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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Acetate Buffer, pH 6.0, For Aluminum, 500ML, Poly BottleSKU: LC100701-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $73.90 Special Price $55.43 - Ammonium Sulfate 10% W/V, 500ML, Poly BottleSKU: LC113001-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $89.00 Special Price $66.75
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Choline Hydroxide Solution, 45 Percent Aqueous, 100mL, CAS# 156-57-0SKU: C2744-100ML-EAManufacturer: Spectrum ChemicalCholine Hydroxide Solution, 45 Percent Aqueous, also known as Bilineurine, is a water-soluble essential nutrient used as a precursor molecule for the neurotransmitter acetylcholine; it is involved in several functions including muscle and memory muscle control. 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$230.90 -
Zinc Acetate, 0.1 M, 10.00 L CubitainerSKU: CZ127000-10F-EAManufacturer: Reagents IncZinc Acetate, 0.1 M, 10.00 L Cubitainer (1 per EA )Learn Morewas $186.00 Special Price $143.10 -
Iodine, D'Antoni, 1L, Amber GlassSKU: LC156742-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $133.90 Special Price $100.43 -
Ammonium Molybdate Reagent 1, 1L, Poly BottleSKU: LC112302-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: UN2796 (1 per EA)Learn Morewas $115.00 Special Price $86.25 -
Buffer Solution, Acetate, pH 4.0, For Residual Chlorine, APHASKU: B-195-500ML-EAManufacturer: Spectrum ChemicalBuffer Solution, Acetate, pH 4.0, For Residual Chlorine, APHA is a mixture of acid and its conjugate base in order to prevent changes in the pH of a solution. These solutions are mainly utilized to keep pH at a constant value in a variety of chemical applications. As an APHA certified solution, this item is meets the ASTM D1209 standards and can be used in water and waste water treatment facilities to determine the concentration of residual chlorine. Spectrum Chemical manufactured APHA grade products meet the toughest regulatory standards for quality and purity. (1 per EA )Learn Morewas $97.30 Special Price $79.16 - Alkaline-Iodide-Azide, Alsterb, 4.00 L Poly naturalSKU: CA013600-4A-EAManufacturer: Reagents IncAlkaline-Iodide-Azide, Alsterb, 4.00 L Poly natural (1 per EA )Learn Morewas $322.00 Special Price $247.72
- Thymolphthalein, 0.2% in MeOH, 1.00 L Glass amberSKU: CT119200-1C-EAManufacturer: Reagents IncThymolphthalein, 0.2% in MeOH, 1.00 L Glass amber (1 per EA )Learn Morewas $102.00 Special Price $78.47
- Lead Perchlorate, 0.05 M, 4.00 L Glass amberSKU: CL172700-4C-EAManufacturer: Reagents IncLead Perchlorate, 0.05 M, 4.00 L Glass amber (1 per EA )Learn Morewas $949.00 Special Price $711.72
- Xylenes/Ethanol, 50:50, 4.00 L Glass amberSKU: CX195000-4C-EAManufacturer: Reagents IncXylenes/Ethanol, 50:50, 4.00 L Glass amber (1 per EA )Learn Morewas $295.00 Special Price $226.94
- Thymolphthalein, 0.1% /EtOH, 120.00 mL Poly naturalSKU: CT119500-120A-EAManufacturer: Reagents IncThymolphthalein, 0.1% /EtOH, 120.00 mL Poly natural (1 per EA )Learn Morewas $68.00 Special Price $52.32
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Ferric Subsulfate Solution, USP, 200L, CAS# 1310-45-8SKU: F1305-200LTBL-EAManufacturer: Spectrum ChemicalFerric Subsulfate Solution, USP. All Spectrum Chemical USP grade products are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP). (1 per EA )Learn More$7,626.05 -
Acetic Acid 20% V/V (1+4), 20L, Cubitainer®SKU: LC102105-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2790 (1 per EA)Learn Morewas $411.70 Special Price $308.77 -
Cobaltous Chloride TS, (U.S.P. Test Solution), 100mL, CAS# 58537-94-3SKU: C-289-100ML-EAManufacturer: Spectrum ChemicalCobaltous Chloride 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 $369.60 Special Price $355.43 -
Nitrate/Nitrate-N Tube Test 340 Nm / 0,5 - 14 Mg/L N, Ea/1SKU: 2420702-EAManufacturer: Lovibond Tintometer GroupLovibond® Nitrate / Nitrate-N Tube Test, 24 Tests Includes: Nitrate Tube Tests - 24 ct. Calibration Tube - 2 ct. Nitrate-111 Solution - 7ml (1 per EA)Learn More$167.30 - Citric Acid, 1.0M (3.0N), 500ML, Poly BottleSKU: LC131801-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $74.40 Special Price $55.80
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Mcilvaine'S Buffer pH 3.2, 10L, Cubitainer®SKU: LC163006-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $203.90 Special Price $152.93 - Buffer, pHospHate pH 7.0, 500ML, Poly BottleSKU: LC185201-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $79.80 Special Price $59.85
- Buffer Solution, (Giordano) pH 6.4, 500ML, Poly BottleSKU: LC125901-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $36.20 Special Price $27.15
- Citric Acid Anhydrous Purified, 3.00 K Poly naturalSKU: C2104550-3A5-EAManufacturer: Reagents IncCitric Acid Anhydrous Purified, 3.00 K Poly natural (1 per EA )Learn Morewas $215.00 Special Price $160.92
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Sodium Hydroxide, 2.5N (2.5M), 4L, Poly BottleSKU: LC244004-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $126.80 Special Price $97.55 -
Total Chelant Titrating Solution, 2 oz, Dropper BottleSKU: R-0912-C-EAManufacturer: Taylor TechnologiesTotal Chelant Titrating Solution, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $37.86 Special Price $28.92 - Sodium Hydroxide 20% W/V, 1L, Poly BottleSKU: LC240902-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $56.20 Special Price $43.23
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LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
BEAD BATH 20 L, 120 V, TYPE B PLUG, Liters/EA: 20
was $1,794.65 Special Price $1,714.78
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