManufacturer: Taylor TechnologiesBleach Reagent #2 (crystals), 50 g (1 per EA)Learn Morewas $30.71 Special Price $23.46 -
EDTA, 0.0575 Molar, 1 L, PolySKU: E1007-1L-EAManufacturer: 710 Spirits Rocky Mtn Reagents0.115 N; Ethylenediaminetetraacetic Acid, Disodium Salt, Dihydrate (1 per EA)Learn More$22.95 -
Hydrochloric Acid, 2.0N (2.0M), 500ML, Poly BottleSKU: LC153201-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1789 (1 per EA)Learn Morewas $49.00 Special Price $36.75 -
Hydrochloric Acid, 1 N, 20.00 L CubitainerSKU: C7101080-20F-EAManufacturer: Reagents IncHydrochloric Acid, 1 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $212.00 Special Price $158.76 -
Alkaline Iodide Azide-1, 1L, Amber PolySKU: LC106702-EAManufacturer: LabChemShelf Life (months): 36, , UN Number: UN1824 (1 per EA)Learn Morewas $168.10 Special Price $126.08 - Potassium Hydroxide, 2.0N (2.0M), 1L, Poly BottleSKU: LC193602-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1814 (1 per EA)Learn Morewas $59.30 Special Price $44.47
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PAA Reagent #1, 2 ozSKU: R-0925-C-EAManufacturer: Taylor TechnologiesPAA Reagent #1, 2 oz (1 per EA)Learn Morewas $17.45 Special Price $13.33 - Hydrogen Peroxide, 3% w/w Solution, 5 galSKU: H1020-5gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsHydrogen Peroxide, 3% w/w Solution, 5 gal (1 per EA)Learn More$102.75
- Sodium Silicate, 41° Baume, 10.00 L CubitainerSKU: C2324900-10F-EAManufacturer: Reagents IncSodium Silicate, 41° Baume, 10.00 L Cubitainer (1 per EA )Learn Morewas $200.00 Special Price $150.12
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Potassium Iodide TS, (U.S.P. Test Solution), 100mL, CAS# 7681-11-0SKU: P-231-100ML-EAManufacturer: Spectrum ChemicalPotassium Iodide TS, (U.S.P. Test Solution) is a ready-for-use solution for the purpose of conducting USP, National Formulary and assay tests and is prepared according to the specifications of the USP Pharmacopeial Convention. (1 per EA )Learn Morewas $352.40 Special Price $338.88 - Chloroform-Butanol Reagent, 1L, Amber GlassSKU: LC130502-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN2810 (1 per EA)Learn Morewas $256.40 Special Price $192.30
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Potassium Iodide 0.5% W/V, 125ML, White PolySKU: LC197007-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $31.40 Special Price $23.55 - Xylenol Orange, 0.1% w/v Solution, 120 mLSKU: X1001-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsXylenol Orange, 0.1% w/v Solution, 120 mL (1 per EA)Learn More$22.95
- P-Toluenesulfonic Acid TS - 100mLSKU: TS14298-100ml-EAManufacturer: Dawn ScientificP-Toluenesulfonic Acid TS - 100mL (1 per EA )Learn Morewas $39.62 Special Price $38.63
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LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
BEAD BATH 20 L, 120 V, TYPE B PLUG, Liters/EA: 20
was $1,794.65 Special Price $1,714.78
4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
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