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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Ammonium Hydroxide, 1.0N (1.0M), 4L, Poly BottleSKU: LC110804-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $180.00 Special Price $135.00 -
Potassium Thiocyanate, 0.1 N Aqueous Solution, 500mL, CAS# 333-20-0SKU: P-480-500ML-EAManufacturer: Spectrum ChemicalPotassium Thiocyanate, 0.1 N 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 $53.15 Special Price $43.24 -
Lead Nitrate Stock, 100 ppm Pb, 1.00 L Glass amberSKU: CL170000-1C-EAManufacturer: Reagents IncLead Nitrate Stock, 100 ppm Pb, 1.00 L Glass amber (1 per EA )Learn Morewas $119.00 Special Price $89.64 - Sodium Thiosulfate 0.1 N, 1.00 L Poly naturalSKU: C7328100-1A-EAManufacturer: Reagents IncSodium Thiosulfate 0.1 N, 1.00 L Poly natural (1 per EA )Learn Morewas $32.50 Special Price $24.84
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Nitric acid, Diluted - 100mLSKU: TS14417-100ml-EAManufacturer: Dawn ScientificNitric acid, Diluted - 100mL (1 per EA )Learn Morewas $69.62 Special Price $67.88 - Citric Acid, 10% w/v, 1.00 L Poly naturalSKU: CC204100-1A-EAManufacturer: Reagents IncCitric Acid, 10% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $89.00 Special Price $66.96
- Ammonium Thiocyanate, 0.5 N, 1.00 L Poly naturalSKU: CA014900-1A-EAManufacturer: Reagents IncAmmonium Thiocyanate, 0.5 N, 1.00 L Poly natural (1 per EA )Learn Morewas $54.00 Special Price $41.04
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Vario Oxyscav 1 Reagent 100 Pack, Ea/1SKU: 531400-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2167969. (1 per EA )Learn More$55.33 -
Potassium Permanganate 4% W/V, 500ML, Amber GlassSKU: LC199301-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $54.70 Special Price $41.03 -
Potassium Hydroxide, 1.0 N Aqueous Solution, 1L, CAS# 1310-58-3SKU: P-360-1LT-EAManufacturer: Spectrum ChemicalPotassium Hydroxide, 1.0 N 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 $84.95 Special Price $69.12 - Barium Nitrate TS - 100mLSKU: TS14051-100ml-EAManufacturer: Dawn ScientificBarium Nitrate TS - 100mL (1 per EA )Learn Morewas $44.62 Special Price $43.50
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Benedict Qualitative Solution, 500ML, Poly BottleSKU: LC116501-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $40.60 Special Price $30.45 -
Ferrous Ammonium Sulfate, 0.05M (0.05N), 1L, Amber GlassSKU: LC144802-EAManufacturer: LabChemShelf Life (months): 3, Traceable to NIST, UN Number: UN3264 (1 per EA)Learn Morewas $107.00 Special Price $80.25 - Oxalic Acid Dihydrate Purified, 50.00 K Drum, FiberSKU: C2110500-50F4-EAManufacturer: Reagents IncOxalic Acid Dihydrate Purified, 50.00 K Drum, Fiber (1 per EA )Learn Morewas $882.00 Special Price $662.04
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Sodium Hydroxide, 10.0 N Aqueous Solution, APHA, 1L, CAS# 1310-73-2SKU: S-395-1LT-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 10.0 N Aqueous Solution, 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 $98.45 Special Price $80.11 - Potassium Hydroxide 30% W/V, 500ML, Poly BottleSKU: LC192401-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1814 (1 per EA)Learn Morewas $42.40 Special Price $31.80
- Acetic Acid Glacial, Purified, 20.00 L Winpak blueSKU: C5100500-20E7-EAManufacturer: Reagents IncAcetic Acid Glacial, Purified, 20.00 L Winpak blue (1 per EA )Learn Morewas $480.00 Special Price $359.64
- Sodium Carbonate, 1.5 M / 3 N, 4.00 L Poly naturalSKU: CS121400-4A-EAManufacturer: Reagents IncSodium Carbonate, 1.5 M / 3 N, 4.00 L Poly natural (1 per EA )Learn Morewas $227.00 Special Price $170.64
- Sulfuric Acid, 32% w/v, 4.00 L Poly naturalSKU: CS302400-4A-EAManufacturer: Reagents IncSulfuric Acid, 32% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $185.00 Special Price $138.24
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Eriochrome Black TS, (U.S.P. Test Solution), 100mL, CAS# 760-21-4SKU: E-148-100ML-EAManufacturer: Spectrum ChemicalEriochrome Black 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 $265.00 Special Price $254.84 - Perchloric Acid, 0.3 N / GAA, 4.00 L Glass amberSKU: CP120000-4C-EAManufacturer: Reagents IncPerchloric Acid, 0.3 N / GAA, 4.00 L Glass amber (1 per EA )Learn Morewas $363.00 Special Price $272.16
- Potassium Ferricyanide TS - 500mLSKU: TS14217-500ml-EAManufacturer: Dawn ScientificPotassium Ferricyanide TS - 500mL (1 per EA )Learn Morewas $89.62 Special Price $87.38
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Chromate Indicator, 16 ozSKU: R-0630-E-EAManufacturer: Taylor TechnologiesChromate Indicator, 16 oz (1 per EA)Learn Morewas $25.02 Special Price $19.11 -
Tube Test Lead 25 Tests, Ea/1SKU: 420754-EAManufacturer: Lovibond Tintometer GroupLovibond® Lead Reagent Set, 25 Tests (1 per EA)Learn More$288.30
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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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