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 Chloride, 10% w/v, 20.00 L CubitainerSKU: CA005200-20F-EAManufacturer: Reagents IncAmmonium Chloride, 10% w/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $348.00 Special Price $261.36 - Sodium Hydroxide, 0.4 N, 1.00 L Poly naturalSKU: CS160300-1A-EAManufacturer: Reagents IncSodium Hydroxide, 0.4 N, 1.00 L Poly natural (1 per EA )Learn Morewas $39.50 Special Price $29.16
- Amm Chloride/Hydroxide Buf 1M, 4.00 L Poly naturalSKU: CA100900-4A-EAManufacturer: Reagents IncAmm Chloride/Hydroxide Buf 1M, 4.00 L Poly natural (1 per EA )Learn Morewas $257.00 Special Price $192.24
- PetEther/Dichloromethane 80/20, 2.50 L Glass amberSKU: CP120800-2.5C-EAManufacturer: Reagents IncPetEther/Dichloromethane 80/20, 2.50 L Glass amber (1 per EA )Learn Morewas $498.00 Special Price $373.68
- Phenol/Methanol 80:20 W/W, 2.50 L EachSKU: CP610000-2.5Y-EAManufacturer: Reagents IncPhenol/Methanol 80:20 W/W, 2.50 L Each (1 per EA )Learn Morewas $470.00 Special Price $352.08
- Sodium Periodate 6% w/v, 4.00 L Black polySKU: CS042000-4BP-EAManufacturer: Reagents IncSodium Periodate 6% w/v, 4.00 L Black poly (1 per EA )Learn Morewas $2,140.00 Special Price $1,604.88
- Sodium Nitrite 0.1 M (0.2 N), 10.00 L CubitainerSKU: CS148600-10F-EAManufacturer: Reagents IncSodium Nitrite 0.1 M (0.2 N), 10.00 L Cubitainer (1 per EA )Learn Morewas $449.00 Special Price $336.96
- Trivalent Chromium 1.50 oz/gal, 100.00 mL Glass clearSKU: CT031500-100D1-EAManufacturer: Reagents IncTrivalent Chromium 1.50 oz/gal, 100.00 mL Glass clear (1 per EA )Learn Morewas $132.00 Special Price $101.55
- TISAB IV, for Fluoride ISE, 20.00 L CubitainerSKU: CT130000-20F-EAManufacturer: Reagents IncTISAB IV, for Fluoride ISE, 20.00 L Cubitainer (1 per EA )Learn Morewas $2,170.00 Special Price $1,669.41
- Trivalent Chromium 0.75 oz/gal, 100.00 mL Glass clearSKU: CT031200-100D1-EAManufacturer: Reagents IncTrivalent Chromium 0.75 oz/gal, 100.00 mL Glass clear (1 per EA )Learn Morewas $132.00 Special Price $101.55
- Trivalent Chromium 0.25 oz/gal, 100.00 mL Glass clearSKU: CT031000-100D1-EAManufacturer: Reagents IncTrivalent Chromium 0.25 oz/gal, 100.00 mL Glass clear (1 per EA )Learn Morewas $132.00 Special Price $101.55
- Tris, 0.1 M, in dil HCl, 4.00 L Poly naturalSKU: CT153300-4A-EAManufacturer: Reagents IncTris, 0.1 M, in dil HCl, 4.00 L Poly natural (1 per EA )Learn Morewas $156.00 Special Price $120.01
- Morpholine, 0.2 N, 4.00 L Glass amberSKU: CM136000-4C-EAManufacturer: Reagents IncMorpholine, 0.2 N, 4.00 L Glass amber (1 per EA )Learn Morewas $345.00 Special Price $265.41
- Zinc Sulfate, 9.5% with NH4OH, 1.00 L Poly naturalSKU: CZ132200-1A-EAManufacturer: Reagents IncZinc Sulfate, 9.5% with NH4OH, 1.00 L Poly natural (1 per EA )Learn Morewas $110.00 Special Price $84.62
- Zinc Sulfate, 10% w/v, 20.00 L CubitainerSKU: CZ132000-20F-EAManufacturer: Reagents IncZinc Sulfate, 10% w/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $720.00 Special Price $553.91
- Thioacetamide TS, 4% w/v, 1.00 L Glass amberSKU: CT010400-1C-EAManufacturer: Reagents IncThioacetamide TS, 4% w/v, 1.00 L Glass amber (1 per EA )Learn Morewas $230.00 Special Price $176.94
- Ammonium Chloride, 0.1 M, 4.00 L Poly naturalSKU: CA014700-4A-EAManufacturer: Reagents IncAmmonium Chloride, 0.1 M, 4.00 L Poly natural (1 per EA )Learn Morewas $200.00 Special Price $153.87
- Copper Sulfate, 0.2% w/v, 4.00 L Poly naturalSKU: CC201200-4A-EAManufacturer: Reagents IncCopper Sulfate, 0.2% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $96.50 Special Price $74.24
- Tridecane, 1% w/v in Pyridine, 4.00 L Glass amberSKU: CT147000-4C-EAManufacturer: Reagents IncTridecane, 1% w/v in Pyridine, 4.00 L Glass amber (1 per EA )Learn Morewas $835.00 Special Price $642.38
- THF / Propylene Glycol, 4:1, 4.00 L Glass amberSKU: CT100500-4C-EAManufacturer: Reagents IncTHF / Propylene Glycol, 4:1, 4.00 L Glass amber (1 per EA )Learn Morewas $4,190.00 Special Price $3,223.43
- Sodium Hydroxide, 3 M, Unstd, 20.00 L CubitainerSKU: CS130400-20F-EAManufacturer: Reagents IncSodium Hydroxide, 3 M, Unstd, 20.00 L Cubitainer (1 per EA )Learn Morewas $207.00 Special Price $159.25
- Sodium Chloride, 1 N, 20.00 L CubitainerSKU: CS142800-20F-EAManufacturer: Reagents IncSodium Chloride, 1 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $579.00 Special Price $445.44
- Tris, 0.6 M, 20.00 L CubitainerSKU: CT153500-20F-EAManufacturer: Reagents IncTris, 0.6 M, 20.00 L Cubitainer (1 per EA )Learn Morewas $845.00 Special Price $650.07
- Solution A for USP Testing of, 1.00 L Glass amberSKU: CA016600-1C-EAManufacturer: Reagents IncSolution A for USP Testing of, 1.00 L Glass amber (1 per EA )Learn Morewas $110.00 Special Price $84.62
- Manufacturer Reagents Inc Remove This Item
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