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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Zinc Sulfate,12.5% w/v, pH 3.8, 4.00 L Poly naturalSKU: CZ133000-4A-EAManufacturer: Reagents IncZinc Sulfate,12.5% w/v, pH 3.8, 4.00 L Poly natural (1 per EA )Learn Morewas $309.00 Special Price $237.71 - Buffer Solution for Zinc, 1.00 L Amber polySKU: CZ000900-1B-EAManufacturer: Reagents IncBuffer Solution for Zinc, 1.00 L Amber poly (1 per EA )Learn Morewas $57.00 Special Price $43.85
- DAM Reagent (Test Solution B), 200.00 mL Poly naturalSKU: CT113100-200A-EAManufacturer: Reagents IncDAM Reagent (Test Solution B), 200.00 mL Poly natural (1 per EA )Learn Morewas $270.00 Special Price $207.71
- Tetraethylamm Bromide in GAA, 500.00 mL Glass amberSKU: CT006600-500C-EAManufacturer: Reagents IncTetraethylamm Bromide in GAA, 500.00 mL Glass amber (1 per EA )Learn Morewas $162.00 Special Price $124.63
- Alkaline-Iodide-Azide, Alsterb, 1.00 L Poly naturalSKU: CA013600-1A-EAManufacturer: Reagents IncAlkaline-Iodide-Azide, Alsterb, 1.00 L Poly natural (1 per EA )Learn Morewas $113.00 Special Price $86.94
- Thymolphthalein, 0.2% in IPA, 500.00 mL Poly naturalSKU: CT252500-500A-EAManufacturer: Reagents IncThymolphthalein, 0.2% in IPA, 500.00 mL Poly natural (1 per EA )Learn Morewas $77.50 Special Price $59.62
- Titration Solvent for Neut No, 4.00 L Glass amberSKU: CT125000-4C-EAManufacturer: Reagents IncTitration Solvent for Neut No, 4.00 L Glass amber (1 per EA )Learn Morewas $177.00 Special Price $136.17
- Water Hardness Indicator, Mod, 120.00 mL Glass amberSKU: CW200600-120C-EAManufacturer: Reagents IncWater Hardness Indicator, Mod, 120.00 mL Glass amber (1 per EA )Learn Morewas $44.50 Special Price $34.24
- n-Heptane/Toluene, 90/10 v/v, 4.00 L Glass amberSKU: CH004000-4C-EAManufacturer: Reagents Incn-Heptane/Toluene, 90/10 v/v, 4.00 L Glass amber (1 per EA )Learn Morewas $215.00 Special Price $160.92
- Urea/Phosphoric/Dichromate Sol, 1.00 L Poly naturalSKU: CU000500-1A-EAManufacturer: Reagents IncUrea/Phosphoric/Dichromate Sol, 1.00 L Poly natural (1 per EA )Learn Morewas $48.00 Special Price $36.93
- Acid Reagent (Test Solution A), 800.00 mL Poly naturalSKU: CT112000-800A-EAManufacturer: Reagents IncAcid Reagent (Test Solution A), 800.00 mL Poly natural (1 per EA )Learn Morewas $415.00 Special Price $319.27
- Water Hardness Titrating Soln, 1.00 L Poly naturalSKU: CW000900-1A-EAManufacturer: Reagents IncWater Hardness Titrating Soln, 1.00 L Poly natural (1 per EA )Learn Morewas $34.00 Special Price $26.16
- PAN Reagent, with Surfactant, 4.00 L Glass amberSKU: CP300300-4C-EAManufacturer: Reagents IncPAN Reagent, with Surfactant, 4.00 L Glass amber (1 per EA )Learn Morewas $490.00 Special Price $376.97
- Phosphoric Acid, 70% w/w, 500.00 mL Poly naturalSKU: CP223800-500A-EAManufacturer: Reagents IncPhosphoric Acid, 70% w/w, 500.00 mL Poly natural (1 per EA )Learn Morewas $134.00 Special Price $100.44
- Zinc Chloride, 0.100 Molar, 4.00 L Poly naturalSKU: CZ129000-4A-EAManufacturer: Reagents IncZinc Chloride, 0.100 Molar, 4.00 L Poly natural (1 per EA )Learn Morewas $192.00 Special Price $147.71
- Triethanolamine, 50% v/v, 1.00 L Glass amberSKU: CT153000-1C-EAManufacturer: Reagents IncTriethanolamine, 50% v/v, 1.00 L Glass amber (1 per EA )Learn Morewas $209.00 Special Price $160.79
- Zinc Acetate, 2 N APHA, 500.00 mL Poly naturalSKU: CZ111500-500A-EAManufacturer: Reagents IncZinc Acetate, 2 N APHA, 500.00 mL Poly natural (1 per EA )Learn Morewas $75.00 Special Price $57.70
- Water Hardness Titrating Soln, 20.00 L CubitainerSKU: CW000900-20F-EAManufacturer: Reagents IncWater Hardness Titrating Soln, 20.00 L Cubitainer (1 per EA )Learn Morewas $200.00 Special Price $153.87
- Villella's Etch, 1% / Ethanol, 1.00 L Glass amberSKU: CV200200-1C-EAManufacturer: Reagents IncVillella's Etch, 1% / Ethanol, 1.00 L Glass amber (1 per EA )Learn Morewas $193.00 Special Price $148.48
- Phosphate Buffer, pH 7 (Amp), 4.00 L Poly naturalSKU: CP004000-4A-EAManufacturer: Reagents IncPhosphate Buffer, pH 7 (Amp), 4.00 L Poly natural (1 per EA )Learn Morewas $378.00 Special Price $290.80
- Water Hardness Buffer w/o Mg, 1.00 L Poly naturalSKU: CW000700-1A-EAManufacturer: Reagents IncWater Hardness Buffer w/o Mg, 1.00 L Poly natural (1 per EA )Learn Morewas $58.00 Special Price $44.62
- Water Hardness Buffer, 1.00 L Poly naturalSKU: CW000600-1A-EAManufacturer: Reagents IncWater Hardness Buffer, 1.00 L Poly natural (1 per EA )Learn Morewas $73.50 Special Price $56.54
- Triethanolamine, 20% w/v, 500.00 mL Glass amberSKU: CT001800-500C-EAManufacturer: Reagents IncTriethanolamine, 20% w/v, 500.00 mL Glass amber (1 per EA )Learn Morewas $160.00 Special Price $123.09
- Zincon Color Reagent, 1.00 L Amber polySKU: CZ001000-1B-EAManufacturer: Reagents IncZincon Color Reagent, 1.00 L Amber poly (1 per EA )Learn Morewas $139.00 Special Price $106.94
- Manufacturer Reagents Inc Remove This Item
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