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 Bromide, 10% w/v, 10.00 L CubitainerSKU: CS004500-10F-EAManufacturer: Reagents IncSodium Bromide, 10% w/v, 10.00 L Cubitainer (1 per EA )Learn Morewas $177.00 Special Price $132.84 - Methanol / Ether Blend 50% v/v, 4.00 L Glass amberSKU: CM010400-4C-EAManufacturer: Reagents IncMethanol / Ether Blend 50% v/v, 4.00 L Glass amber (1 per EA )Learn Morewas $394.00 Special Price $295.92
- Sulfuric Acid, 8 N, 20.00 L Winpak blueSKU: CS134400-20E7-EAManufacturer: Reagents IncSulfuric Acid, 8 N, 20.00 L Winpak blue (1 per EA )Learn Morewas $301.00 Special Price $225.72
- Sulfuric Acid, 50% v/v, 10.00 L CubitainerSKU: C7306200-10F-EAManufacturer: Reagents IncSulfuric Acid, 50% v/v, 10.00 L Cubitainer (1 per EA )Learn Morewas $191.00 Special Price $143.64
- Indicator A, 4.00 L Poly naturalSKU: C84030NE-4A-EAManufacturer: Reagents IncIndicator A, 4.00 L Poly natural (1 per EA )Learn Morewas $285.00 Special Price $213.84
- Phosphate Buffer,0.05 M,pH 7.4, 20.00 L CubitainerSKU: CP209500-20F-EAManufacturer: Reagents IncPhosphate Buffer,0.05 M,pH 7.4, 20.00 L Cubitainer (1 per EA )Learn Morewas $315.00 Special Price $242.33
- Weck's Reagent for alpha Ti, 500.00 mL Poly naturalSKU: CW000400-500A-EAManufacturer: Reagents IncWeck's Reagent for alpha Ti, 500.00 mL Poly natural (1 per EA )Learn Morewas $145.00 Special Price $111.56
- Universal Indicator, 500.00 mL Poly naturalSKU: C6126000-500A-EAManufacturer: Reagents IncUniversal Indicator, 500.00 mL Poly natural (1 per EA )Learn Morewas $101.00 Special Price $75.60
- Chromic Acid, 30% w/w, 1.00 L Poly naturalSKU: CC241000-1A-EAManufacturer: Reagents IncChromic Acid, 30% w/w, 1.00 L Poly natural (1 per EA )Learn Morewas $267.00 Special Price $199.80
- Sodium Hydroxide, 25% w/v, 4.00 L Poly naturalSKU: C7550X00-4A-EAManufacturer: Reagents IncSodium Hydroxide, 25% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $98.00 Special Price $73.44
- Borate Buffer, pH 9.5, 20.00 L CubitainerSKU: CB009500-20F-EAManufacturer: Reagents IncBorate Buffer, pH 9.5, 20.00 L Cubitainer (1 per EA )Learn Morewas $776.00 Special Price $582.12
- MEK/Toluene 60:40 w/w, 1.00 gal Metal CanSKU: CT144200-4E4-EAManufacturer: Reagents IncMEK/Toluene 60:40 w/w, 1.00 gal Metal Can (1 per EA )Learn Morewas $155.00 Special Price $119.24
- TISAB IV, for Fluoride ISE, 4.00 L Poly naturalSKU: CT130000-4A-EAManufacturer: Reagents IncTISAB IV, for Fluoride ISE, 4.00 L Poly natural (1 per EA )Learn Morewas $772.00 Special Price $593.91
- TISAB IV, for Fluoride ISE, 1.00 L Poly naturalSKU: CT130000-1A-EAManufacturer: Reagents IncTISAB IV, for Fluoride ISE, 1.00 L Poly natural (1 per EA )Learn Morewas $342.00 Special Price $263.11
- Toluene/Ethanol 12A, 80:20 w/w, 20.00 L Met Can RndSKU: CT143000-20E6-EAManufacturer: Reagents IncToluene/Ethanol 12A, 80:20 w/w, 20.00 L Met Can Rnd (1 per EA )Learn Morewas $573.00 Special Price $440.82
- Villella's Reagent, 1.9% /EtOH, 100.00 mL Glass amberSKU: CV000200-100C-EAManufacturer: Reagents IncVillella's Reagent, 1.9% /EtOH, 100.00 mL Glass amber (1 per EA )Learn Morewas $72.00 Special Price $55.40
- Potassium Dichromate solution, 500.00 mL Glass amberSKU: CP202000-500C-EAManufacturer: Reagents IncPotassium Dichromate solution, 500.00 mL Glass amber (1 per EA )Learn Morewas $171.00 Special Price $128.52
- Xylene/Toluene, 70/30 w/w, 4.00 L Glass amberSKU: CX000100-4C-EAManufacturer: Reagents IncXylene/Toluene, 70/30 w/w, 4.00 L Glass amber (1 per EA )Learn Morewas $274.00 Special Price $210.79
- Isopropyl Alcohol/Acetic Acid, 500.00 mL Poly naturalSKU: CI171900-500A-EAManufacturer: Reagents IncIsopropyl Alcohol/Acetic Acid, 500.00 mL Poly natural (1 per EA )Learn Morewas $36.00 Special Price $27.00
- Acetone, 10% v/v Aqueous, 4.00 L Poly naturalSKU: CA024100-4A-EAManufacturer: Reagents IncAcetone, 10% v/v Aqueous, 4.00 L Poly natural (1 per EA )Learn Morewas $111.00 Special Price $83.16
- Alkaline-Iodide-Azide, Alsterb, 500.00 mL Poly naturalSKU: CA013600-500A-EAManufacturer: Reagents IncAlkaline-Iodide-Azide, Alsterb, 500.00 mL Poly natural (1 per EA )Learn Morewas $75.50 Special Price $58.08
- Tannic Acid, 25% w/v, 4.00 L Glass amberSKU: CT100100-4C-EAManufacturer: Reagents IncTannic Acid, 25% w/v, 4.00 L Glass amber (1 per EA )Learn Morewas $335.00 Special Price $257.72
- Phosphate Buffer,0.05 M,pH 7.4, 20.00 L Winpak blueSKU: CP209500-20E7-EAManufacturer: Reagents IncPhosphate Buffer,0.05 M,pH 7.4, 20.00 L Winpak blue (1 per EA )Learn Morewas $323.00 Special Price $248.49
- Villella's Etch, 1% / Ethanol, 2.50 L Glass scSKU: CV200200-2.5D-EAManufacturer: Reagents IncVillella's Etch, 1% / Ethanol, 2.50 L Glass sc (1 per EA )Learn Morewas $355.00 Special Price $273.11
- Manufacturer Reagents Inc Remove This Item
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