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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Sodium Hydrosulfite, 12% w/w, 200.00 L DrumSKU: CS008300-200E-EAManufacturer: Reagents IncSodium Hydrosulfite, 12% w/w, 200.00 L Drum (1 per EA )Learn Morewas $879.00 Special Price $658.80 - Ferric Ion Solution 30, 1.00 L Poly naturalSKU: CF128300-1A-EAManufacturer: Reagents IncFerric Ion Solution 30, 1.00 L Poly natural (1 per EA )Learn Morewas $143.00 Special Price $106.92
- Triton X-100™, 2% v/v, 500.00 mL Poly naturalSKU: CT104200-500A-EAManufacturer: Reagents IncTriton X-100™, 2% v/v, 500.00 mL Poly natural (1 per EA )Learn Morewas $85.00 Special Price $65.39
- Phosphate Buffer, pH 6.8 USP, 20.00 L CubitainerSKU: CP235000-20F-EAManufacturer: Reagents IncPhosphate Buffer, pH 6.8 USP, 20.00 L Cubitainer (1 per EA )Learn Morewas $251.00 Special Price $187.92
- Villella's Reagent, 1.9% /EtOH, 2.50 L Glass scSKU: CV000200-2.5D-EAManufacturer: Reagents IncVillella's Reagent, 1.9% /EtOH, 2.50 L Glass sc (1 per EA )Learn Morewas $628.00 Special Price $483.13
- Sodium Citrate, 40% w/v, 4.00 L Poly naturalSKU: C73145TX-4A-EAManufacturer: Reagents IncSodium Citrate, 40% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $130.00 Special Price $97.20
- TISAB III, with CDTA, 1.00 L Poly naturalSKU: CT131500-1A-EAManufacturer: Reagents IncTISAB III, with CDTA, 1.00 L Poly natural (1 per EA )Learn Morewas $192.00 Special Price $147.71
- Sodium Nitrate, 10% w/v, 1.00 L Poly naturalSKU: CS183400-1A-EAManufacturer: Reagents IncSodium Nitrate, 10% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $149.00 Special Price $111.24
- Sodium Hydroxide, 1.6 M (1.6N), 4.00 L Poly naturalSKU: CS131000-4A-EAManufacturer: Reagents IncSodium Hydroxide, 1.6 M (1.6N), 4.00 L Poly natural (1 per EA )Learn Morewas $97.00 Special Price $72.36
- Acetic Acid/Water Std 90/10, 20.00 L CubitainerSKU: CA012200-20F-EAManufacturer: Reagents IncAcetic Acid/Water Std 90/10, 20.00 L Cubitainer (1 per EA )Learn Morewas $665.00 Special Price $511.60
- Total Alkalinity Indicator, 500.00 mL Glass amberSKU: CT144100-500C-EAManufacturer: Reagents IncTotal Alkalinity Indicator, 500.00 mL Glass amber (1 per EA )Learn Morewas $52.50 Special Price $40.39
- Sodium Hydroxide, 0.1562 N, 4.00 L Poly naturalSKU: CS135800-4A-EAManufacturer: Reagents IncSodium Hydroxide, 0.1562 N, 4.00 L Poly natural (1 per EA )Learn Morewas $102.00 Special Price $76.68
- Barium Chloride, 20% w/v, 4.00 L Poly naturalSKU: CB100500-4A-EAManufacturer: Reagents IncBarium Chloride, 20% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $160.00 Special Price $119.88
- Chromic Acid, 5% w/v, 20.00 L Winpak blueSKU: CC119500-20E7-EAManufacturer: Reagents IncChromic Acid, 5% w/v, 20.00 L Winpak blue (1 per EA )Learn Morewas $573.00 Special Price $429.84
- Phosphoric Acid CP 85% w/w, 500.00 mL Glass amberSKU: C5102000-500C-EAManufacturer: Reagents IncPhosphoric Acid CP 85% w/w, 500.00 mL Glass amber (1 per EA )Learn Morewas $60.50 Special Price $45.36
- 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
- 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
- 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
- Alkaline Oleic Acid Solution, 10.00 L CubitainerSKU: CA208400-10F-EAManufacturer: Reagents IncAlkaline Oleic Acid Solution, 10.00 L Cubitainer (1 per EA )Learn Morewas $340.00 Special Price $254.88
- Sulfuric Acid 70% w/w Textile, 1.00 L Poly naturalSKU: C7306600-1A-EAManufacturer: Reagents IncSulfuric Acid 70% w/w Textile, 1.00 L Poly natural (1 per EA )Learn Morewas $42.00 Special Price $31.32
- Manufacturer Reagents Inc Remove This Item
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